Silencer for Steam Safety Relief Valve

A silencer after a relief valve will introduce downstream pressure, which in turn may raise the upstream pressure to unsafe levels--unless the relief valve is a type that is mostly unresponsive to changes in downstream pressure. I urge careful investigation.

(Is "floe rate" measured in icebergs per hour?)

i would say practically you have to follow the design of the silencer to the expected flow and that is the 100% capacity.

however, do you expect that it will simultaneously open in case of upset/over pressure in the system, reason why they 50% capacity each? i doubt if it will, relief valves though carefully set and commissioned may not open simultaneous, there might be a difference of 1, 2 or more seconds and when this happens, pressure will eventually decrease and the other one need noot to open.

A compact and very cheap way to ensure that the safety releif valves do not cause noise levels to exceed 85 dba at 3 meters would be to securely attach blind flanges to the discharge ports of the safety valves. If the noise limit is exceeded it will be brief and for reasons other than the safety valves.

If the customer wants the job done fast, cheap and right, tell him he must pick only two.

That is so wrong

One hopes no CR4 reader is within earshot when it happens. It is so distressing when an ear is shot off....

i agree...hehehe..

A silencer at down stream of a relief valve will introduce back pressure, which in turn will raise the upstream pressure to unsafe levels.Once silencer is considered, you should consider to change relief valves also to type suitable for Back pressure.

There seems to be an echo in the room. This sounds remarkably like an earlier post.

ASME Code does not allow any piping or fittings (or anything else for that matter) to restrict the safety valve flow. I believe Canadian and European codes are similar. I would think any type of silencer attached to a SV would need to be certified (just like a SV must be cert'd) before it could be installed. I suspect the Jurisdiction having Authority would also likely weigh in as well.

Rather then attach something to the SV or piping, I would consider some kind of sound attenuating apparatus (that does not restrict flow of course) that could be fitted around the release point. Alternatively, the relief flow could be piped to a location where dB's are not critical issue.

"Alternatively, the relief flow could be piped to a location where dB's are not critical issue."

Suggestion

How much back pressure does a calliope produce? Does it produce better noise?

1 calliope ≈ 0.268974521256 Muses Urania - which may produce, via Apollo (or maybe Oeagrus), one each, Orpheus and Linus - ^{_{not to be confused with Linus - as we are not talking Peanuts here}} - rendering the 'better noise' question mute.