Ruhrpumpen VLT - Rotating Assembly Adjustment (Impeller Lift)

VLT
Vertical Process Pump
27 V1.090418
d. Use the driver alignment jack screws to reduce the total indicated run-out to or below
the following limits, according to the pump’s specific RPM:
 0.002 inch (0.05 mm) for pumps running at 3000/3600 RPM.
 0.004 inch (0.10 mm) for pumps running at 1500/1800 RPM or lower.
 0.006 inch (0.15 mm) for pumps running at 428/514 RPM or lower.
e. Place and tighten the bolts to secure the driver to the nozzle head.
f. Proceed with step 10.
8. Place the driver on the nozzle head.
9. Place and tighten the bolts to secure the driver on the nozzle head.
10. Check the driver to ensure it is properly lubricated. Consult the driver manufacturer’s
manual for specific instructions.
11. Reconnect all wires and piping in order to get the driver working.
12. Check driver shaft rotation (it must be counter-clockwise when viewed from the top of the
motor).
13. Start pump up.
4.4.3 Rotating Assembly Adjustment (Impeller Lift)
NOTE: This procedure must be disregarded for pumps fitted with internal thrust pots, models 311
and 7312.
1. Prior to commencing with the adjustment, make sure that the setting collar on the
mechanical seal is loose and unattached from the pump shaft. The pump’s half coupling
and the adjusting plate must be in place on the pump’s shaft. Be sure that the pump’s half
coupling key is installed. The spacer must be bolted to the driver’s half coupling. The
adjusting plate and the pump’s half coupling must not be bolted to the spacer. This allows
the pump’s impellers to rest on the bowl’s seat.
2. If you are unable to turn the adjusting plate by hand, remove it and check the threads for
damage.
3. While holding the pump’s coupling, rotate the adjusting plate until the gap between the
faces of the adjusting plate and the spacer is equal to the impeller’s lift shown in the
pump’s nameplate (the nameplate is mounted on the nozzle head). Use a feeler gauge,
hex key or any other suitable tool to measure the appropriate thickness.
4. Turn the adjusting plate until the bolt holes align with the nearest bolt holes of the pump’s
half coupling.
5. Rotate the driver shaft so that the bolt holes of the spacer are aligned with the bolt holes
in the adjusting plate and the pump’s half coupling.