Annual Function Check and Calibration of COMPRESSOR GAS IP/HP PROCESS & associated Equipments Instruments

TASKS TO BE PERFORMED:

1. Annual Function Test and Calibration of MAGNETROL LEVEL SWITCH LOW ALARM.
2. Inspect Level Switch for any physical damage.
3. Ensure Level Switch is securely mounted.
4. Inspect electrical signal cable for any physical damage.
5. Check cable gland and terminal box cover are secure.
6. Remove Level switch cover and inspect switch mechanism
MERCURY SWITCHES
7. Visually inspect Switches for any short circuit damage.
8. Check for small cracks in the glass tube containing the mercury.
9. Check all terminations are secure.

NOTE: These cracks will allow the entrance of air into the tube causing the mercury to oxidise and appear dirty.
If this condition is found replace switch immediately.
DRY CONTACT SWITCHES
10. Visually inspect switches for excessive wear on actuating lever.
11. Visually inspect switches for misalignment of adjusting screw at point of contact between screw and lever.
12. Adjust mechanism to compensate for this condition.
If this cannot be corrected replace switch immediately.
13. Isolate Level Switch Low from the process by closing the bridle manual isolation valves.
14. Drain the process fluid from the float chamber to a pre-determined level where the the Low Alarm should have activated. Tee in clear plastic pipe and strap to chamber in order to view level indication.
15. Close the float drain valve.
16. Check that the Switch has activated. Adjust as required.
17. Check that the Low Alarm has been received in control Room.
18. If adjustment are made in step 16, using a hand pump, refill the float switch chamber with process fluid or liquid of an equivalent S.G. and repeat steps 14 through 17 till the correct setting is obtained.
19. Complete Instrument Calibration Sheet.
20. Ensure all drain points are securely closed off.
21. Check all disturbed connections for leaks using soap solution.
22. De-isolate the Level Switch and put back on line equalising the level in the float chamber with the vessel.
23. Re-instate all bridle valves.
24. Checks that the Alarm annunciation has been accepted reset.
25. Replace switch cover ensuring 'O' ring seal is in good condition.
26. ENSURE ANY OVERRIDE IS REMOVED AND AUGUST SYSTEM RETURNED TO NORMAL MODE.
27. Sign-off Work Permit and return to operations.
28. Report all findings to supervision and document in CMMS

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