Suction Piping; Discharge Piping; Motor To Pump Shaft Alignment - Xylem Goulds 3657 Instructions D'installation, D'utilisation Et D'entretien

CAUTION: DO NOT INSTALL WITH MOTOR
BELOW PUMP. ANY LEAKAGE OR
CONDENSATION WILL AFFECT
THE MOTOR.
2.2.2. Foundation must be flat and substantial to
eliminate strain when tightening bolts. Use rubber
mounts to minimize noise and vibration.
2.2.3. Tighten motor hold-down bolts before con-
necting piping to pump.
2.3. Frame-Mounted Units:
2.3.1. Bedplate must be grouted to a foundation with
solid footing. Refer to Fig. 1.
( 1 ")
∨
4
Finished grouting
( 1 to 3 ")
∨ ∨
2 4
Allowance
for leveling
Wood
frame
Figure 1
2.3.2. Place unit in position on wedges located at
four points (two below approximate center of driver
and two below approximate center of pump). Adjust
wedges to level unit. Level or plumb suction and
discharge flanges.
2.3.3. Make sure bedplate is not distorted and final
coupling alignment can be made within the limits of
movement of motor and by shimming, if necessary.
2.3.4. Tighten foundation bolts finger tight and build
dam around foundation. Pour grout under bedplate
making sure the areas under pump and motor feet
are filled solid. Allow grout to harden 48 hours be-
fore fully tightening foundation bolts.
2.3.5. Tighten pump and motor hold-down bolts
before connecting the piping to pump.

3. Suction Piping:

3.1. Low static suction lift and short, direct, suction pip-
ing is desired. For suction lift over 10 feet and liquid
temperatures over 120°F, consult pump performance
curve for Net Positive Suction Head Required.
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.
CAUTION: DO NOT USE SUCTION ISOLATION
VALVE TO THROTTLE PUMP.
4
Grout hole Base
Grout
Leveling wedges or shims – left in place
Top of foundation –
clean and wet down
Sleeve
Washer
Lug
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 Figs. 2-5.
H min.
D
Figure 2
3.0D
min.
1.5D
H min.
min.
D min.
D D
2
Figure 4

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.
5. Motor-to-Pump Shaft Alignment:
5.1. Close-Coupled Units:
5.1.1. No field alignment necessary.
5.2. Frame-Mounted Units:
5.2.1. Even though the pump-motor unit may have a
factory alignment, this could be disturbed in transit
and must be checked prior to running. See Fig. 6.
Figure 6
H min.
D
Figure 3
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 5
Parallel
Angular