MSM,

The issue is not only with momentum criteria but also with low and high freqency vibration which is outside the area of expertise of process engineer and hence he has correctly passed it on to the stress engineer.The stress engineer from his /her side can of course pass the baton to noise specialist who mostly address the issue of high frequency vibration ( acoustic vibration mentioned and explained in my response. The type explaiend in Carucci's and Franci's paper). The low frequency vibration ( flow induced vibartion mentioned in my response)which involves turbulence and flow separation is the regime of the expertise of pipe stress engineer ( albeit this also requires computation of some acoustic modes , which , luckily being the planar modes can be generally computed w/o a detailed coupled acoustuc-structural analysis).Regarding high frequency vibration, instead of rhov^2 the process engineer should compute the sound power level which is a function of Mach No, Pressure drop, Molecular weight and Temperature .

Regards