Suction Piping; Discharge Piping; Rotation; Operation - Xylem GOULDS HSC Manuel D'utilisation

2.7. Foundation must be flat and substantial to eliminate
strain when tightening bolts. Use rubber mounts to
minimize noise and vibration.
2.8. Tighten casing hold-down bolts before connecting
piping to pump.
2.9. No field alignment of pump to motor is necessary as
pumps are close-coupled.

3. SUCTION PIPING

3.1. Low static suction lift and short, direct suction piping
is desired. Consult pump performance curve for
Net Positive Suction Head Required (NPSHR), espe-
cially for lifts above 15'.
3.2. Suction pipe must be at least as large as the suction
connection of the pump. Smaller size will degrade
performance.
3.3. If larger pipe is required, an eccentric pipe reducer
(with straight side up) must be installed at the pump.
3.4. Installation with pump below source of supply:
3.4.1. Install full flow isolation valve in piping for
inspection and maintenance.
DO NOT USE SUCTION ISOLATION
CAUTION
VALVE TO THROTTLE PUMP .
3.5. Installation with pump above source of supply:
3.5.1. Avoid air pockets. No part of piping should be
higher than pump suction connection. Slope
piping upward from liquid source.
3.5.2. All joints must be airtight.
3.5.3. Foot valve to be used only if necessary for
priming, or to hold prime on intermittent
service.
3.5.4. Suction strainer open area must be at least
triple the pipe area.
3.6. Size of inlet from liquid source, and minimum
submergence over inlet, must be sufficient to prevent
air entering pump through vortexing. See Figures 1
through 4.
3.7. Use 3 to 4 wraps of Teflon tape to seal threaded con-
nections.

4. DISCHARGE PIPING

4.1. Arrangement must include a check valve located
between a gate valve and the pump. The gate valve
is for regulation of capacity, or for inspection of the
pump or check valve.
4.2. If an increaser is required, place between check valve
and pump.
4.3. Use 3 to 4 wraps of Teflon tape to seal threaded con-
nections.

5. ROTATION

5.1. Correct rotation is right-hand (clockwise when
viewed from the motor end). Switch power on and
off quickly. Observe shaft rotation.
4
5.1.1. Single-phase motor: Non-reversible
5.1.2. Three-phase motor: Not offered.

6. OPERATION

6.1. Before starting, pump must be primed (free of air
and suction pipe full of liquid) and discharge valve
partially open. Plugs are provided in the casing and
valve so pump/suction piping can be filled and/or
vented/drained in any pump orientation.
6.2. Make complete check after unit is run under operat-
ing conditions and temperature has stabilized. Check
for expansion of piping.

7. MAINTENANCE

7.1. Ball bearings are located in and are part of the mo-
tor. They are permanently lubricated. No greasing
required.
PUMPED LIQUID PROVIDES LUBRICA-
CAUTION
TION. IF PUMP IS RUN DRY, ROTAT-
ING PARTS WILL SEIZE AND MECHANICAL SEAL
WILL BE DAMAGED. DO NOT OPERATE AT OR
NEAR ZERO FLOW . ENERGY IMPARTED TO THE
LIQUID IS CONVERTED INTO HEAT. LIQUID MAY
FLASH TO VAPOR. ROTATING PARTS REQUIRE
LIQUID TO PREVENT SCORING OR SEIZING.

8. DISASSEMBLY

Complete disassembly of the unit will be described. Pro-
ceed only as far as required to perform the maintenance
work required.
8.1. Turn off power.
8.2. Drain system and flush if necessary.
8.3. Disassembly of Liquid-End:
8.3.1. Remove casing bolts.
8.3.2. Remove motor and remaining Liquid-End as-
sembly from casing (still connected to piping)
and position vertically for easier disassembly.
8.3.3. Remove impeller bolt and washer.
DO NOT INSERT SCREWDRIVER
CAUTION
BETWEEN IMPELLER VANES TO
PREVENT ROTATION OF CLOSE-COUPLED UNITS.
REMOVE CAP AT OPPOSITE END OF MOTOR. A
SCREWDRIVER SLOT OR A PAIR OF FLATS WILL BE
EXPOSED. USING THEM WILL PREVENT IMPELLER
DAMAGE.
8.3.4. Remove impeller by pulling axially.
8.3.5. Remove separator plate.
8.3.6. Remove shaft sleeve.
8.3.7. Remove intermediate stage.
8.3.8. Repeat steps 8.3.4 through 8.3.7 for three
stage pumps.
8.3.9. Remove last impeller.
8.3.10. Remove last separator plate.