Xylem IM083 R05 Model HMS - Manual (Page 3)

3
Description and Specifications
The Model HMS is a close coupled, end suction, multi-
stage centrifugal pump for general liquid transfer service,
booster applications, etc. Liquid-end construction is all
AISI Type 316 stainless steel, stamped and welded.
Impellers are fully enclosed, non-trimmable to
intermediate diameters. Casings are fitted with diffusers
for efficiency and for negligible radial shaft loading.
All units have NEMA 48Y or 56Y motors with square
flange mounting and threaded shaft extension.
1. Important Instructions
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 compliance
with National and Local electrical codes. Install an all-
leg disconnect switch near pump.
CAUTION: 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
voltage at motor terminals, or motor life and pump
performance 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 provided, use a contactor with a
proper 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: 230ºF (110ºC)
Working Pressure to: 125 PSI (8 Bar)
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.
CAUTION: NEVER DRAW PIPING INTO PLACE BY
FORCING THE PUMP SUCTION AND
DISCHARGE CONNECTIONS.
2.5 Avoid unnecessary fittings. Select sizes to keep friction
losses to a minimum.
2.6 Units may be installed horizontally, inclined or
vertically.
CAUTION: DO NOT INSTALL WITH MOTOR
BELOW PUMP. ANY LEAKAGE OR
CONDENSATION WILL AFFECT THE
MOTOR.
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 piping
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.
CAUTION: 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 1-4.
3.7 Use 3-4 wraps of Teflon tape to seal threaded
connections.
Figure 2
Figure 5
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 10 11 12 13 14 15 16 V
H
=
Min.
Submergence
in
feet
V = Velocity in feet per second
=GPM x 0.321 GPM x 0.4085
Area D 2
Figure 4
1.5D
min.
3.0D
min.
D D
H min.
D min.
2
---------
--------- D
H min.
Figure 3
D
H min.
--------- ---------
Figure 3 Figure 4
Figure 1 Figure 2