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Regular inspection content for pressure vessel manufacturers

Classification: Industry Information

Time2024-08-21

In order to ensure the safe operation of pressure vessels and avoid various accidents, the units using pressure vessels must strictly implement the regular inspection system for pressure vessels. Each time a regular inspection is conducted, the inspection plan must be submitted to the local regulatory department, allowing the relevant departments to supervise the inspection work.

What contents are checked for pressure vessels?

       In order to ensure the safe operation of pressure vessels and avoid various accidents, the user unit of the pressure vessel must strictly implement the regular inspection system for pressure vessels. Each time a regular inspection is conducted, the inspection plan must be submitted to the local regulatory department, allowing the relevant department to supervise the inspection work.

1. External Inspection

       Also known as in-service inspection, the main contents of the inspection include: checking for cracks, deformation, leaks, local overheating, and other abnormal phenomena on the outer surface of the pressure vessel; ensuring that safety accessories are complete, sensitive, and reliable; checking that all fastening bolts are intact and fully tightened; and inspecting for any subsidence, tilting of the foundation, and damage to the anti-corrosion layer. External inspection is both the responsibility of the inspection personnel and a routine inspection item for operating personnel. If any safety-threatening phenomena are found (such as cracks, deformation, or severe leakage in pressurized components), the operation should be stopped and relevant personnel should be notified promptly.

2. Internal and External Inspection

       The internal and external inspection of pressure vessels must be conducted after the vessel has been shut down and cleaned internally. The main contents of the inspection include all items from the external inspection, as well as checking for corrosion and wear on internal and external surfaces; visually inspecting all welds, transition areas of the end caps, and other stress concentration points for cracks using the naked eye and magnifying glass, and if necessary, using ultrasonic or radiographic testing to check the internal quality of the welds; measuring wall thickness. If the measured wall thickness is less than the minimum wall thickness of the vessel, a strength recalculation should be performed, and measures for reduced pressure use or repairs should be proposed; for vessels that may cause metallurgical changes in the metal materials, metallographic inspection should be conducted if necessary; the main bolts of high-pressure and ultra-high-pressure vessels should be checked for cracks using magnetic powder or dye. Through internal and external inspections, any identified defects should be analyzed for causes and treatment suggestions should be provided. After repairs, re-inspection is required. The internal and external inspection cycle for pressure vessels is once every three years, but for vessels containing highly corrosive or highly toxic media, the inspection cycle should be shortened. Vessels found to have serious defects during operation, as well as those with poor welding quality or unclear corrosion resistance of materials, should also have their inspection cycles shortened.

3. Comprehensive Inspection

       Pressure VesselIn addition to the above inspection items, comprehensive inspections also include pressure tests (generally conducted as hydrostatic tests). Non-destructive testing should be conducted on major welds, either through random sampling or complete inspection of all welds. However, for vessels containing very low pressure, non-flammable, non-toxic, and non-corrosive media, if no defects are found and a certain amount of operational experience is obtained, non-destructive testing may not be required. The cycle for comprehensive inspections of vessels is generally at least once every six years. For qualified vessels containing air and inert gases, the cycle for comprehensive inspections may be appropriately extended after obtaining operational experience and confirming no corrosion through one or two internal and external inspections.

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