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Installation requirements of safety valve for oil and gas fired boiler

2019 / 1 / 22 18:41:42 Click:
Installation requirements of safety valve for oil and gas fired boiler


The safety valve is one of the important protection devices for oil and gas-fired boilers. It is necessary for the boiler users to understand the correct installation of the safety valve. The following small series will talk about the installation requirements of safety valves for oil and gas fired boilers:
(1) at least two safety valves shall be installed for oil and gas boilers with rated evaporation capacity greater than 0.5t/h, and at least one safety valve shall be installed for oil and gas boilers with rated evaporation less than or equal to 0.5t/h. Safety valves shall be installed at the outlet of separable economizer and steam superheater.
(2) the safety valve shall be installed vertically at the higher position of boiler drum and header. Between the safety valve and the drum or header, there shall be no outlet pipe and valve for taking steam.
(3) the lever type safety valve should be equipped with a device to prevent the hammer from moving automatically and a guide frame to limit the lever from derailing. The spring type safety valve should be equipped with a lifting handle and a device to prevent the adjustment screw from being turned casually.
(4) for boilers with rated steam pressure less than or equal to 3.82MPa, the throat diameter of safety valve shall not be less than 25mm; for boilers with rated steam pressure greater than 3.82MPa, the throat diameter of safety valve shall not be less than 20mm.
(5) the cross-sectional area of the connecting pipe between the safety valve and the boiler shall not be less than that of the inlet of the safety valve. If several safety valves are installed on a short pipe directly connected with the drum, the cross-sectional area of the short pipe shall not be less than 1.25 times of the exhaust area of all safety valves.
(6) generally, the safety valve shall be equipped with a steam exhaust pipe, which shall be directly connected to the safe place and have sufficient cross-sectional area to ensure smooth exhaust. The bottom of the vent pipe of the safety valve should be equipped with a drain pipe connected to a safe place. Valves are not allowed to be installed on the exhaust pipe and drain pipe.