The pressure vessel has exceeded its designed service life
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Dear all powerful experts: Hello everyone! At present, equipment that has exceeded its design service life for pressure vessels (with a maximum of 20 years) can continue to be used after passing the inspection in accordance with Article 7.1.7 of the TGS21-2016 \"Regulations on Safety Inspection of Fixed Pressure Vessels\" ； However, under item ‘IV, 13’ of the plan in [Su Ban [2019] No. 96], it is stated that ‘enterprise intrinsic safety requirements should be strengthened.’ ……Resolutely phase out high-risk chemical equipment and facilities that have exceeded their service life” ； At present, any on-site replacement is carried out in accordance with the procedures for new construction, redesign, and long-term special-class hot work ； There’s basically no possibility of implementing it! How do ordinary petrochemical companies and large state-owned petrochemical enterprises, as well as central state-owned enterprises, implement this standard? (Especially the petrochemical enterprises in Jiangsu) Thank you very much!
I’m also eager to know about this; thanks to the original poster for raising it
The design life of equipment is determined based on the degree of corrosion of the materials by the medium. For example, in the case of carbon steel equipment in water, an allowance of 0.5 mm per year is taken into account; this value is combined with the intended design life. The wall thickness must be increased by this corrosion allowance over the calculated thickness. Currently, manufacturers generally assume a design life of 8 years.
Yes, it can be found in this professional material； The main issue now is that it does not meet the **file requirements (I’d like to know how large companies handle this situation)
It seems that most of the newly designed pressure vessels no longer have a limit on their service life; as long as they pass the inspections conducted by the specialized inspection agencies, they are considered to meet the regulations. Of course, if the property owner believes there are risks associated with use, they can hire a professional agency to conduct an assessment.
Currently, it is mainly various laws that require stricter standards than those set by different regulations, and there is no clear way to reconcile this situation!