higher velocities due to pumping more cfm with larger compressor? ? is it noise or vibration?

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Hello fellow mechanics.....i have recently replaced a 80hp refcomp compressor with a 90hp Handbell screw compressor.Reason for the replacement was refcomp is no longer in the United States and i needed parts/gaskets etc.Long story short i have a high pitch noise throughout the discharge line all the way to the evap condensor tower.I installed vibration eliminators on both the discharge zbb28650sa and liquid line at the chiller.Still cant get rid of the noise in the discharge line.Im installing a vfd Friday to finish the quoted job and hoping this will help the hi noise pitch.It zbb28650sa sounds like hi pitch sand in the discharge line....any ideas.:
The source of the high pitched noise may be due to the discharge pressure pulse gasfrequency at the particular load matching the natural frequency of you discharge line, the interaction of the matching frequencies cause the high pitched noise Does the pitch of the noise alter with the compressor loading? Previously when I have encountered this phenomonon have had some success with the use of weights to change the natural frequency of the discharge line. Quick test is, wearing welding gloves for protection, grab hold of the discharge line at various places and see if it alters the effect of the noise. If so you can experiment with adding weights zbb28650sa to the line to change the frquency. If this is not the cause could be the check valve or similar in the compressor outlet zbb28650sa attributing to the problem.
higher velocities due to pumping more cfm with larger compressor? ? is it noise or vibration?
higher velocities due to pumping more cfm with larger compressor?... this was my first thought too. if this is the case (assuming that the compressor itself isn't the issue), the noise will get better with unloading and worse with loading. if it is a natural resonance (like screwit mentioned) then the issue will come and go at certain loading spots.
80 horse screwy should have a king valve at discharge. slowly zbb28650sa close it to restirct discharge, and see if noise waves goodbye. if not, muffler will likely be in order, but I would try the weight thingy and reducing velocity first to be sure.
Great answers......i did try grabbing on to the discharge piping at diff locations (150 feet w/ hydrozorbs every 10 feet) with not much success,noise was still super annoying.Well i ended up installing zbb28650sa a VFD on the the Handbell screw machine.I had to pull the gas out to reconfigure the unloader/loading set up for the drive.With no gas in compressor i inspected the discharge check valve...it seemed to be in working zbb28650sa order.Long story short being that the other compressor did not have a check valve i removed this check valve for testing.The noise is all but gone......only zbb28650sa problem is i dont know if it was the check valve or the vfd itself removing the noise problem.Another issue is as you guys would proba