Natural Gas Relief Valve Detection
Natural Gas Relief Valve Detection
(OP)
Hello,
I have an application where we are removing the sulfur from natural gas via carbon beds at less than 15psig. We have relief valves on the tank, and if they were to pop off, we would obviously want to automatically shut off the supply.
Is there some type of sensor that could be placed on the vent stack from the relief valve that would detect the presence of natural gas (potentially with little to no sulfur!) that we could use to communicate with the main supply valves?
I've explored the use of a standard flowmeter, but my concern is that it may get false readings, or be hard to maintain it's accuracy. Also, I'm afraid it may not function properly during a short pop off burst of the relief valve.
Additionally, this will be at an unmanned site, so reliability of the equipment is a must.
Any direction or suggestions would be welcomed.
Thanks,
David
I have an application where we are removing the sulfur from natural gas via carbon beds at less than 15psig. We have relief valves on the tank, and if they were to pop off, we would obviously want to automatically shut off the supply.
Is there some type of sensor that could be placed on the vent stack from the relief valve that would detect the presence of natural gas (potentially with little to no sulfur!) that we could use to communicate with the main supply valves?
I've explored the use of a standard flowmeter, but my concern is that it may get false readings, or be hard to maintain it's accuracy. Also, I'm afraid it may not function properly during a short pop off burst of the relief valve.
Additionally, this will be at an unmanned site, so reliability of the equipment is a must.
Any direction or suggestions would be welcomed.
Thanks,
David





RE: Natural Gas Relief Valve Detection
Some PSV manufacturers offer a 'lift' indication.
http://www.leser.pl/pdf/czujnik_ruchu.pdf
I'm sure I remember one of the PSV vendors talking about it, Farris, AGCO?
RE: Natural Gas Relief Valve Detection
If you still need detection - how about a rupture disk under the PSV with a BDI?
Good luck,
Latexman
RE: Natural Gas Relief Valve Detection
Best to you,
Goober Dave
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RE: Natural Gas Relief Valve Detection
RE: Natural Gas Relief Valve Detection
US EPA is currently getting industry comments on new regulations that would require the owner to detect releases from PSVs in defined services. If this becomes law, these lift detectors will become common.
RE: Natural Gas Relief Valve Detection
IF not then: Consider a bursting disc upstream your PSV. Pressurize the void space between the disc and the PSV (e.g. with N2) and then have a PALL at the SP of your PSV? Its a bit heavy on instrumentation but its a viable way? If your gas is sour you may also save someting on the PSV since now you can make it "non NACE".
Best regards
Morten
RE: Natural Gas Relief Valve Detection
RE: Natural Gas Relief Valve Detection
Best to you,
Goober Dave
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RE: Natural Gas Relief Valve Detection