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@davefitz @SPDL310 Good point on the expander. I've got a standard 8x16 concentric reducer. Dimensions OD D = 406.4, OD D1 = 219, L = 356 (mm).. I did a quick and dirty scale off a drawing and if I'm looking at the right angle, it is approx. 25 degrees. So the Jet noise phenomena may be...

@1503-44, @hacksaw We are using schd. 40 pipe. I would consider schd. 80 next time around. I never thought about the the support spacing, but it is pretty random... we don't have and long continuous runs, basically the pipe turns vertically up after the skid and then feeds a header...

@1503-44 Wow, 1000 psi, that's hefty. Were they globe valves? Re: Velocity - I just dug out another consultants spec that called out max. fluid velocity limits of 167 ft/s for 6" and smaller and 250 ft/s for 8" and larger for natural gas pipe and fittings. Holding to 80 fps for our piping in...

Thanks everyone taking the time for your detailed responses, Sorry I've taken so long to respond: The FCV (in the first sketch) is an 8" V260 V-Ball Flow control valve (Fisher) with factory integrated aerodome noise attenuator -...

We have installed a flow control skid, and have measured noise at the downstream piping in excess of 100 DbA. We will likely be designing a similar installation in the future, and am looking for some input on how to mitigate noise in a gas piping system. - See attached sketch. - The skid is...