How to Troubleshoot a High Inlet Fault on an Ingersoll Rand Natural Gas Compressor
To diagnose why you are getting a high inlet after shutdown you need to watch what happens when the compressor shuts down paying attention to the gauges on the compressor gauge panel.
You should see the 1st, 2nd, 3rd and 4th stages go almost to zero when the compressor shuts down by the time it stops rotating. Also watch the Inlet Pressure Gauge – what does read as the compressor shuts down and then again right after the compressor stops rotating?
Things to watch for:
Are all stages unloading?
How quickly does inlet pressure rise after the compressor is shutdown and how high does the inlet pressure go?
Compare the inlet pressure to the pressure gauge on the outlet of the recapture tank regulator – how do they compare when inlet pressure is high?
If the compressor unloads properly and the inlet pressure is not high after it is unloaded but builds up after shutdown pressure could be leaking back from the recapture tank – that check valve is at the Dragon Valve.
Pressure could leak back from your system but that is unlikely – there is a check valve on the discharge of the gold colored priority (back pressure valve).
If you suspect that pressure is coming from the recapture tank you could vent all pressure off of the recapture tank and then observe what happens.
After you had the chance to watch the compressor shut down normally give me a call and we can discuss. Run only one compressor during troubleshooting.