check valve on Rupture disk outlet
check valve on Rupture disk outlet
(OP)
There is a need of providing the flow switch at outlet of Rupture disk installation for liquid relief application to tank. 65 psig back pressure is created because of flow of liquid in another pipe where the RD will be discharging, which is 2000 ft long line going to tank.
Instrument asked me to provide a check valve at outlet so that when there is flow in otherline where RD outlet is connected the flow switch does not sense the flow.
My question is "can I provide a check valve at Rupture disk outlet?"
Instrument asked me to provide a check valve at outlet so that when there is flow in otherline where RD outlet is connected the flow switch does not sense the flow.
My question is "can I provide a check valve at Rupture disk outlet?"





RE: check valve on Rupture disk outlet
With all that, a check valve will add a psi or so of extra backpressure as long as it doesn't scale up and seal itself closed. I wouldn't put a check valve in a safety device discharge, but then I also wouldn't dump it into a process line or run it 2,000 ft.
Flare headers are used all the time and are occasionally longer than your 2,000 ft, but I've never heard of comingling safety-device exhaust with a normal process, but maybe that is just that I've never heard of it.
David
RE: check valve on Rupture disk outlet
Any restriction in a pressure relief path should not be installed.
Orifice plates, in-line flow meters (switches), check valves are at the top of my list of restrictions.
You can detect rupture disk activation by other means.
RE: check valve on Rupture disk outlet
Good luck,
Latexman
RE: check valve on Rupture disk outlet
Good luck,
Latexman
RE: check valve on Rupture disk outlet
Regards
StoneCold
RE: check valve on Rupture disk outlet
Burst disk indicator (proposed by Latexman) and buckling pin system with positional switch (proposed by StoneCold) are good idea in detecting RD opening. Besides, provision of double RD with pressure transmitter is another way.
If you select flow switch as mean to detect opening of RD, make sure it does not form a device potential causing partial blockage of relief flow path.
JoeWong
Chemical & Process Technology