Low Press Steam Relief Valve Manifold Sizing
Low Press Steam Relief Valve Manifold Sizing
(OP)
I have four (4) 15 psig boilers, each rated at 4,000 MBH input. How do I size a manifold for the relief lines? They wish to header them together and exit through the roof.





RE: Low Press Steam Relief Valve Manifold Sizing
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Personally, I don't like the idea of connecting several pressure safety / relieve valves to one header.
You should consider the possibility that some or even all the valves are opened simultaneously. The set pressure of each valve may not be the same of the others, thus, backpressure caused by the highest one may interrupt the discharge of the rest with lower set pressure.
RE: Low Press Steam Relief Valve Manifold Sizing
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RE: Low Press Steam Relief Valve Manifold Sizing
There is also the question of maintence. The manifold option would require all boilers to be closed down to service one relief valve. (Same goes for the good idea of saving money by not having individual boiler isolation valves which came to grief on a refinery I know). I would guess the maintenance argument would kill off the manifold option.
RE: Low Press Steam Relief Valve Manifold Sizing