Permanent pressure loss for flow meters is expressed as a percentage of meter DP, which you aren't able to measure. You would be better off approximating your bent piece of pipe as a contraction followed by an enlargement. Use the equations found in Cameron Hydraulic data (in my 16th edition...
Herman2-
Sorry for the late post.
You may have found out by now that VFD's cannot be applied to centrifugal compressors. Some other comments:
Motors of this size range are good for only 1 or 2 hot starts per hour, so cycling compressors to maintain pressure and match equipment with load is...
