Discharge Piping; Rotation; Operation; Maintenance - Xylem Goulds LB Manual De Instrucciones

3.2 Suction pipe must be at least as large as the suc-
tion 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 prim-
ing, 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 2-5.
3.7 Use 3-4 wraps of teflon tape to seal threaded con-
nections.
H min.
---------
D
---------
Figure 1
3.0D
min.
1.5D
H min.
min.
min.
D
D D
2
Figure 3

4. DISCHARGE PIPING

4.1 Allowance should be made for disconnecting
discharge piping near casing to allow for pump

disassembly.

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 10 11 12 13 14 15 16
V = Velocity in feet per second
=GPM x 0.321 GPM x 0.4085
2
Area D
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
rotation:
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 oper-
ating conditions and temperature has stabilized.
Check for expansion of piping.

7. MAINTENANCE

7.1 Ball bearings are located in and are part of the
motor. They are permanently lubricated. No greas-
ing required.
PUMPED LIQUID PROVIDES
CAUTION
LUBRICATION. IF PUMP IS RUN DRY,
ROTATING 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 far as required to
perform the maintenance work required.
8.1.1 Turn off power.
8.1.2 Drain system and flush if necessary.
8.1.3 Remove motor hold-down bolts.
8.2 Disassembly of liquid end:
8.2.1 Remove casing screws (3).
8.2.2 Remove back pull-out assembly from casing.
8.2.3 Remove nozzle/venturi assembly (6) and
o-rings (5, 7).
8.2.4 Remove guidevane (8).
DO NOT INSERT SCREWDRIVER
CAUTION
BETWEEN THE FAN BLADES TO
PREVENT ROTATION.
8.2.5 Remove impeller (9) by rotating in a
counterclockwise direction.
NOTE: For single and three phase motors,
remove the motor end cover and hold the
flats on the shaft with a wrench to stop
rotation.