Pulsafeeder PulsaPro 900 EN - Manual (Page 27)

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Diaphragm Replacement procedure
1. Disconnect the power source to the drive motor (e.g., lockout/tagout the motor disconnect).
2. Relieve all pressure from the piping system.
3. Close the suction and discharge shutoff valves (refer to Figure 8A).
4. Disconnect piping to the reagent head and drain any process liquid, following material safety
precautions from the process liquid manufacturer.
5. Place a pan underneath the pump head to catch any oil leakage from the pump.
6. If the oil is known to be contaminated by process fluid (e.g., the diaphragm has ruptured, the oil
is discolored, etc.) drain the oil by opening the oil drain valve below the base at the back of the
pump.
7. Remove the suction and discharge check valves as described in Section 7.3.1. Pour out any
liquids retained by the check valves into a suitable container, continuing to follow safety
precautions as appropriate.
8. Attach lifting means (e.g., straps, rigging and hoist) to support the reagent head during removal.
9. Remove the 10 nuts that secure the reagent head to the pump head.
O IL MAY LEAK OUT BETWEEN THE PUMP HEAD AND REAGENT HEAD AS THE REAGENT
HEAD BOLTS ARE LOOSENED .
10. Carefully slide the regent head straight off towards the end of the studs, please use caution not
to damage the threads.
11. Rinse or clean the reagent head with an appropriate material/method.
12. Remove and inspect the diaphragm. It may have taken a permanent convex or concave set as a
result of normal flexure and conformance to the dish plate. This condition is normal and is not
cause for replacement.
The diaphragm must be replaced if it is excessively deformed, dimpled, or obviously
damaged.
13. Ensure that the critical sealing areas of the diaphragm, reagent head, and pump head are clean
and free of debris.
14. When reinstalling a used diaphragm it is important to maintain the previous orientation relative
to the reagent head and pump head hole pattern.
15. Place the diaphragm into the circular groove in the reagent head press firmly around the outer
edge. The groove will hold the diaphragm in place until you install the reagent head to the
pump head.
16. Carefully move the reagent head into place over the studs.
17. Install the reagent head hold-down nuts finger tight (just in contact with the reagent head front
face).
18. Torque the nuts in an alternating pattern as defined in Appendix III. Initially torque the nuts to
one half the recommended value. Repeat the pattern, tightening the nuts to the specified value.
19. Re-install the suction and discharge check valves.
20. Re-install the suction and discharge piping.
21. Re-prime the pump following the procedure outlined in the next section.