SERIES 8500-2400 PX BOOSTER PUMPS
Energy Recovery, Inc.
21
ERI Document Number 80020-01-2
18. Tighten the four (4) bolts between the inlet housing and the bell housing. Torque bolts to
12 ft-lbs (16 N-m) as shown in Figure 7-25. If the bolts between the pump and the bell
housing were tightened before the shaft coupling was tightened, loosen all four (4) bolts 2
revolutions. Then torque the four (4) bolts between the inlet housing and the bell housing to
12 ft-lbs (16 N-m) as shown in Figure 7-25.
19. Check to see that the shaft can turn relatively free by hand. The purpose for the ideal
impeller gap spacing is to keep the impellers free inside the bowls. The bowls are held in
place by the compression applied by the outlet nozzle while the splined shaft spins the
impellers. If the gap spacing is incorrect and the impellers rub/ interfere with the bowls,
premature failure of the pump may occur. A small amount of rubbing during an initial
break in period is acceptable.
20. After the pump is reassembled and reinstalled, make sure that water is fully flowing
through the unit before starting. THE PUMP CANNOT BE RUN DRY FOR EVEN A
FEW SECONDS. Damage will occur in seconds if the pump runs with insufficient feed
flow.
7.4 Disassembly of Wet End
The following procedure should be used when rebuilding the wet end of PX Booster Pumps.
1. Verify that the system is de-energized and un-pressurized.
The coupling screws must be tightened evenly according to the
torque requirements. The gap between the two halves of the
coupling must be equal on both sides. Failure to tighten the
coupling evenly and fully could cause an out of balance
condition resulting in excessive vibration and premature motor
bearing failure.
CAUTION
Tighten coupling before tightening the bolts between the inlet
housing and the bell housing.
CAUTION
Figure 7-25 – Final Step: Tighten Inlet to Bell Housing
