چکیده مقاله
This research investigates and evaluates Fitness For Service FFS assessments to achieve a comprehensive understanding of the re serviceability of damaged equipment in the oil, gas, and petrochemical industries One of the challenges faced by these industries is the occurrence and development of weld misalignment, which leads to fatigue damage in pressure equipment Pressure vessels, storage tanks, and piping systems degrade over long service periods, ultimately affecting the system's integrity Under such conditions, implementing FFS assessments to evaluate structural integrity, extend the life of defective equipment, and estimate remaining service life becomes essential If equipment exhibits weld misalignment or shell distortion, particularly when accompanied by gouges or crack like flaws, conducting a Level 3 assessment is necessary to confirm its fitness for continued operation In these scenarios, in service monitoring is typically mandatory For equipment suffering from weld misalignment, loss of circularity out of roundness , or local bulges, stiffening plates and lap patches can be used to reinforce the structure The choice of reinforcement depends on the equipment's geometry, temperature conditions, and loading state Reinforcement must be designed based on the principles and allowable stresses defined in the equipment's original construction code Adhering to these requirements ensures the reinforcement is compatible with the original structure and that the equipment's safe operational capability is maintained In sections of cylindrical shells that have lost their circular shape, mechanical methods can be used to restore them within the original fabrication tolerances or to a geometry that reduces local stresses to acceptable limits The use of hydraulic jacks for reshaping stiffened cylindrical shells has yielded successful results The reshaping process must be carried out under careful monitoring and control to minimize the risk of damage to the shell or adjacent connections This method enables the restoration of the structure's geometry to an acceptable condition and can serve as a practical solution for extending remaining life and reducing failure risk In service monitoring is a key tool for ensuring the safety, operability, and remaining life of pressure equipment This process involves a set of activities and methods for continuously or periodically inspecting the equipment's condition under real operational circumstances The conducted FFS assessments have resulted in cost savings, prevention of unnecessary component repairs, reduction in the likelihood of sudden system shutdowns, and enhanced safety for industrial personnel
کلیدواژهها
نویسندگان
Mohammad Mobin Javaheri
M Sc Candidate in Materials Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
Farzad Pahnaneh
Ph D Holder in Materials Engineering and Metallurgy, Fan Foolad Sabin Knowledge Based Company, Kermanshah, Iran
Shahab Zangeneh
Assistant Professor, Department of Materials and Textile Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
شیوه ارجاع
Javaheri, Mohammad Mobin and Pahnaneh, Farzad and Zangeneh, Shahab,1404,Evaluation of Weld Misalignment in Pressure Vessels and Pipelines Based on Fitness-for-Service Assessments in Accordance with API 579- 1/ASME FFS-1,8th International Conference on Welding and Non Destructive Testing & 26th National Conference on Welding & Inspection & 15th National Conference on NDT & 4th National Conference on Additive Manufacturing,Tehran
ارائهشده در
مجموعه مقالات هشتمین کنفرانس بین المللی جوشکاری و آزمایش های غیرمخرب، بیست و ششمین کنفرانس ملی جوش و بازرسی، پانزدهمین کنفرانس ملی آزمایش های غیرمخرب و چهارمین کنفرانس ملی ساخت افزایشی20 بهمن 1404 · تهران