API 598, Closure(seat) test by using lubricants
API 598, Closure(seat) test by using lubricants
(OP)
I have some problem with new on-off butterfly valve which provide zero leake(API598) by metal to metal sealing but this mention valve fail acceptance test in my workshop hence I contact valve's supervisor to solve this issue. He disassembly the valve and check all things such as alinement, clearance and others.
For closure test (Seat leakage test) he apply Molykote D 321 R to coat sealing surface therefore this valve able to perform zero leak.
According to API598 "Valve inspection and testing" mention that the sealing surface shall clean and fee from oil, grease and sealant.If necessary to prevent galling, the sealing surfaces may be coated with a film or oil that not heavier than kerosene"
Using Molykote with sealing surface is comply with API598 or not?
For closure test (Seat leakage test) he apply Molykote D 321 R to coat sealing surface therefore this valve able to perform zero leak.
According to API598 "Valve inspection and testing" mention that the sealing surface shall clean and fee from oil, grease and sealant.If necessary to prevent galling, the sealing surfaces may be coated with a film or oil that not heavier than kerosene"
Using Molykote with sealing surface is comply with API598 or not?





RE: API 598, Closure(seat) test by using lubricants
RE: API 598, Closure(seat) test by using lubricants
It would eb better to post this on the API Forum. You may gett more responses as this is the ANSI forum.
RE: API 598, Closure(seat) test by using lubricants
Applying a compound during testing is cheating.
Does the valve hold a type test seat leakage certification. Is is witnessed by 3rd party?