Annual Function Check and Calibration of Pressure Low Low Switches (SWITCH PRESSURE DIFFERENTIAL LOW) PDSLL


TASKS TO BE PERFORMED:

1. Annual Function Check and Calibration of Pressure Low Low Switches.
2. Inspect Switch for any physical damage.
3. Ensure Switch is securely mounted.
4. Check impulse line is securely fastened.
5. Check drain valve are closed.
6. Inspect impulse line connections for leaks.
7. Ensure drain valves are plugged and there are no leaks.
8. Inspect electrical signal cable for any physical damage.
9. Check cable gland is secure.
Pressure Switches, to be calibrated against hand held Digital Druck Comparator or Pressure Pump.
Use an Accurate Test gauge with a range suitable for the device being tested.
10. Isolate Switch from process and de-pressurise.
11. Check that the Low Low Pressure Alarm has been received in control Room.
12. Connect pressure source and apply pressure to the switch to above the required set point and ensure alarm has reset in control room.
13. Slowly decrease pressure to the required set point.
14. Check that the Switch has activated. Adjust as required.
15. Check that the Low Low Pressure Alarm has been received in control Room.
16. Increase pressure slowly till alarm resets and in order to check the hysteresis on the switch.
17. Repeat step 10 to 15 till correct set point has been obtained.
18. Complete Instrument Calibration Sheet.
19. Ensure all drain point is securely closed off.
20. Check all disturbed connections for leaks using soap solution.
21. Complete Instrument Calibration Sheet.
22. Affix calibrated switch with label giving date of calibration and tag number.
23. De-isolate sensing line and close by-pass valve.
24. Return Pressure switch to service.
25. ENSURE ANY OVERRIDE IS REMOVED AND AUGUST SYSTEM RETURNED TO NORMAL MODE.
26. Sign-off Work Permit and return to operations.
27. Report all findings to supervision and document in CMMS.






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