Turboexpander Commissioning

1. Blow down piping & check installation of valving.

2. Gas source at design pressure and temperature / customer connections installed.

3. Differential pressure switch / transmitter installed correctly and set point checked.

4. Low pressure switch / transmitter installed correctly and set point checked.

5. Electrical connections correct and checked.

6. Seal gas filter assembly clean, filter element new.

7. Check that wing nut at bottom of filter is tight.

8. Supply regulator and backpressure regulator checked and set correctly.

9. Check Flow Meter for correct operation.

1. Charge accumulator to correct gas pressure shown on P&ID. (25 psig)

2. Verify that accumulator isolation valve is open and bleed valve is closed.

3. Check that correct lube oil is available and used per manual instructions.

4. Rotation check on single or dual pumps. (Motor bump test.)

5. Verify low lube oil pressure alarm set point and start of stand by pump.

6. Verify low lube oil pressure shut down set point.

7. Verify oil reservoir heater operation.

8. Check that lube oil reservoir demister has the correct elements and relief valve.

9. Check that mist eliminator drain line extends below the oil level near bottom of tank.

10. Check that reservoir fill cap is correct for application (vented or non-vented).

11. Check that mist eliminator is properly secured for outdoor application.

12. Check lube oil filter assembly and clean prior to start of oil flush.

13. Install flushing jumper around unit bearing case.

14. Check water supply to shell and tube oil cooler including water inlet temperature.

15. Reservoir filled to correct level. (Verify oil fill pump is clean prior to use.)

16. Verify reservoir level gauge functions properly and is not leaking.

17. Verify operation of reservoir liquid level switch.

18. Circulate oil for a minimum of 6 hours and check screen or elements for cleanliness.

19. Verify safety relief valve operation.

20. TI’s and PI’s on lube system functioning correctly.

21. Verify there are no oil leaks from piping, tubing, or components.

22. Verify correct oil pressure supply to the machine(s) & check flow meter for correct operation.

23. Accumulator run-down. Time in seconds.

24. Insure accumulator cap threads are coated with anti-seize or other rust inhibitor.

1. Expander Inlet line blown down and clean.

2. Suction screen correctly installed in expander inlet line (with sock installed when supplied).

3. Inspect casing drain for expander and compressor casing. Drain valves are required.

4. Verify fit of inlet pipe to expander inlet flange.

5. Verify smooth action of quick close valve. Time to close in seconds.

6. Verify fit of discharge line to expander discharge flange.

7. Inspect expander inlet and discharge pipe supports.

8. Compressor inlet line blown down and clean.

9. Verify fit of compressor inlet line to compressor inlet flange.

10. Suction screen correctly installed in compressor inlet line.

11. Verify fit of compressor discharge pipe to compressor discharge flange.

12. Inspect compressor inlet and discharge pipe supports.

13. All check valves installed in correct direction.

14. Compressor discharge check valve at correct location.

15. Verify recycle valve (anti-surge) operation. Time to open in seconds.

16. Verify location of bypass is downstream of aftercooler.

17. PI’s, TI’s, and transmitters calibrated.

18. Verify that quick closing inlet trip valve(s) fully close and seal for zero leakage.

19. Verify 5 Diameters of straight pipe at compressor inlet and expander discharge as shown on P&ID.

20. Trace all tubing lines to correct locations as shown on the P&ID.

21. When screen socks are installed, cut felt end excess so that four one inch wide tabs extend between the screen flange and the gasket.

1. Verify actuator stroke per machine assembly drawing and internal nozzle stops.

2. Verify limit switch operation (if applicable).

3. With inlet spool removed verify smooth rotation of rotor.

4. Verify shaft and bearing thrust float.

5. Verify compressor wheel to shroud axial and radial clearances.

6. Check Gap voltage for all vibration probes.

7. Set and verify speed probe distance from shaft.

8. Speed indicator reading(s) verified with signal generator input.

9. High speed alarm and trip set points verified.

10. Verify continuity on RTD leads.

11. Verify integrity of connector to cable. Repair if required.

12. Verify that RTD’s read out correctly at ambient temperature.

13. Shipping bolts in compressor casing feet loosened.

14. Verify all set points per P&ID.

15. Fill pressure gauges with glycerin or halocarbon oil.

16. Verify that all contractual spares are at site and properly stored.

17. Document with digital photographs.

18. Confirm that customer has machine do-not-dwell zones in DCS.

19. Verify that tachometer input settings agree with Electrical Schematic and P&ID.

20. Inspect Control Panel enclosure for weather and water tightness. Check window gasket.

21. Machine trip at full speed run-down time for rotor to stop (Determined by loss of vibration signal & speed):

22. Verify all electrical connections are checked and terminal screws are tight.

23. Check and verify the warm and cold expander location is correct on skid and correct cartridge installed.

24. Ensure cartridge lifting points and jacking holes are plugged with anti-seize applied.

25. Seal the centerline split in insulation panels and perimeter of cartridge insulator plate with silicon.