Requirements for safety valve inlet and outlet pipes

Time：2021/9/15 23:35:06 Category：TECHNICAL ARTICLE Source： Click：

What are the requirements for safety valve inlet and outlet pipelines?

(1) The cross-sectional area of ​​the connecting pipe and the through hole of the pipe fitting between the safety valve and the boiler or pressure vessel shall not be less than the inlet cross-sectional area of ​​the safety valve; if several safety valves share the same inlet pipe, the flow cross-sectional area of ​​the inlet pipe Not less than the sum of the inlet cross-sectional area of ​​the safety valve.

(2) The safety valve and the steam drum and header of the boiler are generally not allowed to be installed with a shut-off valve, or to take the steam out of the pipe. It is generally inappropriate to install a stop valve or other outlet pipe between the safety valve and the pressure vessel; for pressure vessels containing extremely high, high, or moderately hazardous, flammable, corrosive, viscous or precious media, the use of The technical person in charge of the unit in charge of the pressure vessel approves and formulates reliable preventive measures before installing a shut-off valve between the safety valve and the pressure vessel. During the normal operation of the pressure vessel, the shut-off valve must be kept fully open, sealed or locked. The structure and diameter of the stop valve shall not hinder the safe discharge of the safety valve.

(3) The spring-loaded safety valve with threaded connection should be connected with a short pipe with thread, and the short pipe should be connected with the simplified and header by welding.

(4) The safety valve must be equipped with a discharge pipe. The discharge pipe should try to avoid twists and turns to minimize resistance. The discharge pipe should lead directly to a safe place and have sufficient circulation cross-sectional area to ensure smooth exhaust.

Knowledge contributor: Shanghai Wuyue Safety Valve