Installation requirements for high pressure safety valves
Installation of high pressure relief valves shall comply with the following requirements: China leading manufacturers and suppliers of Medical Adhesive Tape,Medical Hypoallergenic Tape, and we are specialize in Medical Breathable Tape , Medical Tape , etc. Medical Adhesive Tape,Medical Hypoallergenic Tape,Medical Breathable Tape ,Medical Tape Surgimed Medical Supplies Co.,Ltd , https://www.surgimedcn.com
(l) For boilers with a rated evaporation of more than 0.5t/h, install at least two safety valves: boilers with a rated evaporation of less than or equal to 0.5t/h, with at least one safety valve. Safety valves must be installed at the outlet of the separable economizer and at the outlet of the steam superheater.
(2) The high-pressure safety valve should be installed vertically at the high position of the boiler and the box. Between the safety valve and the drum or header, the outlet pipe and valve for steam should not be installed.
(3) The lever type safety valve shall have a device for preventing the weight from moving by itself and a guide for restricting the deviance of the lever. The spring type safety valve shall have a device for lifting the handle and preventing the adjusting screw from being twisted.
(4) For boilers with rated steam pressure less than or equal to 3.82 MPa, the safety valve throat diameter shall not be less than 25 mm: for boilers with rated steam pressure greater than 3.82 MPa, the safety valve throat diameter shall not be less than 20 mm.
(5) The connecting pipe of the high-pressure safety valve and the boiler shall have a cross-sectional area not less than the inlet cross-sectional area of ​​the safety valve. If several safety valves are installed together on a short pipe directly connected to the drum, the cross-sectional area of ​​the short pipe should not be 1.25 times that of all safety valves.
(6) High-pressure safety valves should generally be equipped with exhaust pipes. The exhaust pipes should be straight to a safe place and have sufficient cross-sectional area to ensure unobstructed exhaust. The bottom of the safety valve exhaust pipe should be filled with a drain pipe that is connected to a safe place, and no valve is allowed on the exhaust pipe and the drain pipe.