Testing a Vacuum Breather Valve

[Inchtain]

Dear colleagues,

We have a Vaccum Breather Valve whose setting is -10 mbar and installed at a fuel gas blanketed Water Backwash Clarifier (The design pressure of the Vessel is 20 mbar and the current vessel operating pressure is 5 mbar; while the diameter of the vessel is 3600 mm and the height is 7000 mm with a thickness of 14mm bottom head/10 mm shell and top head)

When testing the setting of this vaccum breather valve and after lapping the seat and replacing the diaphram, the valve fully opens at -9.3 mbar with no leaking when it is closed, so do you think that we can accept the test and install back the valve?

Thanks.

 

[Nasim12345]

Tank Breather valve set pressure tolerance is +-10%. As mentioned above, if the valve opens at -9.3, it is acceptable.