Xylem IM014 User Manual

Installation, Operation and
Maintenance Instructions

G&L STAINLESS STEEL
Centrifugal Pump

Model SST-C and
Model SST-F

I. Important:

A. Inspect unit for damage. Report damage to carrier

immediately.

B. Electrical supply must be a separate branch circuit with fuses

or circuit breakers, wire sizes, etc., per National and Local
electrical codes. Install an all-leg disconnect switch near
pump. Caution: Always disconnect electrical power when
handling pump or controls.

C. Motors must be wired for proper voltage (check 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.

D. 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 proper overload.
Fusing is permissible if properly fused.

E. Three-Phase: Provide three-leg protection with proper

size magnetic starter and thermal overloads.

F. Maximum Liquid Temperatures:

212ºF (100º C) with standard seal.
250ºF (120º C) with optional high-temperature seal.

G. Maximum allowable operating pressure: 175 PSI.
H. Maximum Number of Starts per Hour: 20, evenly distributed.
I. Regular Inspection and Maintenance will increase service

life. Base schedule on operating time.

F. For frame-mounted pumps, permanent and solid foundation

is required for smooth operation. Bedplate must be grouted
to a foundation with solid footing.

G. 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, bringing coupling halves into reasonable alignment.
Level or plumb suction and discharge flanges.

H. 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.

I. 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 before further tightening
foundation bolts.

J. 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!

K. Angular alignment of the flanges can best be accomplished

using calipers at bolt locations (See illustration).

II. Installation:

A. Close-coupled units may be installed inclined or vertical.

Caution: Do not install with motor below pump. Condensa-

tion will build up in motor.

B. Locate pump as near liquid source as possible (Below level

of liquid for automatic operation).

C. Protect from freezing or floods.
D. Allow adequate space for servicing and ventilation.
E. For close-coupled pumps, the foundation must be flat and

substantial to eliminate strain when tightening bolts. Use
rubber mounts to minimize noise and vibration. Tighten
motor hold-down bolts before connecting piping to pump.

IM014R01

L. On frame-mounted units, tighten foundation, pump and

driver hold-down bolts before connecting piping to pump.

M.Avoid unnecessary fittings. Select sizes to keep friction

losses low.

N. After completing piping, rotate unit by hand to check for

binding. (Note: A screwdriver slot or flats are provided in end
of motor shaft.)

III. Alignment:

A. No field alignment is necessary on close-coupled pumps.
B. Even though the pump-motor unit may have a factory

alignment, in transit this alignment could be disturbed and
must be checked prior to running.

C. Check the tightness of all hold-down bolts before checking

the alignment.

D. If re-alignment is necessary, always move the motor. Shim

as required.

E. Final alignment is achieved when parallel and angular

requirements are achieved with both pump and motor hold­down bolts tight. Caution: Always recheck both alignments
after making adjustments.

F. Parallel misalignment exists when the shafts are not concen-

tric. Place dial indicator on one hub and rotate this hub 360º
while taking readings on the outside diameter of the other
hub. Parallel alignment occurs when Total Indicator Reading
is .005" or less.

G. Angular misalignment exists when the shafts are not parallel.

Place dial indicator on one hub and rotate this hub 360º
while taking readings on the face of the other hub. Angular
alignment is achieved when Total Indicator Reading is .005"
or less.

VI. Rotation:

A. Pumps are right-hand rotation (Clockwise when viewed from

the driver end). Switch power on and off. Observe shaft
rotation. On frame-mounted units, check rotation before
coupling pump to motor.

B. Single-Phase: Refer to wiring diagram on motor if rotation

must be changed.

C. Three-Phase: Interchange any two power supply leads to

change rotation.

VII. Operation:

A. Before starting, pump must be primed (free of air and

suction pipe full of liquid) and discharge valve partially open.
Caution: Pumped liquid provides lubrication. If pump is run
dry, rotating parts will seize and mechanical seal will be
damaged.

B. Make complete check after unit is run under operating

conditions and temperature has stabilized. Check for
expansion of piping. Check coupling alignment.

C. 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.

IV. Suction Piping:

A. Low static lift and short, direct suction piping is desired. For

suction lift over 15 feet, consult pump performance curve for
Net Positive Suction Head Required.

B. Suction pipe size must be at least equal to suction connec-

tion of pump.

C. If larger pipe is used, an eccentric pipe reducer (with straight

side up) must be used at the pump.

D. Installation with pump below source of supply:

1. Install isolation valve in piping for inspection and
maintenance.

2. Do not use suction isolation valve to throttle pump!

E. Installation with pump above source of supply:

1. To avoid air pockets, no part of piping should be higher
than pump suction connection. Slope piping upwards
from liquid source.

2. All joints must be airtight.

3. Foot valve to be used only if necessary for priming, or to
hold prime on intermittent service.

4. Suction strainer open area must be at least triple the
pipe area.

F. Size of inlet from liquid source, and minimum submergence

over inlet, must be sufficient to prevent air entering pump.

V. Discharge Piping:

A. Arrangement must include a check valve located between a

gate valve and the pump. The gate valve is for regulation of
capacity, or inspection of pump or check valve.

B. If reducer is required, place between check valve and pump.

2

VIII. Maintenance:

A. Bearings are located in and are part of the motor. For

lubrication procedure, refer to manufacturer’s instructions.

B. On frame-mounted units, regrease at 2,000 hours use or 3

months. Use #2 Sodium or Lithium grease and fill until
grease comes out of the relief fitting.

IX. Disassembly:

A. Turn power off.
B. Drain system. Flush if necessary.
C. Remove motor hold-down bolts on close-coupled or

disconnect coupling and remove spacer.

D. Remove casing bolts and pump hold-down bolts.
E. Remove motor and rotating element from casing.
F. Unscrew impeller bolt with a socket wrench. Do not insert

screwdriver between impeller vanes to prevent rotation.

It may be necessary to use a strap wrench around the
impeller if impacting the socket wrench will not loosen the
impeller bolt.

G. Remove impeller washer.
H. Insert two pry bars (180º apart) between impeller and seal

housing. Pry off impeller.

I. Remove seal spring, cupwasher and impeller key.
J. Remove seal housing, pulling with it the rotating seal parts.

(Pry bar slots provided where necessary.)

K. Place seal housing on flat surface. Press out stationary

seal parts.

L. Remove deflector from shaft on frame-mounted units.
M.Remove bolts holding bearing cover to frame and remove

bearing cover (frame-mount).

N. Remove lip seals from bearing frame and bearing cover

(frame-mount).