Bubble tight test
Bubble tight test
(OP)
Gentlemen:
Could some one explain what is meant by a bubble tight valve? How is the test done for bubble tightness?
many thanks
bob
Could some one explain what is meant by a bubble tight valve? How is the test done for bubble tightness?
many thanks
bob





RE: Bubble tight test
We'd essentially do a hydrotest on the upstream valve and check for leakage past the seat.
If you want to use compressed gas, you can put a flange with a connection going into a water filled tube so you can check for bubbles showing leakage is occuring (I'm not crazy about using compressed gas for high pressures).
RE: Bubble tight test
RE: Bubble tight test
The Butterfly valve is mounted on a test flange or spool piece where the hydrostatic pressure is built up to the test pressure at closed position.The other end of the valve is thoroughly cleaned with compressed air so that the disc and the seal is free from dust and watery compounds;This is done because you have to visually see the contact area properly.Now,The contact area of the disc and seal should not have any leakage or drop in pressure which can be verified by a pressure gauge(Even a delayed sweating is not permitted).This test is done for the time based on the standard you apply for the test procedure.
I would be glad to know from the members the procedure applied if the media is other than water and for valves other than Butterfly valves.
RE: Bubble tight test
RE: Bubble tight test
RE: Bubble tight test
RE: Bubble tight test
What application is your valve? It seems bubble tight has different meanings depending on the industry your in.
RE: Bubble tight test
RE: Bubble tight test
But in the field even though the valve passed the test, it may pass more than one bubble per minute, since the actual operating conditions may be different than the test conditions.
RE: Bubble tight test
A bubble-tight valve is tested by putting the valve in the closed position and applying the rated differential pressure, using water typically.
RE: Bubble tight test