Xylem IM136 R01 SM Centrifugal Pump - Manual (Page 3)

3
Description and Specifications
This is a close coupled, end suction, centrifugal pump for
general liquid transfer service, booster applications, etc.
Liquid-end construction is cast iron and AISI Type 316
stainless steel. Impellers are fully enclosed, non-trimma-
ble to intermediate diameters.
All units have NEMA 48Y or 56Y motors with square
flange mounting and threaded shaft extension.
1. Important
1.1. Inspect unit for damage. Report any damage to car-
rier/dealer immediately.
1.2. Electrical supply must be a separate branch circuit
with fuses or circuit breakers, wire sizes, etc., in compli-
ance with National and Local electrical codes. Install an
all-leg disconnect switch near pump.
Always disconnect electrical power when
handling pump or controls.
1.3. Motors must be wired for proper voltage. Motor
wiring diagram is on motor nameplate. Wire size must
limit maximum voltage drop to 10% of nameplate volt-
age at motor terminals, or motor life and pump perfor-
mance will be lowered.
1.4. Always use horsepower-rated switches, contactor and
starters.
1.5. Motor Protection
1.5.1. Single-phase: Thermal protection for single-
phase units is sometimes built in (check
nameplate). If no built-in protection is provid
ed, use a contactor with a proper over
load. Fusing is permissible.
1.5.2. Three-phase: Provide three-leg protection
with properly sized magnetic starter and
thermal overloads.
1.6. Maximum Operating Limits:
Liquid Temperature: 212ºF (100ºC) with standard seal
250ºF (120ºC) with high
temperature seal.
Working Pressure: 75 PSI with standard seal
125 PSI with optional seals.
Starts per Hour: 20, evenly distributed.
1.7. Regular inspection and maintenance will increase service
life. Base schedule on operating time. Refer to Section 8.
2. Installation
2.1. Locate pump as near liquid source as possible (below
level of liquid for automatic operation).
2.2. Protect from freezing or flooding.
2.3. Allow adequate space for servicing and ventilation.
2.4. All piping must be supported independently of the
pump, and must “line-up” naturally.
Never draw piping into place by forcing the
pump suction and discharge connections.
2.5. Avoid unnecessary fittings. Select sizes to keep fric-
tion losses to a minimum.
2.6. Units may be installed horizontally, inclined or vertically.
Do not install with motor below pump.
Any leakage or condensation will affect
the motor.
H min.
D D
H min.
D D
1.5D
min.
3.0D
min.
H min.
D min.
2
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
H
1 2 3 4 5 6 7 8 9 10111213 141516 V
V = Velocity in feet per second
= GPM x 0.321
Area
GPM x 0.4085
D 2
Figure 3 Figure 4
Figure 1 Figure 2
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 motor hold-down bolts before connecting
piping to pump.
3. Suction Piping
3.1. Low static suction lift and short, direct, suction pip-
ing is desired. 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.
Do not use suction isolation 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
connections.
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.
Description and Specifications
1. Important
CAUTION
2. Installation
CAUTION
CAUTION
3. Suction Piping
CAUTION
4. Discharge Piping