Do all main pipes need to be equipped with exhaust valves?
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For example, do exhaust valves need to be installed on the methanol, nitrogen, steam, and circulating water main pipes?
Normally: venting at high points and releasing air, while draining condensate at low points to prevent freezing.
A vent valve is used to prevent the formation of air pockets; if air pockets cannot form, then a vent valve is not necessary. Vent at high points and release air, drain condensate at low points to prevent freezing. It is the overall principle.
Generally, during the pressure testing phase, it is necessary to vent at the higher points and drain condensate at the lower points, and this is all temporary. Generally, a drain valve is installed at the lowest point and an exhaust valve at the highest point; however, the conditions of the medium also need to be taken into consideration, and the valves should be installed according to the actual situation
I know that exhaust at the high point and liquid discharge at the low point – maybe we should discuss it based on the specific circumstances
In which specification is it specified? Everyone is aware of this principle.