Discharge Piping; Rotation; Operation; Maintenance - Xylem Goulds LC Manuel D'instructions

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 sub-
mergence over inlet, must be sufficient to prevent air
entering pump through vortexing. See Figures 1-4.
3.7 Use 3-4 wraps of Teflon™ tape to seal threaded
connections.
H min.
D
Figure 1
3.0D
min.
1.5D
H min.
min.
D min.
D D
2
Figure 3

4. DISCHARGE PIPING

4.1 Allowance should be made for disconnecting dis-
charge piping near casing to allow for pump disas-
sembly.
4.2 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.
4.3 If an increaser is required, place between check valve
and pump.
4.4 Use 3-4 wraps of Teflon tape to seal threaded
connections.
4
H min.
D
Figure 2
H
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
V
1 2 3 4 5 6 7 8 9 10111213141516
V = Velocity in feet per second
= GPM x 0.321 GPM x 0.4085
Area D 2
Figure 4

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. To change rota-
tion:
5.1.1 Single-phase motor: Non-reversible
5.1.2 Three-phase motor: Interchange any two
power supply leads.

6. OPERATION

6.1 Before starting, pump must be primed (free of air
and suction pipe full of liquid) and discharge valve
partially open.
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

8.1 Complete disassembly of the unit will be described.
Proceed only as for as required to perform the main-
tenance work required.
8.1.1 Turn off power.
8.1.2 Drain system and flush if necessary.
8.1.3 Disconnect discharge pipe from pump.
8.1.4 Remove motor hold-down bolts.
8.2 Disassembly of Liquid End
8.2.1 Remove casing screws and nuts.
8.2.2 Remove back pull-out assembly from casing.
8.2.3 Remove the first stage diffuser cover and casing
o-ring.
8.2.4 Remove motor fan cover to expose wrench flats
or slot on shaft end.
8.2.5 Hold shaft at flats to resist rotation, and
remove impeller nut and washer.
DO NOT INSERT SCREWDRIVER
CAUTION
BETWEEN THE FAN BLADES TO PRE-
VENT ROTATION.
NOTE: Notice the location of anti-rotation tabs and
holes on items 10, 11, 12 and 13 these must be
aligned and engaged for reassembly.
8.2.6 Remove the first stage impeller, impeller spacer,
intermediate diffuser and last stage diffuser
cover.