Piping Leakage Testing
Piping Leakage Testing
(OP)
I need to know why it is not recommended to isolate the section of piping that we want to test using isolation valves (butterfly or gate valves) , always they used blind flanges for clsing both ends , is it beacuse we may have leakage from the valves or the pressure may damage the valve ????





RE: Piping Leakage Testing
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
RE: Piping Leakage Testing
Leakage ACROSS (ie. through) a closed valve is NEVER considered as a failure condition for a hydrotest.
Accordingly, you can decide either to trust the manufacturer's test of a flanged valve, or test it in the open (or part open) condition with blinds/blanks on the discharge of the valves, such that valve body seals and packings are part of the test.
Fundamentally this is the owner's call.