Answer: Safety accessories should be subject to a periodic inspection system. The periodic inspection of safety accessories shall be carried out in accordance with the provisions of the "Regulations on Inspection of In-use Pressure Vessels". If the "Regulations on Inspection of In-use Pressure Vessels" does not provide for it, the inspection unit shall propose an inspection plan and submit it to the provincial safety supervision agency for approval.
(1) Safety valves should generally be calibrated at least once a year. When it is difficult to disassemble and calibrate, on-site calibration (online calibration) should be adopted.
(2) Bursting disc devices should be replaced regularly. Bursting discs that exceed the maximum design bursting pressure but do not explode should be replaced immediately; Bursting disc devices used under harsh conditions should be replaced every year; Generally, bursting disc devices should be replaced within 2 to 3 years (except for those whose service life can be extended by the manufacturer). Pressure gauges and temperature measuring instruments should be calibrated according to the period specified by the user.
(3) The calibration unit of the safety valve should have calibration technicians, calibration devices, instruments and sites suitable for the calibration work, and establish necessary rules and regulations. The inspectors shall have basic knowledge of safety valves, be familiar with and be able to implement the relevant regulations and standards for safety valve inspection, and be certified to work. The inspection work shall be recorded in detail. After the inspection is qualified, the inspection unit shall issue a inspection report and install lead seals on the qualified safety valves.
