Valve Sound Power Spectrum

[MBarnett]

To estimate acoustic vibration of pipework downstream of PSV's, it has been advised that knowledge of the sound power spectrum is required - the frequency range of acoustic energy distributed into pipework downstream of the valve resulting from turbulence injected by the valve. I have requested that the valve suppliers provide this information - however they seem unfamiliar with the concept, and the implications. Can anyone advise how the sound power spectrum for a valve be assessed/derived/calculated?

 

[JFHPELVIEW]

What is the valve controlling. If a gas and in choke condition, peak octave will be 1 to 2 K generally with a 6 to 9 dB drop off/octave as frequency decreases, 3 dB/octave for 4k & 8K. Not sure that this is what you are looking for. For gas under choke condition, valve size, etc. is of minimal importance. At less than choke pressure ratio, it becomes a function of throat diameter, and other factors. For liquids, I cannot comment.

 

[MBarnett]

The valve in question is not in fact a control valve but a SRV on a Hydrocarbon Gas/Condensate Separator. Valve Manufacturer is unable to revert with details of sound power spectrum for SRV - is there anyway to verify - either directly or generically that doesn't involve physical testing/measurement?