Technology choice

Using artificial intelligence in production and packaging lines; A step towards smart factories

How will artificial intelligence transform the manufacturing industry?

artificial intelligence (Artificial Intelligence یا AI) In recent years, it has become one of the most important transformational technologies in the manufacturing and packaging industries.. The introduction of artificial intelligence into production lines does not only mean the use of advanced software; Rather, this technology can be a way of monitoring, controlling, making decisions and even designing Industrial processes to change.

based systems artificial intelligence They are able to analyze a large amount of production data in a short time, identify hidden patterns and make appropriate suggestions or decisions based on the available information.. The result of this process can be increased productivity, reduced waste, better control quality, reducing stops production line And Optimizing energy consumption be.

 

Intelligent quality control using machine vision

One of the important applications of artificial intelligence in industry، Automatic quality control with machine vision (Machine Vision) is. High-speed industrial cameras record images of products, and artificial intelligence algorithms analyze these images to identify defects..

These systems can identify things such as scratches, cracks, changes in shape, appearance defects, mistakes in printing, problems in assembly, color changes and even problems related to packaging. The important advantage of this method is the possibility 100% product inspection It is fast and tireless. In Industries With mass production, such capability can play an important role in increasing accuracy Quality control And Reduce defective products Have.

 

Equipment failure prediction and intelligent maintenance

Another important application artificial intelligencePredictive maintenance and repairs (Predictive Maintenance) is. In traditional methods, the equipment is either serviced at specific time intervals or repaired after failure. But in an intelligent system, information from sensors such as temperature, vibration, pressure, electric current, rotational speed, and equipment load are collected continuously.. By analyzing this data, artificial intelligence algorithms can identify early signs of failure.

For example, an abnormal increase in the vibration of a motor or a change in the current consumption pattern can be a sign of bearing wear, imbalance, or a mechanical problem.. Identifying these signs before a complete failure allows planning repairs and preventing sudden stoppage of the production line..

 

Optimizing the performance of production lines with artificial intelligence

in one Industrial production line, several factors on the amount of production and Productivity They affect. Machine speed, product change time, short stops, amount of waste, Quality of raw materials And how to set the equipment are only part of these factors.

Artificial intelligence can analyze the data related to these parameters and Production bottlenecks (Bottlenecks) identify. Also, by comparing the performance of different lines and shifts, factors that reduce productivity can be better identified. In more advanced stages, artificial intelligence algorithms can also be used to choose the best operating settings; That is, the system should suggest the most appropriate combination of production parameters by examining past data and current conditions.

 

Reducing waste and consumption of raw materials

One of the important goals of using artificial intelligence in manufacturing industries is to reduce production waste. Even a few percent reduction in waste in a high-production plant can have a significant impact on bottom line costs.

artificial intelligence By examining the relationship between process parameters and product quality, it can help to identify factors that cause an increase in defective products or raw material waste. For example, in production processes where temperature, pressure, speed or the amount of raw materials play an important role, historical data analysis can help determine the optimal limits of equipment performance..

 

Application of artificial intelligence in packaging lines

Packaging industry It is also one of the fields that has a high capacity to use artificial intelligence. Smart systems can handle processes such as product recognition, package position control, printing and label checking, cap control, package tear or damage detection, and checking quality Manage the final packaging.

In high-speed packaging lines, the smallest error can cause the line to stop or produce a large number of defective products. The use of industrial cameras and artificial intelligence algorithms provides the possibility of quickly identifying the error and isolating the defective product. In this way, artificial intelligence In packaging It can increase the speed, accuracy and reliability of the process Quality control also increase.

 

artificial intelligence and industrial robots; Human-machine cooperation

Composition artificial intelligence with Industrial robots and Collaborative robots (Cobots) a new path in Industrial automation has created. Robots can perform repetitive, heavy or risky tasks, and artificial intelligence helps the system to better understand the environment and working conditions and make more accurate decisions..

For example, in packaging lines, robots equipped with machine vision can recognize products, select them according to shape or position, and place them in the right place. This combination can be one of the important components of movement. Industries towards Smart production And Smart factory (Smart Factory) knew.

 

Analysis of production data and intelligent decision making

Each production line generates a large amount of data; From the information about the speed and temperature of the machinery to the amount of production, stoppages, waste and status Product quality.If this data is only stored, it will be of limited value. artificial intelligence It can turn this information into actionable insights for managers and production experts.

For example, the system can determine under what conditions the amount waste increases, which equipment has the most downtime, when a piece of equipment is most likely to fail, or which settings provide the most efficiency.

One of the most important infrastructures required for the effective use of artificial intelligence in the factory Industrial Internet of Things (IIoT) is. Sensors and connected equipment collect real data from machinery and the production process, and this data can be provided to analytical systems and artificial intelligence algorithms. In simple words, IIoT It produces data and AI It uses this data to analyze and make decisions. The combination of these two technologies can provide the basis for the creation of intelligent, automatic and data-driven production systems.

 

digital twin; A more advanced stage of intelligent production

In more advanced projects, artificial intelligence can work alongside Digital twin technology (Digital Twin) be used. A digital twin is a digital model of a real machine, production line or process that is updated using operational data. Technology Some changes or production scenarios can be checked first in the digital environment and then implemented in the real system. This can be done to Risk reduction، Process optimization And Increasing the speed of decision making to help.

 

The main advantages of artificial intelligence in production and packaging

The correct use of artificial intelligence can bring many benefits to Industries Create, including:

  • Increasing the productivity of production lines
  • Reducing waste and production costs
  • Improve quality control
  • Reduction of sudden stops of equipment
  • Prediction of machinery failure
  • Optimizing the consumption of energy and raw materials
  • Increasing the speed of production and packaging processes
  • Reducing human errors in repetitive processes
  • Rapid analysis of industrial data
  • Make more accurate decisions based on real data
  • Increasing the ability to track and control processes

 

One of the important questions about entry artificial intelligence To industry Is this technology will replace human power? In many industrial applications, the main objective artificial intelligence It is not a complete replacement of humans, but an increase in human capabilities and the automation of repetitive and predictable tasks. Experts still play an important role in process design, analyzing results, making complex decisions, managing systems, and controlling abnormal conditions.. In fact, the future industry It moves more towards the cooperation of humans, machines, robots and intelligent systems.

 

Challenges of implementing artificial intelligence in production lines

The use of artificial intelligence cannot achieve the desired result without proper infrastructure. Data quality, equipment connectivity, cyber security, integration of automation systems, initial cost and training of manpower are among the factors that should be taken into consideration before implementing the project..

Projects are also required artificial intelligence Start with a real and measurable problem. For example, reducing the downtime of a machine, reducing waste or increasing the accuracy of quality control can be a good starting point for a Industrial project based on AI be.

 

The future of artificial intelligence in the manufacturing industry

move towards Smart factories، Industrial automation And Data-driven production It is expanding rapidly. In the future, more than ever, production lines will be able to monitor their condition, predict potential failures, check product quality in real time, and adjust process parameters to achieve better performance..

The combination of artificial intelligence, industrial Internet of Things, robotics, machine vision, macro

Data and digital twins can form a new generation of production systems; Systems that are not only automatic, but also have the ability to learn, analyze and make decisions.

 

artificial intelligence In Production and packaging lines It is no longer just a futuristic technology; Rather, it has become one of the important tools to increase the productivity and competitiveness of industries. From quality control and machine vision to predictive maintenance, data analytics, waste reduction, and process optimization, AI applications can impact many different parts of a factory. artificial intelligence It depends on choosing the right technology, data quality, automation infrastructure and correct problem definition. Companies that can do this Technology purposefully and step by step into their production processes, they can move towards Smart production، Smart factory And Next generation industry pass with more confidence.

 

انتخاب تکنولوژی _ MANAGEMENT CONSULTATION _ Explanatory plan _ امکان پذیری


Inspection and vehicle type approval certificate

Automatic emergency braking (AEB) What is it and how can it save human lives at high speeds?

تصور کنید خودرویی با سرعت ۸۰ یا ۹۰ کیلومتر بر ساعت در حال حرکت است و ناگهان خودروی جلویی ترمز شدیدی می‌گیرد. راننده تنها چند ثانیه یا حتی کسری از ثانیه برای واکنش فرصت دارد. در چنین شرایطی، ترمز اضطراری خودکار (Automatic Emergency Braking – AEB) می‌تواند فاصله میان یک «هشدار ساده» و یک «تصادف شدید» را تغییر دهد.

سیستم AEB یکی از مهم‌ترین فناوری‌های کمک‌راننده پیشرفته (ADAS – Advanced Driver Assistance Systems) It monitors the condition of the road and the obstacles ahead by using car sensors and warns the driver if a collision is detected, and can automatically activate the braking system in case of insufficient reaction or lack of reaction..

 

Automatic emergency braking (AEB) how does it work

AEB function It is based on a rather complex chain of detection, processing, prediction and reaction. Forward-facing cameras, radar, and in some systems other sensors collect information about vehicles ahead, pedestrians, cyclists, and obstacles..

Central computer car It analyzes the data in a fraction of a second and calculates factors such as distance to the obstacle, relative speed, direction of movement and possible time of collision.. If the system detects that a collision is likely and the driver has not taken sufficient action, the Forward Collision Warning will be issued first (FCW) and then can issue the emergency brake command.

Importantly, AEB is not simply an “auto brake”; Rather, it is a real-time decision-making system that must differentiate between a real risk and a normal situation. Reduce false alarms (False Positive) It is also one of the important engineering challenges of this technology.

 

What sensors are used in the AEB system?

In newer generations AEB is usually from a combination of cameras (Camera) and radar (Radar) is used. The camera can detect visual information and features such as the shape of a vehicle or pedestrian, while radar is useful for measuring the distance and relative speed of objects..

in some cars And more advanced systems may from LIDAR also used, but it should not be assumed that all AEB systems They must be equipped with lidar. The combination of multiple sensors or Sensor Fusion can increase the detection accuracy; Because each sensor has its own strengths and limitations.

For example, a camera is more sensitive to ambient light and visibility conditions, while radar is usually good at detecting distance and relative speed.. Combining data from these sensors into algorithms car It allows them to create a more accurate picture of the surrounding environment.

 

Why is AEB performance more important at high speeds?

At high speeds, the main issue is not just "driver reaction time"; Moreover, the distance traveled during the reaction time and the sharp increase in the car's kinetic energy also becomes important.

For example, a car traveling at 100 km/h travels about 27.8 meters per second.. Therefore, even a second of delay in detection or reaction can destroy tens of meters of the track.

On the other hand, the kinetic energy of the car is proportional to the square of the speed:

E = ½mv²

That is, if the speed of the car is doubled, its kinetic energy will be quadrupled. For this reason, AMelcard AEB At higher speeds, it is not limited to completely preventing accidents; Even if the system cannot stop the car completely, reducing the speed of the collision by a few kilometers per hour can significantly reduce the severity of the accident and the amount of damage..

 

Dramatic progress of AEB in new cars

AAA tests in 2024 showed that AEB technology در خودروهای جدید نسبت به نسل‌های قدیمی پیشرفت قابل توجهی داشته است.در این آزمایش، سه خودروی مدل ۲۰۲۴ با نمونه‌های همان مدل‌ها از سال‌های ۲۰۱۷ و ۲۰۱۸ مقایسه شدند. خودروها در سرعت‌های ۱۲، ۲۵ و ۳۵ مایل بر ساعت، معادل تقریباً ۱۹، ۴۰ و ۵۶ کیلومتر بر ساعت، در شرایط شبیه‌سازی‌شده مورد آزمایش قرار گرفتند.

خودروهای مدل ۲۰۲۴ در آزمایش‌های انجام‌شده تا سرعت ۳۵ مایل بر ساعت توانستند از ۱۰۰ درصد برخوردهای آزمایشی جلوگیری کنند؛ در حالی که خودروهای مدل ۲۰۱۷ و ۲۰۱۸ تنها در ۵۱ درصد آزمایش‌ها موفق به جلوگیری از برخورد شدند.

این نتایج نشان می‌دهد که توسعه نرم‌افزار، الگوریتم‌های تشخیص، حسگرها و پردازش اطلاعات در سال‌های اخیر، عملکرد سیستم‌های ترمز اضطراری خودکار را به شکل محسوسی بهبود داده است.

اما در سرعت‌های بالاتر هنوز چالش وجود دارد!

یکی از نکات جالب آزمایش AAA این بود که افزایش سرعت، عملکرد AEB را با چالش جدی‌تری مواجه می‌کند.در آزمایش‌های سرعت بالاتر، بسیاری از خودروها در سرعت ۴۵ مایل بر ساعت، حدود ۷۲ کیلومتر بر ساعت، توانستند هشدار داده و از برخورد جلوگیری کنند؛ اما در سرعت ۵۵ مایل بر ساعت، حدود ۸۹ کیلومتر بر ساعت، خودروهای آزمایش‌شده در نهایت نتوانستند از برخورد جلوگیری کنند.

این موضوع اهمیت توسعه نسل بعدی AEB را نشان می‌دهد؛ زیرا سیستم باید نه‌تنها سریع‌تر خطر را تشخیص دهد، بلکه بتواند در سرعت‌های بالا، زمان و فاصله کافی برای کاهش سرعت ایجاد کند.در چنین شرایطی، حتی اگر توقف کامل امکان‌پذیر نباشد، کاهش سرعت پیش از برخورد (Pre-Collision Speed Reduction) می‌تواند یکی از مهم‌ترین مزایای سیستم باشد.

 

بیست خودروساز چگونه مسیر توسعه AEB را آغاز کردند؟

گسترش AEB در automotive industry فقط نتیجه رقابت تکنولوژیک شرکت‌ها نبود. در آمریکا، در سال ۲۰۱۵ یک تعهد داوطلبانه با مشارکت ۲۰ خودروساز و همکاری IIHS And NHTSA شکل گرفت تا AEB در بخش بزرگی از خودروهای جدید به تجهیزات Standard become.

این ۲۰ شرکت در مجموع بیش از ۹۹ درصد بازار خودروهای جدید آمریکا را نمایندگی می‌کردند. بر اساس برآورد IIHS، این تعهد می‌توانست تا سال ۲۰۲۵ از حدود ۴۲ هزار تصادف و ۲۰ هزار مصدومیت جلوگیری کند.این تحول نشان می‌دهد که فناوری‌های Car safety به‌تدریج از تجهیزات لوکس و سفارشی به بخشی از تجهیزات استاندارد خودرو تبدیل شده‌اند.

 

قانون‌گذاری جدید؛ AEB از یک قابلیت اختیاری به یک الزام ایمنی

یکی از مهم‌ترین تحولات این حوزه در سال ۲۰۲۴ اتفاق افتاد. NHTSA در آمریکا، Standard جدیدی را نهایی کرد که بر اساس آن، خودروهای سواری و کامیونت‌های سبک جدید باید تا سپتامبر ۲۰۲۹ به سیستم ترمز اضطراری خودکار، از جمله قابلیت تشخیص عابر پیاده، مجهز شوند.

this Standard تنها به وجود AEB اکتفا نمی‌کند، بلکه سطح عملکرد مشخصی را نیز مطالبه می‌کند. بر اساس مقررات جدید، car باید بتواند در شرایط تعریف‌شده تا سرعت ۶۲ مایل بر ساعت، یعنی تقریباً ۱۰۰ کیلومتر بر ساعت، از برخورد با خودروی جلویی جلوگیری کند و همچنین الزامات مشخصی برای عملکرد سامانه در سرعت‌های بالاتر و تشخیص عابر پیاده دارد.NHTSA پیش‌بینی کرده است که این استاندارد در سال‌های اجرای کامل خود بتواند سالانه حداقل ۳۶۰ نفر را نجات دهد و از حدود ۲۴ هزار مصدومیت جلوگیری کند.

 

آیا فناوری AEB جایگزین راننده می‌شود؟

خیر. این یکی از مهم‌ترین نکاتی است که درباره AEB technology باید به آن توجه کرد.AEB یک سیستم کمک‌راننده است، نه یک سیستم رانندگی خودکار. عملکرد آن به شرایط محیطی، کیفیت حسگرها، سرعت خودرو، وضعیت جاده، نور، باران، برف، آلودگی سنسورها و نوع مانع وابسته است.

بنابراین راننده همچنان مسئول کنترل خودرو و توجه به مسیر است. هدف AEB این نیست که راننده را از فرآیند رانندگی حذف کند؛ بلکه هدف آن ایجاد یک لایه حفاظتی اضافی برای شرایطی است که واکنش انسان دیر انجام می‌شود یا اصلاً انجام نمی‌شود.

 

چرا افزایش سرعت، طراحی AEB را دشوارتر می‌کند؟

با افزایش سرعت، فاصله توقف خودرو افزایش پیدا می‌کند و فرصت تصمیم‌گیری برای الگوریتم نیز کاهش می‌یابد. در نتیجه، سیستم باید بسیار زودتر از وقوع برخورد، خطر را تشخیص دهد.از طرف دیگر، AEB باید بین «خطر واقعی» و «موقعیت‌های غیرخطرناک» تفاوت بگذارد. اگر سیستم بیش از حد حساس باشد، ترمزهای ناخواسته می‌تواند برای راننده خطرآفرین باشد؛ و اگر بیش از حد محافظه‌کارانه عمل کند، ممکن است فرصت کافی برای جلوگیری از برخورد از دست برود.

به همین دلیل، توسعه AEB تنها به نصب یک دوربین یا رادار قدرتمندتر محدود نمی‌شود؛ بلکه الگوریتم‌های تشخیص، artificial intelligence، پردازش بلادرنگ، Sensor Fusion، کنترل ترمز و کالیبراسیون سیستم همگی در عملکرد نهایی نقش دارند.

 

نسل آینده AEB به کدام سمت می‌رود؟

مسیر توسعه AEB به سمت سیستم‌هایی است که بتوانند طیف گسترده‌تری از سناریوهای واقعی را تشخیص دهند؛ از خودروهای متوقف‌شده و کاهش ناگهانی سرعت خودروهای جلویی گرفته تا عابران پیاده، دوچرخه‌سواران و شرایط پیچیده‌تر تقاطع‌ها.حتی پژوهش‌های جدیدتر IIHS نشان می‌دهند که AEB می‌تواند در آینده نقش بیشتری در کاهش برخورد با دوچرخه‌سواران داشته باشد؛ البته عملکرد سیستم هنوز در برخی شرایط، به‌خصوص سناریوهای خاص شبانه، محدودیت‌هایی دارد.

همچنین ترکیب AEB با سایر فناوری‌های ADAS مانند هشدار خروج از خط (Lane Departure Warning)، جلوگیری از خروج از خط، کروز کنترل تطبیقی (Adaptive Cruise Control) و سیستم‌های پایش محیط می‌تواند یک شبکه چندلایه برای افزایش Car safety create.

Automatic emergency braking یکی از نمونه‌های موفق تبدیل Technology پیشرفته به یک ابزار واقعی برای کاهش تصادفات جاده‌ای است. این سیستم با استفاده از دوربین، رادار و الگوریتم‌های پردازش اطلاعات، می‌تواند خطر برخورد را در زمان بسیار کوتاهی تشخیص داده و در صورت نیاز وارد فرآیند ترمزگیری شود.

نتایج آزمایش‌های AAA نشان می‌دهد که عملکرد AEB در خودروهای جدید نسبت به نسل‌های اولیه پیشرفت چشمگیری داشته است؛ با این حال، سرعت‌های بالا، شرایط محیطی پیچیده، تقاطع‌ها و تشخیص دقیق کاربران آسیب‌پذیر جاده همچنان از مهم‌ترین چالش‌های پیش روی این فناوری هستند.

در نهایت، شاید مهم‌ترین ویژگی AEB این باشد که تلاش می‌کند چیزی را در اختیار راننده قرار دهد که انسان در لحظات بحرانی معمولاً کمبود دارد: زمان.گاهی تنها چند دهم ثانیه زمان بیشتر برای ترمزگیری می‌تواند تفاوت میان یک هشدار ساده، یک تصادف قابل کنترل و یک حادثه مرگبار باشد.

 

Confirmation of vehicle type (FACING) _ Production compliance (COP) _ Vehicle inspection _ Car standard


Welding inspection and non-destructive tests

Heat treatment after welding (PWHT); Controlling residual stresses and improving welding properties

What is PWHT?

After heat treatment welding (Post Weld Heat Treatment – PWHT) One of the important processes in the construction and maintenance of equipment and metal structures is welding. This process aims to reduce residual stresses, control hardness, modify the microstructure and increase the reliability of the welded joint..

The importance of PWHT is much greater in industries where equipment operates under pressure, high temperature, mechanical loads, or corrosive environments.. For this reason, this process in many projects Pressure vessels، Oil and gas pipelines، Refineries، petrochemical، Power plants and heavy industrial equipment, based on design requirements and StandardThe relevant ones are used.

Why do we need heat treatment after welding?

welding It is a very local thermal process. During welding, an area of ​​base metal and filler metal is heated to a very high temperature and then cooled in a relatively short time.. This rapid heating and cooling cycle causes non-uniform thermal expansion and contraction in the part.

The molten metal of the weld pool (Weld Pool) هنگام انجماد و سرد شدن منقبض می‌شود؛ اما فلز پایه اطراف جوش که سردتر و از نظر مکانیکی محدودکننده است، اجازه نمی‌دهد این انقباض به‌صورت آزادانه اتفاق بیفتد.

نتیجه این فرآیند، ایجاد تنش‌های پسماند (Residual Stresses) و گاهی تغییرات نامطلوب در ریزساختار فلز جوش و منطقه متاثر از حرارت (Heat Affected Zone – HAZ) is.

In thick parts, joints with high constraints and special alloy steels, the amount of these stresses and metallurgical changes can be significant and, if not controlled, affect the long-term performance of the equipment..

 

What is residual stress in welding?

Residual stress is the stress that remains inside the material after the welding process is finished and the part reaches the ambient temperature; Even when no external load is applied to the component.

The presence of residual tensile stress in the vicinity of the weld can increase the probability of occurrence of phenomena such as cracking, brittle failure, fatigue, distortion and cracking caused by the environment under certain conditions.. By creating a controlled thermal cycle, PWHT allows the relaxation of part of the residual stresses, and as a result, the state of stress in the welded joint approaches more suitable conditions..

 

How is the PWHT process done?

In the conventional method, the part or welding area is heated in a controlled manner using suitable heating equipment. The speed of temperature increase, storage temperature and retention time, as well as the cooling rate, should all be determined according to the technical specifications of the project, the material and thickness of the part, and the standard or design code..

 

A typical PWHT cycle includes the following steps:

Controlled heating (Controlled Heating) → reaching the set temperature → keeping at the desired temperature (Soaking) → Controlled cooling (Controlled Cooling)

Importantly, PWHT is not simply "heating the weld"; Rather, it is a controlled metallurgical process and its thermal parameters must be carefully recorded and controlled.

The role of PWHT in reducing hardness and modifying microstructure

One of the important goals of heat treatment after weldingControlling the hardness of the weld area and especially the heat affected area (HAZ) is.

In some steels, especially carbon and low-alloy steels with high hardenability, the cooling rate after welding can cause the formation of hard and brittle microstructures..

PWHT under appropriate conditions can improve the mechanical behavior of the joint by tempering hard microstructures, reducing hardness and increasing toughness and ductility..

Of course, the amount of these changes is completely dependent on the type of steel, chemical composition, welding process, input energy, thickness, cooling rate and applied thermal cycle; Therefore, a fixed temperature or time cannot be considered for all materials and projects.

The difference between PWHT and preheating during welding

One of the common mistakes is to equate Preheating and PWHT. Preheating before and during welding انجام می‌شود و هدف اصلی آن کنترل نرخ سرمایش، کاهش احتمال تشکیل ریزساختارهای سخت، کاهش ریسک ترک هیدروژنی و کنترل شرایط حرارتی اتصال است.

در مقابل، PWHT پس از پایان جوشکاری انجام می‌شود و بیشتر با اهدافی مانند کاهش تنش‌های پسماند، کنترل سختی و اصلاح ریزساختار مرتبط است.بنابراین، این دو فرآیند مکمل یکدیگر هستند و جایگزین یکدیگر محسوب نمی‌شوند.

روش‌های اجرای PWHT

عملیات حرارتی پس از جوشکاری می‌تواند به روش‌های مختلفی اجرا شود. انتخاب روش به ابعاد قطعه، هندسه اتصال، ضخامت، جنس، محل جوش و الزامات پروژه بستگی دارد.در تجهیزات بزرگ، یکی از روش‌های رایج استفاده از گرمایش موضعی با المنت‌های الکتریکی (Electrical Resistance Heating) is. در این روش، المنت‌ها در

اطراف ناحیه جوش نصب شده و دما توسط ترموکوپل‌ها و سیستم کنترل حرارتی پایش می‌شود.در قطعات کوچک‌تر یا تجهیزاتی که امکان قرارگیری کامل در کوره وجود دارد، عملیات حرارتی در کوره (Furnace PWHT) می‌تواند گزینه مناسب‌تری باشد؛ زیرا یکنواختی حرارتی بهتری در کل قطعه ایجاد می‌کند.

 

کنترل دما؛ یکی از مهم‌ترین بخش‌های PWHT

کنترل دقیق دما در عملیات حرارتی پس از جوشکاری اهمیت بسیار زیادی دارد. اختلاف دمای بیش از حد بین بخش‌های مختلف قطعه می‌تواند خود موجب ایجاد تنش‌های حرارتی جدید، اعوجاج یا حتی آسیب متالورژیکی شود.

به همین دلیل، در اجرای PWHT معمولاً از ترموکوپل (Thermocouple)، سیستم ثبت دما و تجهیزات کنترل خودکار استفاده می‌شود،پارامترهایی مانند:

  • نرخ گرمایش (Heating Rate)
  • دمای نگهداری (Soaking Temperature)
  • زمان ماند (Holding Time)
  • نرخ سرمایش (Cooling Rate)
  • اختلاف دما در نقاط مختلف قطعه

باید مطابق الزامات مشخص‌شده کنترل و مستندسازی شوند.

 

چه تجهیزاتی معمولاً به PWHT نیاز دارند؟

الزام به انجام PWHT به جنس، ضخامت، نوع اتصال، شرایط سرویس و کد طراحی وابسته است؛ اما این فرآیند در بسیاری از پروژه‌های حساس برای تجهیزاتی مانند موارد زیر مطرح است:

  • Pressure vessels (Pressure Vessels)
  • خطوط لوله نفت، گاز و پتروشیمی
  • دیگ‌های بخار و تجهیزات نیروگاهی
  • مبدل‌های حرارتی و تجهیزات فرآیندی
  • مخازن و تجهیزات تحت فشار و دمای بالا
  • سازه‌ها و قطعات فولادی ضخیم
  • تجهیزات پالایشگاهی و پتروشیمی
  • برخی اتصالات فولادی با ضخامت بالا و فولادهای کم‌آلیاژ

 

استانداردها و کدهای مرتبط با PWHT

الزامات عملیات حرارتی پس از welding معمولاً بر اساس کد طراحی، مشخصات فنی پروژه و جنس و ضخامت قطعه تعیین می‌شوند.در پروژه‌های صنعتی، Standardها و کدهایی مانند ASME Section VIII، ASME B31.3، ASME B31.1، API و AWS بسته به نوع تجهیز و کاربرد ممکن است الزامات مشخصی برای PWHT، محدوده دمایی، زمان نگهداری و نحوه کنترل فرآیند ارائه کنند.

بنابراین، تصمیم‌گیری درباره الزام یا عدم الزام PWHT نباید صرفاً بر اساس ضخامت قطعه یا یک دستورالعمل عمومی انجام شود؛ بلکه باید کد طراحی و الزامات متالورژیکی و سرویس تجهیز به‌صورت یکپارچه بررسی شوند.

 

آیا PWHT همیشه باعث بهبود خواص می‌شود؟

خیر. عملیات حرارتی یک فرآیند حساس است و اجرای نادرست آن می‌تواند نتیجه معکوس داشته باشد.

دمای بیش از حد، زمان نگهداری نامناسب، نرخ گرمایش یا سرمایش نامتناسب و توزیع حرارتی غیریکنواخت می‌تواند باعث تغییر نامطلوب ریزساختار، افت خواص مکانیکی، اعوجاج یا ایجاد تنش‌های حرارتی جدید شود.

به همین دلیل، PWHT باید بر اساس Welding Procedure Specification (WPS)، الزامات Procedure Qualification Record (PQR) و دستورالعمل حرارتی تأییدشده پروژه اجرا و مستندسازی شود.

 

کنترل کیفیت پس از PWHT

پس از اجرای عملیات حرارتی، بسته به الزامات پروژه ممکن است بازرسی‌ها و آزمون‌های مختلفی انجام شود تا اطمینان حاصل شود که اتصال جوشی همچنان الزامات طراحی را برآورده می‌کند.این کنترل‌ها می‌توانند شامل بررسی نمودار سیکل حرارتی، کنترل سختی، Non-destructive tests (NDT) مانند UT، RT، MT یا PT و در موارد خاص آزمون‌های مکانیکی و متالورژیکی باشند.

نمودار ثبت سیکل حرارتی (Temperature Chart/Record) نیز یکی از مدارک مهم کنترل کیفیت است و می‌تواند نشان دهد که قطعه در محدوده دمایی و زمانی تعیین‌شده قرار گرفته است.

 

در واقع PWHT؛ یک فرآیند متالورژیکی، نه صرفاً حرارتی،نکته مهم درباره PWHT این است که هدف آن فقط «گرم کردن جوش» نیست. در واقع، این فرآیند ترکیبی از مهندسی جوش، متالورژی، انتقال حرارت و Quality control is.

طراحی صحیح سیکل PWHT باید با در نظر گرفتن عواملی مانند ترکیب شیمیایی فولاد، ضخامت، کربن معادل (Carbon Equivalent)، فرآیند جوشکاری، نوع الکترود یا سیم جوش، انرژی ورودی، هندسه اتصال، شرایط سرویس و الزامات کد طراحی انجام شود.

 

Heat treatment after welding (PWHT) یکی از فرآیندهای کلیدی در ساخت تجهیزات و سازه‌های جوشکاری‌شده با حساسیت بالا است. کاهش تنش‌های پسماند، کنترل سختی، اصلاح ریزساختار و افزایش قابلیت اطمینان اتصال از مهم‌ترین اهداف این فرآیند هستند.

اجرای موفق PWHT به انتخاب صحیح سیکل حرارتی، کنترل دقیق دما، استفاده از تجهیزات مناسب، پایش ترموکوپل‌ها، ثبت اطلاعات و رعایت الزامات کدها و استانداردهای مرتبط وابسته است.

In پروژه‌های نفت، گاز، پتروشیمی، نیروگاهی و صنایع سنگین، توجه به PWHT و مستندسازی صحیح آن می‌تواند نقش مهمی در افزایش عمر سرویس، کاهش ریسک خرابی و اطمینان از عملکرد ایمن تجهیزات داشته باشد.

 

Welding inspection _ آزمون های غیرمخرب _ TECHNICAL INSPECTION _ Inspection during construction


Choosing technology in the food industry

Robotic engineering in the food industry; From production automation to smart factory

introduction; Why has robotics entered the food industry?

Today, robotic engineering has become one of the key technologies in the food industry and production and packaging lines. The increase in market demand, the need for faster production, the need for uniform quality, waste reduction, as well as the increasing importance of food hygiene and safety have caused the use of industrial robots and automation systems in food factories to expand rapidly..Robots can perform many repetitive, fast and precise activities in manufacturing environments; From picking and moving food to sorting, filling, packing, palletizing and quality control.

In addition to increasing productivity, this issue provides the possibility of better control of the process and reduction of human errors.In fact, robotics in the food industry is no longer considered an advanced or luxury technology, but has become one of the important tools to increase productivity, reduce production costs, improve quality and maintain the competitiveness of factories..

What are the uses of industrial robots in the food industry?

One of the most important applications of robotics in the food industry is the transfer and handling of products. Robots can transfer products with high speed and accuracy from one part of the production line to another, and tasks such as Pick & Place.Robots are also widely used in packaging lines. Putting products in boxes, sorting packages, placing products in trays, secondary packaging and transferring cartons are among the processes that can be performed by industrial robots or food industry robots..

Another important application is automatic palletizing and depalletizing. Palletizer robots can place packages and cartons with a specific pattern on the pallet, and at the end, the product is ready to be transferred to the warehouse or distribution department.. This process, while increasing the speed, reduces the physical pressure caused by the constant moving of the load from human power.

What are the characteristics of suitable robots for the food industry?

A robot that operates in the food industry environment is not necessarily the same robot that is used in a car factory.. Environmental conditions, health requirements and the type of product make the design of robotic equipment in the food industry particularly important.In many applications, equipment must be able to withstand moisture, washing, detergents, and stringent hygiene conditions..

Also, the material and design of the surfaces in the areas where there is a possibility of contact with the product should be such that the possibility of the accumulation of contamination is reduced and the cleaning and disinfection process can be done easily..For this reason, choosing the right robot should be done based on the type of product, line speed, product weight, working environment, amount of washing, hygiene requirements and required standards..

Increasing production speed and capacity using robotics

One of the most important advantages of food industry automation is increasing production capacity. Robots can repeat certain operations for a long time with constant speed and high accuracy.In processes where a large number of products must be moved, sorted or packaged in a short period of time, the use of robots can reduce production line bottlenecks..

Also, the coordination of the robot with the conveyor belt, packaging devices, control systems and other equipment makes the production process more integrated and stable..One of the important points is that increasing the production capacity does not only mean increasing the speed of the robot; Rather, it is the coordination between the robot, machinery, sensors, control system and production management software that determines the actual performance of an automated line..

Reducing operating costs and wastecost reduction

Another important reason is the use of robots in the food industry. Robots can perform many repetitive operations with high precision, reducing errors, rework, and product damage..In the food industry, even a small amount of waste reduction on a mass production scale can have a significant economic impact.

More accurate control of product quantity, correct handling, uniform packaging and reduction of errors in arrangement can help to reduce food waste and increase the productivity of raw materials..Of course, the economic efficiency of a robotic system depends on various factors such as production capacity, number of shifts, manpower cost, product type, process complexity, maintenance cost, and system usage rate; Therefore, it is very important to evaluate the return on investment or ROI before implementing the project.

Robotics and increasing food hygiene and safety

One of the most important advantages of robotics in the food industry is the reduction of unnecessary human contact with the product. As sensitive processes are properly designed and carried out under controlled conditions, it is possible to better control the risks associated with contamination..Robots can work in areas such as transporting, sorting, and packaging products, reducing direct human contact with food..

This issue is especially valuable in environments where compliance with health requirements is very important.However, using a robot alone does not guarantee food safety. Hygienic design of equipment, washing and disinfection programs, contamination control, proper maintenance and compliance with food safety management systems requirements are still essential..

accuracy and repeatability;

One of the strengths of robotsPerforming the same operation for thousands or millions of products can cause fatigue and reduce human accuracy; While the robot is designed to perform repetitive operations.

Robots are able to execute the defined path and movement with high repeatability. This feature is very important in processes such as product arrangement, packaging, sorting and palletizing.High repeatability also helps to create consistent product and packaging quality and can reduce variation between products produced on different shifts or days..

machine vision; Smart eye

Production linesOne of the most interesting technologies related to robotics in the food industry, machine vision (Machine Vision) is. In these systems, cameras and image processing algorithms allow the robot and the control system to receive and analyze visual information of the environment..

For example, a machine vision system can identify products, determine their location, and remove products that have defects in appearance, shape, or packaging from the line..Robot composition + Machine vision makes the robot not only a repeating device, but also able to react to the real conditions of the production line.

artificial intelligence; The next step of robotics in the food industry

The arrival of artificial intelligence (AI) to production lines, has developed the capabilities of robotic systems more than before. AI algorithms can be used to recognize patterns, identify defective products, analyze images, and even predict some process problems..

For example, a system equipped with a camera and machine learning algorithms can categorize products based on visual characteristics or detect defects that are more difficult to detect with traditional methods..The combination of artificial intelligence, machine vision, robotics, sensors and industrial control systems is one of the main paths of the food industry towards intelligent production..

The role of robotics in realizing the smart factory

The concept of Smart Factory goes beyond installing a few robots in the production line. A smart factory is a set of technologies in which machines, sensors, software and management systems are connected to each other and production process information is continuously collected and analyzed..

In such an environment, robots can be part of a digital ecosystem; Receive production information, report equipment status and coordinate with other machines in the production line.Technologies such as Industrial IoT, real-time data capture, MES systems, artificial intelligence and predictive maintenance (Predictive Maintenance) Together with robotics, they can form the infrastructure of a smart food factory.

predictive maintenance; Avoid sudden stoppage of the production line

One of the important uses of production data is the possibility of Predictive Maintenance.By using sensors and data analysis, it is possible to monitor the condition of some equipment, engines, gearboxes or mechanical components and identify the early signs of failure before the system stops completely..This approach is very important in the food industry; Because the sudden stop of the line can, in addition to the cost of repairs, stop production, reduce capacity, and even cause problems for raw materials or products being processed..

The main advantages of robotics in the food industry

Correct and engineered use of robotics can provide numerous benefits for food processing plants:

  • Increase production capacity and speed
  • Reduce operating costs
  • Increasing accuracy and repeatability of processes
  • Reduce waste and rework
  • Improving uniformity of product quality
  • Reduction of direct human contact with the product
  • Improving the level of hygiene and process control
  • Reducing heavy and repetitive activities for employees
  • Ability to work in multiple shifts and continuous productionIncrease the ability to track and collect production data
  • Ability to connect to production control and management systems
  • Provision of smart factory infrastructure.

Will robots replace human labor in the food industry?

The main goal of automation is not necessarily to eliminate human labor; Rather, it is a change in the type of human activity. Robots can take over repetitive, heavy, high-speed, or demanding tasks, leaving humans to focus more on activities such as monitoring, quality control, planning, maintenance, data analysis, and process management..

From this point of view, robotics can strengthen the cooperation between man and machine. In many modern factories, the future of the food industry will not be "man or robot", but man alongside the robot.

Challenges of implementing robotics in the food industry

Despite the many benefits, implementing a robotics project requires careful consideration. The initial cost of purchasing equipment, robotic cell design, programming, operator training, maintenance and provision of spare parts are among the things that should be taken into consideration before implementing the project..

On the other hand, food products are usually very diverse and may differ from each other in terms of shape, size, weight, texture, and packaging.. Therefore, the design of flexible automation systems becomes especially important for many food lines.Incorrect selection of the robot or inappropriate design of the process can cause the system not to reach the expected capacity; Therefore, before purchasing the equipment, the process, production rate, cycle time, installation space, product specifications and health requirements should be carefully analyzed..

The future of robotics in the food industry

The future of the food industry is moving towards lines where robotics, artificial intelligence, machine vision, industrial Internet of Things and data analysis work side by side..

The robots of the future will not only carry out the task of moving or packaging the product; Rather, they can use the data from sensors and vision systems to make more accurate decisions to carry out the process and adapt to changing production conditions..Also, the development of Collaborative Robots (Cobots) It can enable the automation of some processes in environments where close human-robot cooperation is required.

Robotics, the path of the food industry towards intelligent production

Robotics in the food industry provides manufacturers with a combination of speed, accuracy, repeatability, automation and process control.. From packaging and palletizing lines to quality control, moving and sorting products, robots can play an important role in increasing productivity and reducing errors..

With the addition of machine vision and artificial intelligence, the capabilities of this technology will be much broader and the ground will be provided for the creation of flexible, data-driven and intelligent production lines..Finally, robotics can be considered as one of the key technologies for moving the food industry from traditional and semi-automatic production to advanced automation and smart factory; A path that can increase the quality, productivity, safety and competitiveness of producers in the future market.

Food industry _ Preparation of justification _ MANAGEMENT CONSULTATION _ Feasibility studies


Inspection and non-destructive tests

Penetrating liquid test (PT); Inspection procedures, applications and important technical points

Penetrating liquid test (PT) what is it

Penetrating liquid test (Penetrant Testing یا PT) One of the most used methods Non-destructive tests (NDT) It is used to identify discontinuities and surface defects in parts and equipment. In this method, a liquid with high penetrability is applied to the surface of the part to penetrate cracks, pores, laps, seams or other discontinuities open to the surface..
After removing the excess penetrant from the surface, using the detector (Developer), the remaining liquid within the discontinuities returns to the surface and appears as a visible signature..
One of the most important advantages of liquid penetrant inspection is that, unlike many other methods, it does not require complex and expensive equipment and can be used to inspect a wide variety of non-porous metal and non-metal parts..
Application of PT test in technical inspectionPenetrating liquid test is used in various industries such as oil, gas and petrochemical, power plants, aerospace, automotive, foundry, industrial equipment manufacturing, pressure vessels and marine industries..
This method can be used to inspect parts such as welds, joints, flanges, machined parts, cast and forged parts, and also to identify surface cracks in equipment..
especially in Welding inspection (Welding Inspection)PT test can be used to identify defects such as surface cracks, lack of fusion open to the surface, open porosity and some surface discontinuities..

Penetrating liquid test steps (PT):

The penetrant inspection process consists of several main steps. The correct and controlled implementation of each step is very important; Because the quality of the final PT result directly depends on surface preparation, penetration time, cleaning method and observation conditions:
۱. Surface cleaning (Cleaning)
The first and one of the most important steps of penetrant testing is the complete cleaning of the tested surface.
The surface of the part must be cleaned of any oil, grease, dust, rust, paint, oxide scale, water, chemicals and other contaminants that can prevent the penetration of the penetrating liquid..
The presence of contamination on the surface may block the opening of a crack and prevent penetrating fluid from entering the discontinuity. As a result, a true defect may not be detected or its signal may be weaker than the actual value.
Therefore, cleaning is not just a preliminary step; Rather, it is one of the main factors of PT test accuracy and reliability.
۲. Penetrating fluid application (Applying Penetrant)
After surface preparation, penetrating fluid (Penetrant) It is applied on the surface of the part in a suitable way.
Penetrating liquid due to wetting properties (Wetting) and capillary forces (Capillary Action) It can enter discontinuities that are open to the surface.
At this stage, it must be ensured that the entire inspected area is uniformly covered with the penetrating liquid.
The penetrant used can be colored or visible (Visible Dye Penetrant) or fluorescent (Fluorescent Penetrant) be.
۳. Time to stop or penetrate (Dwell Time)
After applying the penetrating liquid, a certain period of time should be considered for its penetration into the discontinuities. This time is known as dwell time.
Penetration time depends on factors such as the type of penetrating liquid, the material and condition of the surface of the part, the type and possible size of the discontinuity, and the implementation instructions of the test..
If the penetration time is too short, the penetrating fluid may not have enough time to penetrate very small defects. On the other hand, an unreasonable increase in penetration time does not necessarily increase the accuracy of the test.
For this reason, the stopping time should be determined according to the instructions of the manufacturer of the consumables and the implementation method or the relevant standard.
۴. Wipe off excess penetrant (Excess Penetrant Removal)
At the end of the penetration time, the excess penetrating liquid that remains on the surface of the part must be removed in a suitable way.The purpose of this step is to remove the penetrant on the surface, while leaving the penetrant trapped inside the discontinuities..
This stage is one of the most sensitive parts of the PT test.If the surface is cleaned too much, the penetrant may also escape through the discontinuity and the true indication of the defect is lost. On the other hand, if the excess penetrant is not properly removed, too much background is created and the possibility of false indication is increased..
۵. Surface drying (Drying)
After removing the excess penetrant, the surface of the part is dried if necessary to provide suitable conditions for the detection step.
Residual moisture on the surface can affect the performance of the detector material and reduce the quality of the sighting of the marks.Method and dry conditions It should also be selected according to the implementation method and the type of penetrating material system.
۶. Apply the detector (Applying Developer)
In this step, the detector or developer is applied to the surface.
The developer acts as an absorbing medium and pulls the penetrant remaining inside the discontinuity towards the surface.. As a result, the defect mark becomes larger and more visible.
In fact, the detector increases contrast and detectability (Detectability) It becomes signs.
Choosing the type of developer and how to apply it can have a significant impact on the quality of the inspection. Depending on the system used, the detector can have different types and its selection should be done according to the requirements of the test method.
۷. View and evaluate results (Inspection & Interpretation)
After applying the developer and passing the appropriate time to form the mark, the surface of the part is observed.In the color penetrating liquid method (Visible Penetrant), the marks are usually seen as a color effect with a suitable contrast to the surface and the inspection is done under visible light conditions..
In fluorescent penetrant method (Fluorescent Penetrant), signs obtained under ultraviolet light (UV-A) are observed. This method usually allows the detection of very small discontinuities and is therefore used in many sensitive applications..
During the evaluation, the appearance, shape, length, position and direction of signs are checked and their dimensions are recorded if needed..The important thing is that every symptom does not necessarily mean the presence of a failing defect. Interpretation of the sign must be done by a competent person based on the project acceptance criteria, map, technical specification or relevant standard.

The difference between colored PT and fluorescent PT

In terms of general principles, the inspection procedures with colored and fluorescent penetrants are very similar; But the most important difference is in the system of observing signs.
In the color method, signs are observed with visible light and based on color contrast.
But in the fluorescent method, the penetrant has fluorescent compounds, and appropriate ultraviolet light is used in a controlled environment to observe the signs..In general, the fluorescent method can have a higher sensitivity for detecting very subtle discontinuities; However, the choice between colored and fluorescent PT should be made based on the material of the part, the level of sensitivity required, the inspection conditions, the project requirements and the relevant standard..
What defects can be detected by penetrative liquid test?
The PT test is mainly designed to identify open surface discontinuities.
Among the items that can be identified, the following items can be mentioned:
Surface cracks (Surface Cracks)
Cracks caused by fatigue (Fatigue Cracks)
Thermal cracks (Thermal Cracks)
Cracks caused by heat treatment
Lap (Laps)
Surface seams (Seams)
Porosity open to the surface (Surface-connected Porosity)
Some surface discontinuities in welding and cast and forged parts
However, PT is not suitable for detecting internal defects and discontinuities that do not reach the surface. For such cases, methods such as ultrasonic testing are possible (UT), radiography (RT) or other NDT methods are required.

Why is surface preparation so important in the PT test?

One of the important points in penetrant testing is that PT is sensitive to surface conditions.A very rough, porous, or contaminated surface can cause spurious signals, increase background, and make results difficult to interpret..
For example, high surface roughness may trap penetrant in surface depressions and cause symptoms that are not necessarily caused by a true crack or defect..
For this reason, the condition of the surface of the part must be checked before the test, and if necessary, appropriate preparation operations must be performed.

Advantages of liquid penetrant testing (PT)

Liquid penetrant testing is one of the popular methods in non-destructive inspection due to the following features:
No damage to the piece
PT test is a non-destructive method and if performed correctly, it will not damage the part.
Ability to identify very small cracks
Especially in fluorescent systems, it is possible to observe small surface discontinuities.
Usability for complex geometries
Unlike some NDT methods, the complex shape of the part does not necessarily preclude PT.
Relatively simple equipment
In many applications, portable systems can be used to perform on-site testing.
Reasonable cost
Compared to many advanced inspection methods, the cost of performing PT is usually lower.
Penetrating liquid test limitations
Despite its many advantages, PT also has limitations.This method can only detect discontinuities that are open to the surface and is not suitable for fully internal defects..Also porous materials or surfaces Too coarse can cause background and false marks.
In addition, in the fluorescent method, ambient light conditions and UV equipment must be provided in a controlled manner to maintain the sensitivity and detection capability of the test..
The role of standards in Penetrating liquid inspection، PT results should not be judged solely by operator observation without specific criteria. The standard and Acceptance Criteria determine that an indication is acceptable, evaluable or rejected.
Standards such as ASME, ASTM, ISO, and related industry standards may have different requirements for surface preparation, consumables, test methods, observation conditions, personnel qualifications, and acceptance criteria..
Therefore, in industrial projects, the selection of the PT method should be done according to the technical specifications of the project, the reference standard, the type of part and the required level of sensitivity..
Quality control in PT testing To achieve a reliable result, it is not enough to have penetrant and developer. The quality of consumables, surface conditions, process times, lighting conditions, equipment used and inspector qualifications must all be controlled.Also, test consumables must be kept according to the relevant requirements and controlled or checked if needed.
In sensitive projects, documenting the process and results is also very important, and the inspection report can include part specifications, inspection scope, test method, consumables, test conditions, observed signs, and the final result..
Penetrating liquid test (PT) It is a simple but very sensitive method for identifying surface discontinuities. This test starts from the cleaning stage and continues with the application of penetrating liquid, penetration time, removal of excess liquid, drying, application of developer and finally observation and evaluation of symptoms..
The main difference between the two common Visible Penetrant and Fluorescent Penetrant systems is in the way of observing the signs; So, in the fluorescent method, suitable ultraviolet light is used for detection.
The correct implementation of all steps, compliance with the set times, proper preparation of the surface, control of the observation conditions and interpretation of the results based on the standard and acceptance criteria play a fundamental role in the accuracy and reliability of the penetrative liquid inspection..
For this reason, PT, despite its apparent simplicity, is a specialized process, and the quality of the result will depend as much on the materials and equipment as on the correct execution method and the experience and competence of the inspector..

Welding inspection _ Non-destructive testing _ TECHNICAL INSPECTION _ NDT


NDT

Inspection of magnetic particles (MT / MPI); Principles, applications and requirements of non-destructive testing

Inspection of magnetic particles (MT / MPI); Principles, applications and requirements of non-destructive testing

Quality control and ensuring the safety of equipment, structures and industrial parts is one of the most important parts of production, repair and maintenance processes.. Meanwhile, non-destructive tests (NDT) They play an important role in identifying possible defects and discontinuities without damaging the part.
Inspection of magnetic particles (Magnetic Particle Testing – MT یا MPI) One of the widely used methods is non-destructive testing, which is especially used to identify surface and near-surface discontinuities in ferromagnetic materials..This method is widely used in welding inspection, quality control of steel parts, inspection of industrial equipment, crack detection, control of machined parts and evaluation of parts under stress..

What is a magnetic particle test?

MT test is a non-destructive test method (NDT) which, by creating a magnetic field in the piece, allows the identification of cracks and discontinuities on the surface and close to the surface.The basis of the work is very simple but physically accurate:First, the test piece is magnetized.
Then, very fine ferromagnetic particles, usually as a dry powder or a wet suspension, are applied to the surface of the part..If there is a suitable crack or discontinuity in the path of the magnetic flux, the magnetic flux will change at the defect location and part of it will leave the surface of the part.. This phenomenon that Magnetic Flux Leakage (MFL) or it is called magnetic flux leakage, it causes the accumulation of magnetic particles in the place of discontinuity.As a result, the defect appears as a visible mark on the surface.
In simple language:Magnetic field → flux passing through the part → presence of cracks → flux deflection → flux leakage → accumulation of magnetic particles → visible mark formationThis mechanism is the basis of the operation of the Magnetic Particle Inspection method.
Principles of performance Inspection of MTTo better understand the magnetic particle test, one should pay attention to the behavior of the magnetic field in a ferromagnetic piece.When the piece is magnetized, lines of magnetic flux move through it.
If the structure of the part is uniform, the flux will also have a relatively uniform path.But the existence of such a discontinuity:surface crackSubsurface crackLack of FusionCracks caused by heat treatmentLeave fatiguestop grindingCracks caused by weldingIt can disrupt the flow path.At the place of discontinuity, due to the change of magnetic permeability, part of the flux leaves the surface of the piece and a magnetic leakage field is created..
The magnetic particles that are placed on the surface are affected by this field and accumulate in the place of flux leakage.Therefore, a visible indication is created that can indicate the existence of a discontinuity.Important point: Any symptom observed in the MT test does not necessarily mean the presence of a failing crack. The sign must be interpreted and, if necessary, evaluated and classified by a qualified inspector.
Magnetic particle test proceduresA standard MT inspection process typically includes the following steps:
1. Surface preparationThe surface to be tested should be as clean as possible and free from contamination such as:Oil and greaseRust and surface crustsPaint and thick coatingsdustPollution caused by the manufacturing processbe.
The quality of surface preparation can directly affect the ability to detect and interpret signs.
2. Magnetize the pieceAt this stage, a suitable magnetic field is created in the part.The method of creating the field can be different based on the geometry of the part and the possible direction of the defect.
3. Application of magnetic particlesMagnetic particles are applied on the surface as Dry Powder or Wet Suspension.Particles are possible:be visible in white light; orFluorescent and visible under UV/UV-A light.
4. Observation and interpretation of signsAfter applying the particles, the surface of the piece is checked and the marks created are recorded and interpreted.The shape, length, direction, location, and intensity of the sign can provide important information about the nature of the discontinuity.
5. EvaluationThe inspector must specify that the observed sign:RelevantNon-relevantor in some circumstances False Indicationis.Then relevant indications based on standard, code, project specifications or acceptance criteria (Acceptance Criteria) are evaluated.
6. Demagnetization and cleaningIf necessary, after inspection, the part is demagnetized to reduce residual magnetism.This stage is especially important for the parts that will enter sensitive industrial processes.The importance of direction Magnetic field in MT testOne of the most important technical points in the inspection of magnetic particles is the direction of the magnetic field relative to the direction of the defect.
To achieve the best sensitivity, the magnetic field should be approximately perpendicular to the probable direction of the discontinuity.For example, if the crack is along the length of the part, creating a transverse field can give a better indication.For this reason, bidirectional magnetization is commonly used in sensitive inspections to reduce the chance of missing cracks with different orientations..This issue is one of the key points in the design and correct implementation of the MT test.
Methods of creating a magnetic field in MTDepending on the type of part, equipment and geometry under test, there are different ways to create a magnetic field.Magnetic yoke method (Magnetic Yoke)The magnetic yoke is one of the common equipment in the inspection of welds and steel parts.By creating a local magnetic field, this equipment provides the possibility of inspecting different areas of the part, and it is especially useful in inspecting corner welds, joints and relatively large parts..
Direct current method (Direct Contact / Head Shot)In this method, electric current is passed through the part and the magnetic field created around the current path is used to identify discontinuities..
Induction current method and central conductorFor some specific geometric parts, such as circular or cylindrical parts, suitable field induction methods or the use of a central conductor can be used..Choosing the right method depends on the geometry of the part, the material, the type of expected defect, the direction of the defect and the level of sensitivity required.dry particles or wet particles; Which is better?Magnetic particles used in MT are usually divided into two main groups:Dry Magnetic ParticlesIn the dry powder method, the particles are applied directly to the surface.This method can be suitable for situations where the surface is relatively rough or when the inspection is done on site.Wet Magnetic ParticlesIn the particulate method, magnetic particles are suspended in a liquid carrier and applied to the surface.The Wet Fluorescent method usually has a high sensitivity for detecting subtle signs and is used in many industrial quality control processes..

What is the fluorescent MT test?

In Fluorescent Magnetic Particle Testing, fluorescent magnetic particles are used.These particles are exposed to UV-A radiation under suitable conditions and the resulting signs are visible with high contrast..This method can be very effective for detecting subtle discontinuities, especially in controlled inspection environments..Of course, its correct performance depends on factors such as ambient light conditions, appropriate intensity of UV-A light, surface condition, particle concentration, and correct equipment adjustment..Application of magnetic particle test in welding inspectionOne of the most important applications of MT is the inspection of welds and welded joints.After welding, some surface and near-surface cracks or discontinuities may develop in the weld zone, HAZ, or base metal..MT test can check things like:Weld surface cracksLongitudinal cracksTransverse cracksShrinkage cracksGrinding cracksSome inconsistencies related to Lack of FusionDiscontinuities near the surfacebe used.
However, MT is not suitable for all weld defects and the choice of NDT method should be based on material type, defect type, part geometry and project standard requirements..
Advantages of magnetic particle inspectionAmong the most important advantages of MT, the following can be mentioned:
Fast detection of defects: The inspection process is relatively quick in many applications.Good sensitivity to cracks: Especially the cracks that are on the surface or near the surface.
The possibility of inspecting different geometries: By choosing the right equipment and magnetizing method.Relatively reasonable cost: Compared to some more advanced NDT methods.No damage to the piece: As with other non-destructive methods, if performed correctly, the part can be reused.Suitable for welding inspection: One of the main applications of this method is in various industries.MT test limitationsDespite its significant advantages, MT is not a general method for all materials and all types of defects.Its most important limitation is that it is only suitable for ferromagnetic materials.
So usually for materials like:Carbon steelsMany low alloy steelsIron and some ferromagnetic alloyscan be used.But for materials such as aluminum, copper and many austenitic stainless steels, MT cannot be used in the usual way..
In such cases, methods such as PT, UT or RT may be more suitable options.Also, MT is not an ideal method for deep defects inside the part that are far from the surface.MT compared to PTOne of the common questions In the technical inspection, is the test MT or PT better?The answer depends on the material of the part and the type of defect.PT (Liquid Penetrant Testing) It can be used for a very wide range of materials, including non-magnetic materials, and mainly reveals defects that are exposed to the surface..In contrast, MT is only applicable to ferromagnetic materials, but it can reveal near-surface discontinuities in addition to some surface defects..Therefore, the choice between MT and PT should be made based on the actual condition of the part and the technical requirements of the project.
TestMT in inspection and quality control systemMagnetic particle testing should not be considered a separate process from other technical inspection and quality control activities.In industrial projects, MT can be part of a comprehensive NDT Inspection program that, depending on project requirements, includes methods such as:Visual Testing (VT)Liquid Penetrant Testing (PT)Magnetic Particle Testing (MT/MPI)Ultrasonic Testing (UT)Radiographic Testing (RT)and in specific applications of more advanced NDT methodsis.Choosing the right combination of NDT methods depends on the material, welding procedure, type of equipment, risk level, design standard and acceptance criteria..
Importance of inspector qualification and equipment in MTThe quality of the test result does not depend only on the equipment itself. Qualification and experience of the inspector, implementation method, surface preparation, correct choice of technique, field intensity, field direction, type of particles and correct interpretation of signs all affect the result..For this reason, the implementation of MT should be done according to the relevant guidelines and standards and by qualified people.Also, inspection equipment should be kept in proper conditions and calibrated and verified if needed.
Standards related to magnetic particle testingThe standard used should be selected according to the type of project, industry and contract. from Standardand technical documents known in this field can include things like:ASME Section VASTM E709ASTM E1444/E1444MISO 9934pointed out.
Of course, simply using a standard is not enough; Defect acceptance criteria may be specified in the design standard, welding code, project specifications or contractual documents.
Inspection of magnetic particles (MT/MPI) One of the important and practical methods in the family Non-destructive tests (NDT) It is used to identify cracks and other surface and near-surface discontinuities in ferromagnetic materials..The basis of this method is the creation of a magnetic field, the creation of flux leakage at the discontinuity location and the accumulation of magnetic particles at the leakage location.
Relative simplicity, appropriate speed, favorable sensitivity to cracks and the ability to be used in the inspection of welds and steel parts have made MT one of the important methods in quality control programs, technical inspection and ensuring the safety of industrial equipment..However, obtaining a reliable result requires the selection of the right technique, the correct direction of the magnetic field, the proper preparation of the surface, the control of the test conditions, the reliable equipment, the correct implementation of the instructions and the expert interpretation of the results..Ultimately, MT creates the most value when used as part of a comprehensive NDT and technical inspection program tailored to the risk and requirements of each project..

Welding inspection _ Non-destructive testing _ TECHNICAL INSPECTION _ NDT


oilandgas

Automatic welding in the installation of offshore pipelines; Ensuring the quality, safety and integrity of the pipeline

Automatic welding in the installation of offshore pipelines; Ensuring the quality, safety and integrity of the pipeline

نصب خطوط لوله فراساحلی (Offshore Pipelines) یکی از پیچیده‌ترین و چالش‌برانگیزترین فعالیت‌های مهندسی در صنایع نفت، گاز و انرژی است. شرایط سخت محیطی، محدودیت‌های عملیاتی، دسترسی دشوار، فشار زمانی بالا و اهمیت حیاتی عملکرد خط لوله باعث می‌شود کوچک‌ترین نقص در فرآیند ساخت یا اتصال، در بلندمدت به یک مسئله جدی تبدیل شود.
در پروژه‌هایی که از خطوط لوله با قطرهای بزرگ، برای مثال خطوط ۴۲ اینچی، استفاده می‌شود، تعداد زیاد اتصالات و جوش‌ها اهمیت فرآیند جوشکاری خطوط لوله را دوچندان می‌کند. هر جوش بخشی از زنجیره یکپارچگی خط لوله است و کیفیت آن مستقیماً بر ایمنی، قابلیت اطمینان و طول عمر سیستم تأثیر می‌گذارد.
به همین دلیل، پروژه‌های مدرن فراساحلی بیش از گذشته به سمت استفاده از سیستم‌های جوشکاری خودکار و مکانیزه حرکت کرده‌اند؛ فناوری‌هایی که می‌توانند کیفیت جوش را پایدارتر، سرعت تولید را بیشتر و وابستگی فرآیند به مداخله مستقیم اپراتور را کمتر کنند.

چرا جوشکاری در خطوط لوله فراساحلی اهمیت ویژه‌ای دارد؟
خطوط لوله فراساحلی معمولاً در محیط‌هایی نصب می‌شوند که دسترسی و تعمیرات آنها بسیار دشوارتر و پرهزینه‌تر از خطوط لوله خشکی است. یک خط لوله زیر دریا ممکن است سال‌ها در معرض فشار داخلی، تنش‌های مکانیکی، جریان‌های دریایی، خوردگی، تغییرات دما و بارهای ناشی از حرکت بستر دریا قرار داشته باشد.

در چنین شرایطی، کیفیت اتصال جوشی تنها یک موضوع مربوط به ساخت نیست؛ بلکه بخشی از طراحی و مدیریت ریسک کل سیستم محسوب می‌شود.
یک جوش نامناسب می‌تواند در طول زمان تحت تأثیر عواملی مانند:
تنش‌های چرخه‌ای و خستگی
عیوب داخلی یا سطحی جوش
هیدروژن و ترک‌خوردگی
تمرکز تنش
خوردگی موضعی
تغییرات دمایی
فشار و بارهای عملیاتی
قرار گرفته و در نهایت بر عملکرد خط لوله تأثیر بگذارد.
سیستم جوشکاری خودکار چگونه به پروژه‌های فراساحلی کمک می‌کند؟
یکی از مهم‌ترین مزایای جوشکاری اتوماتیک خطوط لوله، کنترل دقیق‌تر پارامترهای فرآیند است. در سیستم‌های پیشرفته، پارامترهایی مانند جریان، ولتاژ، سرعت حرکت، نرخ تغذیه سیم، نوسان مشعل و سایر متغیرهای فرآیند می‌توانند با دقت بالا کنترل و ثبت شوند.

این کنترل باعث می‌شود شرایط جوشکاری از یک اتصال به اتصال دیگر ثبات بیشتری داشته باشد.

۱. افزایش یکنواختی و تکرارپذیری جوش
در جوشکاری دستی، کیفیت نهایی می‌تواند تحت تأثیر مهارت، خستگی، وضعیت کاری و شرایط محیطی اپراتور قرار گیرد. در مقابل، سیستم‌های خودکار می‌توانند مسیر و پارامترهای جوشکاری را با دقت و تکرارپذیری بالا اجرا کنند.
نتیجه، تولید تعداد زیادی اتصال با کیفیت و مشخصات فرآیندی یکنواخت‌تر است؛ موضوعی که در پروژه‌های طولانی و دارای هزاران اتصال جوشی اهمیت زیادی دارد.

۲. افزایش سرعت اجرای پروژه
پروژه‌های فراساحلی معمولاً برنامه زمانی فشرده‌ای دارند و هر ساعت توقف تجهیزات و شناورها می‌تواند هزینه قابل توجهی ایجاد کند.
جوشکاری مکانیزه و خودکار با کاهش زمان اجرای هر اتصال و امکان کنترل بهتر چرخه جوشکاری، می‌تواند به افزایش نرخ تولید و کاهش زمان ساخت کمک کند.
البته سرعت بالاتر نباید به قیمت کاهش کیفیت تمام شود. در پروژه‌های حرفه‌ای، هدف اصلی دستیابی همزمان به سرعت، کیفیت و قابلیت اطمینان است.

۳. کاهش ریسک برای نیروی انسانی
محیط فراساحل با خطراتی مانند ارتفاع، تجهیزات سنگین، شرایط نامساعد جوی، حرکت شناور، فضای محدود و عملیات همزمان متعدد همراه است.
هرچه میزان مداخله مستقیم نیروی انسانی در فرآیندهای تکراری و پرریسک کاهش یابد، امکان کاهش مواجهه کارکنان با برخی خطرات عملیاتی نیز بیشتر می‌شود.

بنابراین، اتوماسیون جوشکاری علاوه بر افزایش بهره‌وری، می‌تواند بخشی از استراتژی ایمنی پروژه‌های فراساحلی باشد.کنترل دیجیتال و ثبت داده‌های جوشکاری یکی از ویژگی‌های مهم سیستم‌های مدرن، صرفاً «خودکار بودن» آنها نیست؛ بلکه قابلیت ثبت و ردیابی داده‌ها است.

در پروژه‌های پیشرفته، اطلاعات مربوط به فرآیند جوشکاری می‌تواند برای هر اتصال ثبت و ذخیره شود. این داده‌ها می‌توانند شامل پارامترهای اصلی جوش، شناسه اتصال، زمان اجرا، اپراتور یا سیستم مورد استفاده و اطلاعات مربوط به کنترل کیفیت باشند.

این رویکرد امکان ایجاد یک سابقه دیجیتال برای هر جوش را فراهم می‌کند.
چنین داده‌هایی در مراحل بعدی برای:

بازرسی و کنترل کیفیت
بررسی انطباق با دستورالعمل جوشکاری

تحلیل عملکرد فرآیند
ردیابی عیوب

مستندسازی پروژه
تعمیر و نگهداری آینده

مدیریت دارایی‌های صنعتی
ارزش قابل توجهی دارند.

نقش WPS و کنترل کیفیت در جوشکاری خطوط لوله

اتوماسیون به‌تنهایی تضمین‌کننده یک جوش سالم نیست. پیش از اجرای عملیات، فرآیند باید بر اساس Welding Proc edure Specification (WPS) یا دستورالعمل مشخصات فرآیند جوشکاری تعریف و کنترل شود.


در پروژه‌های خطوط لوله، عواملی مانند جنس و گرید فولاد، ضخامت دیواره، قطر لوله، طراحی اتصال، نوع فرآیند جوشکاری، فلز پرکننده، پیش‌گرم، دمای بین‌پاسی و عملیات حرارتی احتمالی باید با الزامات فنی پروژه هماهنگ باشند.
after welding نیز بازرسی و آزمون‌های غیرمخرب (NDT) نقش مهمی در ارزیابی سلامت اتصال دارند. بسته به مشخصات پروژه، روش‌هایی مانند Radiography (RT)، آزمون اولتراسونیک (UT)، آزمون آرایه فازی (PAUT) و سایر روش‌های Inspection ممکن است مورد استفاده قرار گیرند.


در واقع، کیفیت واقعی حاصل همکاری سه عامل است:
فرآیند مهندسی‌شده،اجرای کنترل‌شده ، بازرسی و مستندسازی دقیق


چرا اتوماسیون برای خطوط لوله با قطر بزرگ اهمیت بیشتری دارد؟

هرچه قطر و طول خط لوله افزایش پیدا کند، تعداد اتصالات و حجم عملیات نیز بیشتر می‌شود. در چنین پروژه‌هایی حتی یک تفاوت کوچک در کیفیت یا سرعت اجرای هر اتصال، زمانی که در صدها یا هزاران جوش تکرار شود، می‌تواند تأثیر قابل توجهی بر زمان و هزینه نهایی پروژه داشته باشد.برای نمونه، در یک خط لوله ۴۲ اینچی، مدیریت دقیق عملیات اتصال، هم‌راستاسازی، آماده‌سازی لبه‌ها، کنترل پارامترهای جوشکاری و بازرسی اهمیت بسیار بالایی دارد.


به همین دلیل، جوشکاری خودکار خطوط لوله بزرگ‌قطر می‌تواند به کاهش پراکندگی کیفیت و افزایش بهره‌وری در مقیاس پروژه کمک کند.


جوشکاری فراساحلی؛ فراتر از اتصال دو قطعه فولاد
در یک پروژه فراساحلی، جوشکاری صرفاً فرآیند اتصال دو قطعه فلز نیست. هر اتصال باید بخشی از یک سیستم مهندسی‌شده باشد که برای سال‌ها عملکرد ایمن و پایدار آن برنامه‌ریزی شده است.


کیفیت جوش می‌تواند به صورت مستقیم یا غیرمستقیم بر موارد زیر تأثیر بگذارد:


✔️ یکپارچگی سازه‌ای و مکانیکی خط لوله

✔️ قابلیت اطمینان عملیاتی

✔️ ایمنی کارکنان و تجهیزات

✔️ کاهش احتمال نشت و آسیب‌های زیست‌محیطی

✔️ طول عمر و دوام خط لوله

✔️ هزینه‌های تعمیر و نگهداری

✔️ زمان‌بندی و بهره‌وری پروژه


از این منظر، سرمایه‌گذاری روی فناوری‌های جوشکاری خودکار، مکانیزه و دیجیتال تنها یک انتخاب برای افزایش سرعت نیست؛ بلکه بخشی از رویکرد مدرن به مدیریت کیفیت، ایمنی و یکپارچگی دارایی‌های صنعتی محسوب می‌شود.
آینده جوشکاری خطوط لوله؛ حرکت به سوی پروژه‌های هوشمند
مسیر صنعت جوشکاری به سمت اتوماسیون بیشتر، جمع‌آوری داده، پایش لحظه‌ای و یکپارچه‌سازی اطلاعات حرکت می‌کند. در آینده، سیستم‌های جوشکاری می‌توانند بیش از یک دستگاه اجرایی باشند و به بخشی از زنجیره تولید هوشمند و مدیریت دیجیتال پروژه تبدیل شوند.


ترکیب رباتیک، کنترل دیجیتال پارامترها، ثبت داده‌های جوش، بازرسی پیشرفته و تحلیل داده می‌تواند دید دقیق‌تری نسبت به کیفیت واقعی عملیات ایجاد کند.
در پروژه‌های پیچیده فراساحلی، این تحول اهمیت ویژه‌ای دارد؛ زیرا دسترسی به خط لوله پس از نصب بسیار دشوارتر است و پیشگیری از نقص در مرحله ساخت، معمولاً بسیار ارزشمندتر از تعمیر آن پس از بهره‌برداری است.


جوشکاری خودکار در نصب خطوط لوله فراساحلی ترکیبی از فناوری، کنترل فرآیند، مهندسی مواد، بازرسی و مدیریت کیفیت است. در خطوط لوله بزرگ‌قطر مانند خطوط ۴۲ اینچی، هر اتصال جوشی می‌تواند نقش مهمی در عملکرد بلندمدت کل سیستم داشته باشد.
استفاده از سیستم‌های خودکار و مکانیزه، در کنار WPS مناسب، کنترل دقیق پارامترهای جوشکاری، بازرسی‌های غیرمخرب و ثبت دیجیتال داده‌ها، امکان دستیابی به جوش‌هایی یکنواخت‌تر، قابل ردیابی‌تر و قابل اطمینان‌تر را فراهم می‌کند.
در نهایت، در ساخت و نصب خطوط لوله فراساحلی، کیفیت جوش فقط یک شاخص تولید نیست؛ بلکه یکی از پایه‌های اصلی ایمنی، یکپارچگی، حفاظت از محیط زیست و طول عمر یک زیرساخت حیاتی انرژی است.

Welding inspection _ Oil and gas _ TECHNICAL INSPECTION _ پایپینگ


TECHNICAL INSPECTION

Zagros Petrochemical ASU unit construction project; An important step in the development of the domestic capacity of the industrial gases industry

Zagros Petrochemical ASU unit construction project; An important step in the development of the domestic capacity of the industrial gases industry

احداث یکی از بزرگ‌ترین واحدهای تولید اکسیژن کشور

پروژه احداث واحد ASU پتروشیمی زاگرس، یکی از پروژه‌های شاخص در زمینه تولید گازهای صنعتی و توسعه زیرساخت‌های مورد نیاز Petrochemical Industries کشور به شمار می‌رود. This unit aims to provide stable and continuous oxygen Zagros Petrochemical Complex It is designed and implemented and has a special place in the country's industry in terms of production capacity, equipment dimensions and process scope.

واحد ASU یا Air Separation Unit، یک واحد صنعتی برای جداسازی اجزای اصلی هوا و تولید محصولاتی مانند اکسیژن، نیتروژن و آرگون است. In the Zagros Petrochemical Project, the scale of this unit is such that it has become one of the largest oxygen production projects in the country..

Another important point in this project is the extensive use of the engineering and domestic manufacturing capabilities of knowledge-based companies and the capacity of Iranian companies.. The implementation of such a project on this scale, in addition to reducing dependence on foreign equipment and technical knowledge, can be used as a valuable experience and a model for the implementation of similar projects in other industries of the country..

Production capacity of 172 thousand normal cubic meters of oxygen per hour

One of the most important features of Zagros Petrochemical ASU project is its very high oxygen production capacity.

This unit consists of two production phases, the oxygen production capacity of each phase is considered to be about 86 thousand normal cubic meters per hour.. Therefore, the total capacity of two-phase oxygen production is approx: 172 thousand normal cubic meters per hour

it arrives.

 

This significant capacity is especially important for the Zagros Petrochemical Complex; Because the produced oxygen is supposed to be used as one of the main utilities of the complex and provide its process needs in a stable manner..

On such a scale, continuous supply of oxygen is very important. هرگونه اختلال در تأمین گاز اکسیژن می‌تواند بر عملکرد واحدهای فرآیندی اثرگذار باشد؛ بنابراین احداث یک واحد ASU اختصاصی، علاوه بر تأمین ظرفیت مورد نیاز، می‌تواند به افزایش پایداری، قابلیت اطمینان و استقلال عملیاتی مجتمع کمک کند.

ASU چگونه اکسیژن تولید می‌کند؟

واحد جداسازی هوا یا ASU، برخلاف تصور ساده‌ای که ممکن است از عنوان «تولید اکسیژن» ایجاد شود، در واقع اکسیژن را از هوا تولید نمی‌کند؛ بلکه اجزای مختلف موجود در هوا را از یکدیگر جدا و خالص‌سازی می‌کند.

هوای محیط عمدتاً از حدود ۷۸ درصد نیتروژن، ۲۱ درصد اکسیژن و مقدار کمی آرگون و سایر گازها تشکیل شده است. در واحد ASU، این هوا پس از طی چند مرحله فرآیندی، به محصولات مختلفی از جمله اکسیژن، نیتروژن و آرگون تبدیل می‌شود.

در فرآیندهای متداول Cryogenic Air Separation یا جداسازی برودتی هوا، مراحل اصلی معمولاً شامل موارد زیر است:

  • دریافت و فشرده‌سازی هوای محیط
  • تصفیه و حذف رطوبت و ناخالصی‌ها
  • خنک‌سازی عمیق هوا
  • تقطیر برودتی و جداسازی اجزای هوا
  • تولید و خالص‌سازی اکسیژن و نیتروژن
  • جداسازی آرگون
  • ذخیره‌سازی یا ارسال محصولات به واحدهای مصرف‌کننده

در بخش برودتی، دما به محدوده بسیار پایینی می‌رسد تا امکان جداسازی اجزای هوا بر اساس تفاوت در نقاط جوش آنها فراهم شود. نقطه جوش اکسیژن، نیتروژن و آرگون با یکدیگر متفاوت است و همین اختلاف، اساس جداسازی برودتی در ASU را تشکیل می‌دهد.

تولید همزمان اکسیژن، نیتروژن و آرگون

یکی از مزیت‌های مهم واحدهای ASU این است که می‌توانند تنها به تولید اکسیژن محدود نباشند. در کنار اکسیژن، نیتروژن و آرگون نیز می‌توانند به عنوان محصولات فرآیند جداسازی هوا تولید شوند.

در پروژه پتروشیمی زاگرس نیز علاوه بر ظرفیت بسیار بالای تولید اکسیژن، امکان تولید نیتروژن و آرگون مایع پیش‌بینی شده است.

نیتروژن در صنایع مختلف کاربردهای گسترده‌ای دارد و به دلیل ماهیت نسبتاً خنثی آن می‌تواند برای ایجاد محیط بی‌اثر، عملیات Purging، Blanketing مخازن و برخی فرآیندهای صنعتی مورد استفاده قرار گیرد.

آرگون نیز به دلیل واکنش‌پذیری بسیار پایین، یکی از گازهای ارزشمند صنعتی محسوب می‌شود و در صنایعی مانند جوشکاری، متالورژی، صنایع فولاد، ساخت تجهیزات خاص و برخی فرآیندهای حساس کاربرد دارد.

به این ترتیب، واحد ASU علاوه بر تأمین اکسیژن مورد نیاز مجتمع، می‌تواند یک زیرساخت مهم برای تولید چند گاز صنعتی با ارزش باشد.

 

نقش اکسیژن در پتروشیمی زاگرس:

اهمیت این پروژه زمانی بیشتر مشخص می‌شود که نیازهای عملیاتی یک مجتمع بزرگ پتروشیمی را در نظر بگیریم.

پتروشیمی زاگرس یکی از مجتمع‌های بزرگ تولید متانول است و فرآیندهای آن به تأمین پایدار یوتیلیتی‌های مختلف نیاز دارند. اکسیژن تولیدشده در واحد ASU، برای استفاده به عنوان یوتیلیتی مورد نیاز مجتمع در نظر گرفته شده است.

در واحدهای صنعتی با ظرفیت بالا، تأمین گازهای فرآیندی از منابع بیرونی می‌تواند وابستگی‌هایی در زمینه ظرفیت انتقال، قیمت، حمل‌ونقل و استمرار تأمین ایجاد کند. احداث واحد ASU در محل مجتمع، این امکان را فراهم می‌کند که اکسیژن مورد نیاز به صورت مستمر و متناسب با نیاز فرآیندی در دسترس باشد.

از این منظر، پروژه ASU تنها یک واحد تولید گاز صنعتی نیست؛ بلکه بخشی از زیرساخت حیاتی برای افزایش پایداری زنجیره تولید مجتمع محسوب می‌شود.

چرا احداث ASU در مقیاس بزرگ اهمیت دارد؟

احداث یک واحد جداسازی هوا در مقیاس صنعتی بزرگ، نیازمند دانش و فناوری در حوزه‌های مختلف مهندسی است. طراحی چنین واحدی مجموعه‌ای از تخصص‌ها را دربرمی‌گیرد؛ از جمله:

  • مهندسی فرآیند
  • مهندسی مکانیک
  • مهندسی برق و ابزار دقیق
  • سیستم‌های کنترل صنعتی
  • تجهیزات برودتی و Cryogenic
  • کمپرسورها و تجهیزات دوار
  • مبدل‌های حرارتی
  • تجهیزات انتقال و ذخیره‌سازی گازهای صنعتی
  • سیستم‌های ایمنی و حفاظت فرآیندی

یکی از حساس‌ترین بخش‌های ASU، سیستم برودتی و تجهیزات مرتبط با دماهای بسیار پایین است. عملکرد صحیح مبدل‌های حرارتی، ستون‌های تقطیر، کمپرسورها، شیرهای کنترلی و سیستم‌های ابزار دقیق در این بخش، نقش تعیین‌کننده‌ای در راندمان و پایداری واحد دارد.

همچنین کیفیت هوای ورودی اهمیت زیادی دارد. پیش از ورود هوا به بخش برودتی، باید ناخالصی‌هایی مانند رطوبت و دی‌اکسیدکربن تا حد زیادی حذف شوند؛ زیرا تجمع این مواد در دماهای بسیار پایین می‌تواند باعث مشکلات عملیاتی و اختلال در تجهیزات برودتی شود.

یک پروژه با اتکا بر توان مهندسی و ساخت داخل

یکی از جنبه‌های برجسته پروژه احداث واحد ASU پتروشیمی زاگرس، تکیه بر توان داخلی و ظرفیت شرکت‌های دانش‌بنیان ایرانی است.

اجرای پروژه‌ای با چنین ظرفیت و پیچیدگی، نشان‌دهنده رشد توان کشور در زمینه طراحی، مهندسی، ساخت، تأمین تجهیزات و اجرای پروژه‌های بزرگ صنعتی است.

توسعه این توانمندی اهمیت زیادی دارد؛ زیرا فناوری‌های مرتبط با تولید گازهای صنعتی، تجهیزات برودتی، کنترل فرآیند و تجهیزات دوار، از بخش‌های تخصصی صنعت محسوب می‌شوند.

تجربه به‌دست‌آمده از اجرای این پروژه می‌تواند در آینده برای توسعه واحدهای مشابه در صنایع پتروشیمی، فولاد، پالایشگاه‌ها، صنایع معدنی و سایر صنایع بزرگ مصرف‌کننده گازهای صنعتی مورد استفاده قرار گیرد.

ASU؛ فراتر از یک واحد تولید اکسیژن

نگاه دقیق‌تر به پروژه پتروشیمی زاگرس نشان می‌دهد که ASU را نباید صرفاً یک «واحد تولید اکسیژن» دانست.

این واحد در واقع یک مجموعه پیچیده برای جداسازی، خالص‌سازی و تولید محصولات مختلف از هوای محیط است که عملکرد آن به مجموعه‌ای از تجهیزات فرآیندی، مکانیکی، برودتی، الکتریکی و کنترلی وابسته است.

ظرفیت حدود ۱۷۲ هزار نرمال مترمکعب اکسیژن در ساعت در دو فاز، در کنار تولید نیتروژن و آرگون مایع، مقیاس قابل توجه این پروژه را نشان می‌دهد.

از سوی دیگر، قرار گرفتن این واحد در کنار یک مجتمع بزرگ تولید متانول، اهمیت تأمین پایدار اکسیژن و سایر گازهای مورد نیاز فرآیند را دوچندان می‌کند.

گامی برای توسعه پروژه‌های بزرگ صنعتی در ایران

پروژه احداث واحد ASU پتروشیمی زاگرس را می‌توان نمونه‌ای از حرکت صنعت کشور به سمت توسعه فناوری، بومی‌سازی تجهیزات و استفاده از توان شرکت‌های مهندسی و دانش‌بنیان داخلی دانست.

اجرای چنین پروژه‌ای می‌تواند علاوه بر تأمین نیازهای عملیاتی پتروشیمی زاگرس، دانش و تجربه ارزشمندی برای پروژه‌های آینده ایجاد کند. این موضوع به‌ویژه در شرایطی اهمیت دارد که صنایع بزرگ کشور برای افزایش ظرفیت تولید، کاهش وابستگی و ارتقای پایداری عملیاتی به فناوری‌های بومی و زنجیره تأمین داخلی نیاز دارند.

 

پروژه احداث واحد ASU پتروشیمی زاگرس یکی از پروژه‌های مهم در حوزه تولید و تأمین گازهای صنعتی کشور است که با ظرفیت بالای تولید اکسیژن و تولید همزمان نیتروژن و آرگون، نقش مهمی در تأمین یوتیلیتی مورد نیاز مجتمع پتروشیمی زاگرس خواهد داشت.

ظرفیت تولید ۸۶ هزار نرمال مترمکعب اکسیژن در ساعت برای هر فاز و مجموع ۱۷۲ هزار نرمال مترمکعب در ساعت، مقیاس بزرگ این پروژه را نشان می‌دهد. در کنار این ظرفیت، استفاده از توان شرکت‌های داخلی و دانش‌بنیان، این پروژه را به تجربه‌ای قابل توجه در زمینه اجرای پروژه‌های پیچیده صنعتی در داخل کشور تبدیل کرده است.

شرکت مهندسی صنعتی فهامه مفتخر است که در این پروژه (جداسازی هوا) به عنوان پیمانکار انجام خدمات بازرسی فنی کالا و تجهیزات طرح ساخت ASU که توسط سازندگان و فروشندگان داخلی و خارجی ساخته یا تامین میگردد، مشارکت و همکاری دارد.

 

Oil, gas, petrochemical and refinery _ TECHNICAL INSPECTION _ Inspection during construction _ Welding inspection


vehicles inspection

wooden car carriers; The beginning of an engineering revolution in vehicle transportation

wooden car carriers; The beginning of an engineering revolution in vehicle transportation

Nowadays, the simultaneous transportation of several cars from car factories to distribution centers and dealers is an important part of the supply chain of the car industry.. Modern car carriers with steel or aluminum structures, high capacity, safety systems and specialized equipment, the possibility of moving a large number car provide in long distances. But this advanced technology is the result of a long path of engineering and logistics innovation.

One of the interesting stages of this path was the emergence of wooden-framed car carriers in the middle of the 20th century; At a time when the US auto industry was rapidly moving toward mass production, the issue of getting manufactured cars to market quickly and economically became even more important..

Why were wooden car carriers formed?

expansion Mass production of cars It meant that factories could produce a large number of cars in a short period of time; But production was only one part of the process. The manufactured cars had to be transported from the factory to warehouses, distribution centers and dealers with speed, reasonable cost and minimum damage..

In such a situation, the design of a system Car transport It became very important with more capacity. Using trucks with a suitable chassis and installing multi-story or reinforced wooden structures on them was one of the practical solutions of that time..

wood Compared to many metal materials used in heavy structures, it weighed less and, more importantly, could be made, repaired, and modified with relatively simple tools.. This feature was considered an important advantage for the transport fleet at that time.

On the other hand, the relatively flexible nature of the wood could absorb some of the vibrations and shocks caused by the truck's movement; A subject that for Carrying new cars And it was important to prevent damage to the body and its components.

A simple solution to a big problem

Although Wooden car carriers از نظر فناوری با خودروبرهای امروزی قابل مقایسه نیستند، اما ایده اصلی آن‌ها بسیار مهم بود: افزایش بهره‌وری حمل خودرو بدون افزایش متناسب تعداد کامیون‌ها و سفرها.

In other words, instead of each truck carrying only one car, the structure was designed in such a way that it would be possible to carry several cars in one trip..

This simple change had important implications in automotive logistics:

  • Increased carrying capacity per trip
  • Reduce the number of trips required
  • Reducing the cost of transporting each vehicle
  • Shortening the time to transfer the car from the factory to the market
  • Increasing the speed of car distribution in the dealer network
  • More effective use of transport fleet capacity

In fact, the primary car carriers can be considered as one of the significant examples of industrial logistics optimization; Because they used a simple engineering principle without relying on electronic systems or sophisticated equipment today: Increasing the productivity of the existing capacity.

How did the wooden structure become a car carrier?

The structure of these carriers was usually based on the truck chassis. On the chassis, a framework of beams and reinforced wooden parts was created, whose main task was to create suitable surfaces for placing cars and transferring the load to the chassis..

In such a structure, it was not just about bearing the weight of cars. Engineers and builders had to consider factors such as load distribution, center of gravity, structural stability, road vibrations, connection points and dynamic forces..

Especially when the cars were higher off the ground, the increased height of the center of mass could affect the stability of the vehicle in turns and when changing lanes.. Therefore, the design of the structure and the placement of cars was part of a real problem of mechanical and transportation engineering.

Also, the contact points between the car and the structure should be designed in such a way that while keeping the car stable, the possibility of damage to the tires, chassis, suspension system or body is reduced..

Why was wood the right choice despite the limitations?

Wood was not an ideal material for all situations, but it had important advantages during that period.

Low weight, easy access, machinability, repairability, and relatively reasonable cost were considered its most important advantages.. A damaged piece of wood could be replaced or reinforced with standard workshop tools; While the construction or repair of some metal structures required more specialized equipment.

However, wood had serious limitations against moisture, decay, temperature changes, fire, and mechanical wear.. Also, its performance depended on the quality of the wood, the direction of the fibers, the way the parts are connected, and the environmental conditions.

out of sight Engineering structure, this issue is very important; Because the load bearing capacity of a wooden member is not only dependent on its dimensions, and factors such as the type of wood, humidity, loading method and the quality of connections are also influential in its performance..

 

From wooden car carriers to modern metal structures

With growth Transportation industry and increase in weight and dimensions cars, the need for more resistant, safer and higher capacity vehicles increased.

در ادامه، سازه‌های فلزی به تدریج جایگاه مهم‌تری پیدا کردند. Steel made it possible to create structures with high strength and more accurate geometry, and later, the use of lighter alloys such as aluminum also helped to reduce the weight of the structure and increase the useful carrying capacity..

Today's modern car carriers are the result of this evolutionary process. In their design, in addition to carrying capacity, things like:

  • The strength and rigidity of the chassis
  • Weight distribution and axial load
  • Center of gravity and stability
  • Resistance to fatigue
  • Vehicle restraint systems
  • Loading ramps
  • Proper distance between cars
  • Safety during braking and changing direction
  • Resistance of the structure to environmental conditions

They are examined in a specialized way.

Therefore, we can see an engineering evolutionary line between the wooden car carrier and the modern car carrier; A line that started with simple and low-cost solutions and reached today's light, resistant, multi-story and engineered structures..

The role of car carriers in the supply chain of the automotive industry

Transporting a car is not just a simple moving operation. In the automotive industry, shipping time and cost can affect the entire supply chain.

A car that leaves the production line but does not reach its destination at the right time, practically stops a part of the company's capital in the logistics network.. For this reason, car transportation and car fleet management is considered an important part of the supply chain planning of car manufacturers and car distribution companies..

Early car carriers also aimed at the same issue in their time scale: Transporting more cars in less time and at lower cost.

Interesting point; A simple innovation with a big impact

Wooden carriers may seem very simple compared to today's equipment, but their historical significance was not in the complexity of the technology; Rather, it was in solving an industrial problem using available resources and technologies.

These vehicles show that engineering innovation does not always mean using the most advanced materials and technologies. گاهی یک تغییر در طراحی سازه و افزایش ظرفیت حمل می‌تواند تأثیری بسیار بزرگ بر اقتصاد یک صنعت داشته باشد.

در واقع، خودروبرهای چوبی را می‌توان بخشی از روندی دانست که به تدریج حمل خودرو را از یک فعالیت ساده حمل‌ونقلی به یک سیستم تخصصی لجستیک خودرو تبدیل کرد.

جمع‌بندی

خودروبرهای چوبی، یکی از نمونه‌های جالب تحول در مهندسی حمل‌ونقل And لجستیک صنعت خودرو Are. این سازه‌ها در دوره‌ای که تولید انبوه خودرو با سرعت زیادی در حال توسعه بود، راهکاری ساده و نسبتاً اقتصادی برای افزایش ظرفیت حمل ارائه کردند.

Although wood به دلیل محدودیت‌هایی مانند حساسیت به رطوبت، فرسودگی و ظرفیت محدود، در نهایت جای خود را به سازه‌های فلزی و سپس طراحی‌های سبک و مهندسی‌شده امروزی داد، اما نقش آن در مسیر تکامل خودروبرها، Car transport And زنجیره تأمین خودروسازی قابل توجه است.

از یک سازه چوبی ساده روی شاسی کامیون تا خودروبرهای چندطبقه و پیشرفته امروزی، یک اصل ثابت باقی مانده است: حمل بیشتر، سریع‌تر، ایمن‌تر و اقتصادی‌تر.

همین اصل، یکی از پایه‌های شکل‌گیری و توسعه لجستیک مدرن automotive industry در قرن بیستم و پس از آن بود.

 

Vehicle inspection _ واردات خودرو _ Standardization _ Confirmation of vehicle type


GOODS INSPECTION

Import and export goods inspection companies

کنترل عملیات لاشینگ کانتینرها (Container Lashing Control)

Lashing is a set of actions that are taken to restrain and stabilize containers on a ship or trailer so that they do not move against the force of wind, waves, vibration, acceleration, braking and dynamic movements..

Accurate control of this operation is one of the most sensitive tasks in safety It is sea and port transportation.

۱. Inspection before starting work

Checking the health of lashing bars, screws, hooks and rods

Ensure no rust, cracks or deformation

Compliance of equipment with IMO standards and ship class

 

۲. Checking the arrangement of containers

Ensuring the correct placement of containers on the shelves

Control of Twist Locks (Correct lock and unlock)

Checking the center of gravity, elevation and dangerous loads (DG Cargo)

 

۳. Execution of lashing according to the loading plan (Stowage Plan)

Fastening and tension adjustment of rods, turnbuckles and bridgefits

Adhering to the proper angle of restraint (Usually 30 to 60 degrees)

Using standard equipment with capacity (SWL) suitable

 

۴. Final control after completing the operation

Checking the uniformity of the stiffness of the restraints

Make sure there are no loose or loose points

Record operations in the ship's logbook or PMS system

Reporting to Chief Officer or Cargo Supervisor

 

۵. Periodic monitoring during the trip

Scheduled visit when the sea state changes.

Retightening lashings in Sea Passage or when entering rough waters.

Accurate lashing, especially in new generation container ships that load up to 10-12 containers high, is one of the key factors of stability, safety and preservation of cargo value. Without proper control, the smallest error can lead to major accidents.:

Container falling into the sea

Damage to the ship's hull or surrounding structures

Creating large insurance losses

Shifting cargo and disturbing the balance of the ship

Danger to crew and equipment on deck

 

Import goods inspection services:

  • Pre-shipment inspection (PSI) in the country of origin
  • Quality control, quantity, packaging, marking and compliance with the purchase order.
  • Sampling and testing
  • Physical, chemical, mechanical and functional tests according to reference standards.
  • Control of import documents
  • Invoice, packing list, bill of lading, certificate of origin, COA/COC, compliance with Incoterms .
  • Issuance of inspection certificate (COI/IC)
  • Required by banks, insurance and customs.
  • Inspection at destination
  • Discharge monitoring, counting, damage checking and deficit/defect reporting.

 

Unloading bulk containers (Bulk Containers Unloading)

evacuation Bulk containers to the process of exiting bulk materials (Powder, granular or granular) It is said from the container without separate packaging. This operation is carried out in ports, silos and logistics centers with the aim of speed, safety and reducing product loss.

Common methods of unloading bulk containers:

Gravity discharge (Gravity Discharge)

Evacuation with mechanical equipment

Pneumatic discharge (Pneumatic Unloading)

Tilt or overturn Container (Container Tilter)

This unloading method is used for bulk items such as grain and animal feed, cement and minerals, powdered chemicals and polymer granules..

 

GOODS INSPECTION، Pre-shipment inspection،Inspection at source،Standard inspection