The preventive maintenance (PM) of Instrument Air Compressor in Oil & Gas Plants are listed below.
The control panel checkout procedure is designed to verify that a control panel is functioning properly. The checkout can be used for initial testing or in conjunction with routine maintenance schedules.
Refer to the control drawings and checkout procedure included with the Control Panel Instructions in this manual to ensure proper adjustments and calibrations.
Filters require periodic cleaning and replacement. A daily draining of the regulator coalescing filter will indicate the severity of any contamination problem.
Periodically stroke the inlet valve to aid in optimum performance of the compressor preferably every six months.
Observe for freedom of movement of the inlet valve during the stroking procedure.
Periodically stroke the bypass valve to aid in optimum performance of the compressor.
In addition to stroking, the bypass valve should be removed from the air piping system annually to inspect the seals for damage.
Replace damaged seals as required and reinstall the valve.
1. With 4mA supplied to the positioner. Rotate ZERO adjustment nut wheel until:
2. Increase to 20mA and adjust the SPAN adjustment on the positioner terminal board until.
3. Decrease source to 4mA and check the zero adjustment position of the valve.
4. Repeat zero and span procedure until valves are fully open and closed at their respective mA values.
Remove the regulator adjustment screw cap and back off on the adjustment screw until pressure indicated on the outlet pressure gauge is Zero.
Increase pressure to the operating pressure of 60 PSIG (414 kPa).
INLET valve: Cam should be on side B with the arrow of the 0-100% range pointing to the left as the cam is viewed.
BYPASS valve: Cam should be on side A with the arrow of the 0-100% range pointing to the right as the cam is viewed.
Note: The above points may change depends on compressor vendors and models.
Attach a 4-20 mA source (+ to + and – to -) to the positioner.
Adjust the source so that 4 Ma is being sent to the positioner and observe valve action.
INLET and BYPASS valve action: Should not have moved as a result of applying the 4 mA.
Adjust source to 20 mA. Note valve action.
INLET valve action: Should open 90-degree. The positioner indicator should show a 90-degree rotation.
BYPASS valve action: Should close 90-degree. The positioner indicator should show a 90-degree rotation.
If valve action occurs as noted, the valves are properly stroked and ready to receive control signals from the MP3 microcontroller.
Periodically monitor shaft vibration on both sides of the coupling with a vibration analyzer.
In normal operation do not run the unit when vibration levels, as measured on the shaft, exceed two (2) mils on three thousand to thirty-six hundred (3000-3600) RPM drivers and two and one half (2-1/2) mils on fifteen to eighteen hundred (1500-1800) RPM drivers.
If vibration is measured using a non-contacting probe, add one half (1/2) mil to the above levels. If vibration levels exceed the above values shut the unit down and determine the cause of vibration.
Note: The vibration parameter values or any other above mentioned values may change as per the vendor or model of the IA compressor. These are only for reference.
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The control panel checkout procedure is designed to verify that a control panel is functioning properly. The checkout can be used for initial testing or in conjunction with routine maintenance schedules.
Thanks for the post information.