Another Update:
It turns out that the performance runs I was looking at were old. The compressor was re-geared to speed it up and get more flow. The rotor is now turning at 3422 RPM which translates to a lobe pass frequency of 228 Hz.
All the readings were indicating multiples of 228 Hz. I am...
Update:
So upon further investigation it turns out that there is internal gearing in the compressor and that the male rotor is supposed to be turning at ~2887 RPM (48.1 Hz) which would make the lobe mesh frequency ~192.5 Hz. Still pretty far from 910 Hz.
Ron, it is a dry gas compressor and...
Thanks for quick reply.
I don't know exactly how many teeth are on the reduction gear but its very near a 1:1 gear ratio.
My feeling is that it isn't unbalanced forces or another sort of mechanical excitation simply because the energy required to vibrate 20" pipe 20 ft off skid would be...
First let me say that I am new to screw compressors so some of my questions may be pretty basic.
Background:
A large screw compressor (~1200 HP) is processing natural gas. The machine has four male lobes and six female lobes. It is geared down from 1200 RPM to ~1164 RPM. It discharges into NPS...
