【Daily Question】In-depth Processing 20160815 Short Answer Question: How is the inspection cycle for pressure vessels specified?
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In accordance with the national regulations for regular inspection of pressure vessels, the initial inspection cycle is three years, followed by cycles of three to six years.
The comprehensive inspection cycle for safety status levels 1 and 2 is once every 6 years. Regarding the comprehensive inspection cycle for safety status rated at level 3, the \"Inspection Regulations\" specify that it should be carried out \"once every 3 to 6 years on average\". The reasons for the revision are the same as before. Regarding the regulation on the comprehensive inspection cycle for safety status levels 4, the Inspection and Acceptance Regulations stipulate additionally that \"the inspection cycle shall be determined by the inspection agency.\" Article 6 of the Regulations on Inspection and Testing stipulates that the cumulative monitoring period shall not exceed 3 years; generally, a comprehensive inspection should be carried out at least once within this 3-year cumulative monitoring limit.
Depending on the classification level of the pressure vessel, the inspection cycle also varies!
How is the regular inspection cycle for pressure vessels specified? Answer: It is stipulated as follows: for items with a safety status rating of 1 or 2, the comprehensive inspection cycle is once every 6 years. Regarding the comprehensive inspection cycle for safety status rated at level 3, the \"Inspection Regulations\" specify that it should be carried out \"once every 3 to 6 years on average\". The reasons for the revision are the same as before. Regarding the regulation on the comprehensive inspection cycle for safety status levels 4, the Inspection and Acceptance Regulations stipulate additionally that \"the inspection cycle shall be determined by the inspection agency.\" Article 6 of the Regulations on Inspection and Testing stipulates that the cumulative monitoring period shall not exceed 3 years; generally, a comprehensive inspection should be carried out at least once within this 3-year cumulative monitoring limit.
Pressure vessels should generally undergo their first periodic inspection within 3 years of being put into use. For the next inspection cycle, the inspection agency shall determine it in accordance with the following requirements, based on the safety condition grade of the pressure vessel: (1) For vessels with a safety condition grade of 1 or 2, inspections are generally carried out every 6 years ； (2) For those with a safety status level of 3, inspections are generally carried out every 3 to 6 years ； (3) Those with a safety status rating of 4 shall be monitored during use, and their inspection cycle shall be determined by the inspection agency; the cumulative monitoring period shall not exceed 3 years ； (4) For those with a safety status level of 5, the defects must be addressed; otherwise, they shall not be used any further ； (5) The evaluation of the safety condition grade of pressure vessels is carried out in accordance with the \"Rules for Periodic Inspection of Pressure Vessels\"; if the specified conditions are met, the inspection interval may be appropriately shortened or extended ； (6) For pressure vessels applying risk-based inspection (RBI) technology, the inspection interval shall be determined in accordance with the requirements of 7.8.3 of these regulations. Safety valves should generally be calibrated at least once a year, while pressure gauges should be checked at least once every six months, in accordance with the \"Rules for Periodic Inspection of Pressure Vessels\"
TSG 21‑2016 contains very detailed regulations for the inspection of pressure vessels
External devices: 1 year; the container body: 6 years to 3 years, depending on the safety grade of 1, 2, or 3
According to the classification of pressure vessels
Pressure vessels must be inspected at least once a year, an internal inspection is carried out every three years, and a comprehensive inspection is done in the sixth year.