MANUAL VALVE PRESSURE TEST
MANUAL VALVE PRESSURE TEST
(OP)
HI ALL
I HAVE A QUESTION REGARDING THE PRESSURE TEST OF MANUAL VALVE, OUR CLIENT REQUEST BY CONTRACT TO PRESSURE TEST THE MANUAL VALVE AT SITE, EVEN IF THE VENDOR ALREADY TESTED. I REMEMBER THAT IN ASME CODE IS WRITTEN THE IS NOT ALLOWED TO PRESSURE TEST THE MATERIAL MORE THE TWICE TO AVOID THE OVER-STRESS OF THE SAME. ANYONE REMEMBER ABOUT THIS OR KNOWS SOMETHING TO AVOID TO TEST THE VALVES ONE MORE TIME AT SITE?
THANK YOU
I HAVE A QUESTION REGARDING THE PRESSURE TEST OF MANUAL VALVE, OUR CLIENT REQUEST BY CONTRACT TO PRESSURE TEST THE MANUAL VALVE AT SITE, EVEN IF THE VENDOR ALREADY TESTED. I REMEMBER THAT IN ASME CODE IS WRITTEN THE IS NOT ALLOWED TO PRESSURE TEST THE MATERIAL MORE THE TWICE TO AVOID THE OVER-STRESS OF THE SAME. ANYONE REMEMBER ABOUT THIS OR KNOWS SOMETHING TO AVOID TO TEST THE VALVES ONE MORE TIME AT SITE?
THANK YOU





RE: MANUAL VALVE PRESSURE TEST
2. What country, what code, what service and what operating pressure?
3. What type of valve, what type of pressure test, and what is the purpose of the pressure test?
A "manual valve" requires operational (leak check) tests at the normal operating pressure, and hydrostatic pressure tests. Often, the system operational testing/startup testing also checks manual and automatic valves after installation for leaks at the flange/weld, and leaks across the seat. The manual valve does not (usually) require an operational (movement) test, unlike an automatic or remote-actuated valve. But most good operators manually cycle every valve as well - you never know what happened during construction and storage and layup.
RE: MANUAL VALVE PRESSURE TEST
"ASME" is an organization, not a code. They issue many hundreds of codes.
A test should not be at a level where is damages the equipment being tested or results in permanent strain / deformation.
There, in theory, the item can be tested as many times as you like.
For valves the issue is normally that the seals (in stem seals) are not rated for the test pressure and therefore, if tested a lot, you could damage some of those seals.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: MANUAL VALVE PRESSURE TEST
RE: MANUAL VALVE PRESSURE TEST
I can see why the client wants to test valves on site. I have seen factory test certs for seat tests and the valves turned up on site with no seats installed!
RE: MANUAL VALVE PRESSURE TEST