Performed passing test on MOV's on low pressure, we found valves passing, I would like to know if the high pressure above 60barg will seal the seat leakage.Some types of ball valves have a 'floating' ball, where the upstream pressure assists the seating tightness so you will get a tighter seat on higher pressures.  Others have a fixed ball but with springs in the seat itself.   So it does depend on the type of valve you have. the maintenance boundaries are usually whatever your maintenance shops work out.  Some shops, especially if heavily unionized, may require having both an I&C and a mechanical (and, maybe even an electrical) maintenance person to work the same job.  Where one discipline stops and the other begins is often defined in a Union contract.  I wouldn't recommend even thinking about trying to change those (it's an exercise in frustration; beating your head against a brick wall will give you better results.)  The best you can hope for is getting all the involved craft people to the job at the right time without losing too much time and without anyone sitting around waiting for their part to start.

MORE NEWS