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Boiler safety valve setting measures
First, the preparation before the safety valve adjustment: 1, the appearance of the safety valve inspection. Look for cracks, and then analyze the material of its various components should meet the design requirements. Check the safety valve body around the welding port, screw connection at any abnormal situation, such as welding mouth cracks and screws do not meet the specifications, should be handled in advance. 2, drums, superheater on-site manometer and digital pressure gauge calibration (local pressure gauge can be installed in the adjustment of the standard pressure gauge). 3, ready to debug tools and communication tools (such as telephone, walkie-talkie, etc.). 4, ignition exhaust valve and accidental discharge door should be tested normally easy to use. Second, the provisions of the safety valve pressure relief valve safety valve to determine the basis for the pressure is determined according to "power plant technical standards" in the construction and acceptance of power construction specifications (boiler unit articles), take 1.04 times the working pressure to control the safety valve Action pressure, take 1.06 times the working pressure of the working pressure relief valve work, opening and closing pressure Kai Kai Kai pressure of 4% -7%, the maximum does not exceed 10%. 3.82 × 1.04 = 3.97MPа Return Seat Pressure: 3.81-3.69 MPа Minimum 3.58 MPа Superheater Working Safety Valve Opening Pressure: 3.82 × 1.06 = 4.05 MPа Return Seat Pressure: 3.88-3.77 MPA Low 3.64 MPа drum control relief valve Kai seat pressure: 4.3 × 1.04 = 4.47 MPа (left and right of each one) Seat pressure: 4.29-4.16 MPа minimum 4.02 MPа drum bag safety valve Kai seat pressure: 4.3 × 1.06 = 4.56 MPа back Seat pressure: 4.38-4.23 MPа minimum 4.10 MPа Third, the boiler can operate directly after the safety valve setting work, the tuning sequence: 1, drum safety valve 2, drum control valve 3, superheater outlet header Work safety valve 4, superheater outlet header control safety valve IV, setting method: 1, the non-adjusted safety valve with the plunger (or compression nut) crushed to death. 2, before setting the ignition exhaust valve by electric control switch to manual control at the scene. 3, adjust the combustion and ignition exhaust valve control steam pressure, so that the slow rise, when the pressure close to the action pressure, should maintain pressure stability, slowly rise to the setting pressure, such as more than Kai pressure does not open seat, you should promptly open the ignition row Steam valve to reduce the boiler steam pressure, or use the handle on the stem to force the exhaust pressure relief Kai Kai pressure, re-test row. 4, after the seat, to monitor the pressure back to seat, easy to adjust the pressure back to seat. 5, when the pressure meets the requirements, do a test row. 6, after adjusting one, then adjust the next one. Fifth, other requirements: 1, air pressure exhaust valve can be used to adjust. 2, close to the pressure Kai, be sure to slowly boost. 3, safety valve adjustment, should be strengthened on the steam temperature, steam pressure and water level monitoring, adjustment should be careful to minimize the number of single safety valve action. 4, the safety valve to adjust the pressure to local pressure gauge shall prevail, the pressure of its Kai-Kai, back seat pressure, should be carefully detailed record. 5, to ensure that the furnace personnel and control room staff communication links. Sixth, safety precautions: 1, before setting, to check the exhaust pipe installation and support situation. 2, safety valve office to set up a temporary platform. 3, before the safety valve is adjusted, it must be run under pressure for some time after the seatback. 4, to participate in adjusting personnel should have anti-noise earplugs and other measures. 5, adjust the safety valve, it should be a comprehensive inspection of the safety valve system is installed correctly, the exhaust pipe installation is solid, whether the impact of expansion. 6, before adjusting the safety valve, all aerial work in the plant should be stopped, non-staff may not enter the roof, but also can not close to the exhaust pipe. 7, the safety valve where the road should be open, adequate lighting, reliable communication and communication facilities, where there are temporary scaffolding must have railing to prevent falling accident at height to ensure personal safety, safety valve adjustment process, such as an accident, Should stop the calibration work. Seven, calibration work arrangements: calibration test work by the operation of the workshop, the operation of the workshop is responsible for the operation, record and on-site contact work, maintenance workshop is responsible for the adjustment of the safety valve, the production department on-site guidance. Search Keyword: More Valve Technical Articles Valve Products Supply Information