Pulsafeeder PulsaPro 900 EN - Manual (Page 52)

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9.3.1 Leak Detection Diaphragm Removal

Use the following procedure to remove the Leak Detection Diaphragm:
1. Disconnect the power source to the drive motor (e.g., lockout/tagout the motor disconnect).
2. Relieve all pressure from the piping system, and close the inlet and outlet shutoff valves
3. Take all precautions to prevent environmental and personnel exposure to hazardous materials.
4. Place a suitable container underneath the pump head to catch any liquid leakage.
5. Disconnect process piping and drain any process liquid, following material safety precautions.
6. Remove all but one top reagent head bolt. Oil will leak out between the pump head and reagent
head as the bolts are loosened.
7. Tilt the head and pour out any liquids retained by the check valves into a suitable container,
continuing to follow safety precautions as appropriate.
8. Remove the alarm switch assembly or pressure gauge from the pump head or reagent head
(depending on installation location).
9. Remove the bleed valve assembly and flat gasket from the pump head or reagent head
(depending on installation location).
10. Rinse or clean the reagent head with an appropriate material.
11. Remove the diaphragm by running a blunt blade along the periphery and prying it out.
9.3.2 Inspection
Remove and inspect the diaphragm assembly. It may have taken a permanent
convex/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
deformed, dimpled, or obviously damaged.
If the diaphragms have been removed from the spacer ring, the entire assembly should be
replaced to ensure proper sealing of its components.
9.3.3 Leak Detection Diaphragm Reinstallation
12. Ensure that the critical sealing areas of diaphragm assembly, reagent head, and pump head are
clean and free from debris. Align the diaphragm with the holding pins in the mating seal
groove in the pump head and position it into place. Ensure seating of the diaphragm sealing
ring into the holding pins is aligned properly.
13. Slide the reagent head into position using the studs and pins as an alignment guide. Tighten in
an alternating pattern to ensure an even seating force. Torque to the values recommended in
Appendix III.
14. Open the needle valve
15. Connect a hand-held vacuum pump or other vacuum source to the vacuum port, which fits 6
mm (1/4 in.) I.D. tubing.
16. Follow the same see section 12.4, “Pressure System Set-up and Priming”
17. If required, test pressure system operation.
18. After diaphragm set-up and priming, the pump is ready to be returned to service.