Can anyone tell me the leak rate allowed during hydrotest for an emergency shutdown valve (16") in hydrocarbon (Methane) Gas Riser/Pipeline Service
Well figured, you must be good, I did have the HP separator wrong - it is 450psi - the LP was correct at 160.
Of interest, would you allow a check valve upstream of any PSV or would you insist on a block valve. I know a block is obviously better, but check valves have been fitted and will be...
Thanks for all your help, to answer some of the questions above
The separation is oil & gas, HP only 600psi, LP 160psi (operating). Gas goes eventually to compression via heat exchangers, oil goes to oil treater vessel. There is a blowdown line to flare on the separators. The system is HP/LP...
If I have two vessels (Hp & LP Separator) separated by a an Emergency Shutdown Valve and a Flow Control Valve, do I need to size the PSV on the downsteam vessel of the two (LP Separator)to accommodate a gas blowby from BOTH vessels
what is the view on using a single block valve with a DPE (double piston effect) instead of using conventional DB&B valve arrangements. How does the double piston effect work. does it provide 3 genuine levels of safety similar to conventional DB&B valves [/b]
