Regarding the airtightness test of pipelines, the location of valves on the pipeline
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When conducting a gas-tightness test on a pipe, what should be the position of the valves on that pipe? For example, should ball valves be fully open? Should control valves also be fully open?
This post was last edited by ylb913 on 2016-9-22 at 12:44. Valves should be opened in systems with the same design pressure; systems with different design pressures must be isolated from each other (valves closed), unless the entire system is made airtight at the lower design pressure, in which case it can be pressurized together at that lower pressure first before isolation, allowing the high-pressure system to continue to be pressurized independently.
The valves within the airtight system should be opened.
Open fully and check whether the valve is leaking
The valve is tested for airtightness separately before installation
Should a system be isolated from another system using a blind flange or a valve? If blind plugging is used for isolation, should the valve in front of the blind plug be closed or open?
For airtightness testing, all valves should be opened, as airtightness testing is not a pressure test; all connected pipelines can be tested together for airtightness, and valves must definitely be opened. . .