Safety Valve Safety Technology Supervision Procedure

I. Supervision Regulations for Safety Technology of Steam Boilers Promulgated by the Supervision Bureau of Boiler and Pressure Vessels of the Bureau of Quality Supervision Article 146 “The safety valves of boilers in use shall be verified at least once a year. The check of safety valves shall generally be carried out under the operating conditions of the boiler. II. Regulations for the Inspection of Pressure Vessels for Power Industry Boilers (DL612-1996) issued by the Ministry of Electric Power Industry 9.3.13 The starting pressure of the safety valve shall be verified after the boiler is installed and overhauled and the safety valve has been overhauled. . Electromagnetic safety valves with electromagnetically assisted operating mechanisms, in addition to mechanical verification, should also perform remote operational tests of electrical circuits and operational tests of automatic circuit pressure relays. Purely mechanical spring type safety valve can be calibrated and adjusted by hydraulic device, generally under 75%～80% rated pressure. After the adjustment of the safety valve by the hydraulic device, at least the actual seating check of the safety valve with low seating value shall be performed. 9.1.14 Safety valves shall be subjected to steam release tests on a regular basis. Boiler safety valve test interval is not greater than a minor repair interval. Electromagnetic safety valve electrical circuit test should be performed once a month. Safety valves for all types of pressure vessels are tested for steam release at least once a year. 9.1.15 It is forbidden to release the safety valve during boiler operation. 9.1.16 The uncalibrated boiler of the safety valve shall be strictly prevented from overpressure during the ignition start-up and during the verification of the safety valve, and shall be carried out under the supervision of a special person. In the verification of the safety valve, the verification personnel shall not withdraw from the site halfway. Third, the power company has promulgated the "25 major requirements for prevention of major accidents in power production," the provisions of: 3.2.1 prevent boiler water shortage and over-temperature overpressure operation, is strictly prohibited in the water table is insufficient (refers to the correct indication The number of water level gauges) and the status of the safety valve are released. 3.2.4 The boiler overpressure hydraulic pressure test and safety valve setting shall be strictly in accordance with the regulations. 3.2.4.1 The overpressure hydraulic pressure test and thermal safety valve verification work for large-capacity boilers shall be developed with special safety technical measures to prevent overpressure and over-temperature phenomena caused by excessive boost pressure or uncontrolled pressure and steam temperature. 3.2.4.2 When non-testing personnel are allowed to enter the test site during the overpressure hydrostatic pressure test and hot relief valve timing. ”