Temporary gas flow metering

<compressors are not meeting performance, or the flow meters are not reading correctly (or perhaps the power measurement is not right).>

Check correct reading by meters

#1 compressors are not meeting performance, In Pressure,Out Pressure-Gauge

#2 power measurement KW/KVA metering recheck

#3 flow meters are not reading correctly

Correct Data interpreted from #1,#2 will reveal if #3 is showing incorrectly.

Yes, but if the flow meters are suspect, the pressure measurement and the power measurment might be considered suspect as well..

If you do a performance calc all are related. An error in pressure temperature flow or power will cause a problem with the calc. I would like to verify the flow to eliminate that as an issue.

You can try googling "Non-invassive ultrasonic flow meter". You will find a number of brand names for meters where ultrasonic transducers are strapped outside of the pipe. They may be permanent or temporary.

Notwithstanding, I would recommend that you check the variability of gas process temperature and pressure. Ultrasonic measurement is very sensitive to these two process variables. If P and T vary by more than 10%, you should consider an automatic P and T compensation of flow. You may want to google "Ultrasonic meter uncertainty analysis" for reference.

Finally, if P and T don´t vary so much, and if error is relatively constant in magnitude and direction, you may consider verifying all your calibration calculations and your ratio and power conssumption formulas. There may be an error in a constant, or in the value of the process P and T used for calibration and or other calcs. What they call a bias error.

Regards,