Xylem AC0922 GWT A-C Pump Series Close-Coupled and In-Line Centrifugal Pumps User Manual

A-c pump series, Close-coupled and in-line centrifugal pumps, Prime pump before starting

INSTRUCTION MANUAL

AC0922

A-C Pump Series

CLOSE-COUPLED and IN-LINE

CENTRIFUGAL PUMPS

Prime Pump Before Starting

Temperature - Total temperature, not the rise, is the measure of safe

operation for a motor. If temperature by thermometer exceeds limits for in-
sulation class, investigate and change operating conditions. When pump-
ing hot liquids, shaft may provide an unsafe temperature for packing or
bearings. In this case a jacketed stuffing box should be used, and cooled
with water from external source.

Insulation - Measure insulation resistance regularly. Refer to Motor or

Pump Maintenance Manuals, or to AIEE Standard No. 43.

Lubrication – Motor bearings are factory lubricated with grease to

give 6 months service for normal conditions. Relubricate bearings each
6 months for horizontal motors, for vertical motors top bearing each
6 months or 1 year depending on speed, bottom bearing each 3 or 6
months depending on speed. Relubricate as follows:

1. Stop the motor. Lock out the switch.

2. Thoroughly clean off and remove plugs from fill and drain lines.
3. Remove hardened grease from drains with stiff wire or rod.
4. Add grease to fill line with hand gun until small amount of new

grease is forced out drain. Agitate drain with wire or rod to aid
grease movement. Catch used greaser in suitable container.

5. Replace plugs in fill lines.
6. Put motor back in operation.
7. Run motor for at least one hour to expel excess grease, then

replace plugs in drain lines.

Packing Adjustment – Fiber packing should not be tightened to the

point of no leakage. Without some leakage packing may burn and score
shaft or sleeve. With new packing gradually take up gland with pump
running to control leakage as packing seats. New metallic packing may
smoke during run-in. When seated metallic packing forms a solid, bear-
ing-like surface. Adjust gland with pump running, for either type, to pro-
vide leakage of 40 to 60 drops per minute. Pipe away all leakage. Never
tighten gland with pump is idle.

(Running

Cont’d)

1. Check pump and piping for leaks. Repair immediately.
2. Record pressure gauge readings for future reference.
3. Record voltage, amperage per phase, and kw (if an indicating

wattmeter is available).

4. Check bearings for lubrication and temperature.
5. Check and adjust stuffing box for correct operation. Check seal-

ing water lines and valves.

6. Adjust pump output (capacity) ONLY with discharge valve.

DO NOT throttle suction line.

Shutdown –
1. Close discharge valve slowly.
2. Shut down the motor.
3. Close seal-liquid valves (for packed pumps). (If pumped liquid

is dirty or if inleakage is to be prevented, these external lines

should always be left open.)

4. Open drain valves as required.
5. Close suction line valves, to retain prime or to isolate pump.

Freezing Protection – Protect pumps shut down during freezing

conditions by one of the following methods:

1. Drain pump, remove all liquid from the casing.
2. Keep fluid moving in pump and insulate or heat the pump to

prevent freezing. If heated, do not let temperature go above 100°

to 150° F.

3. Fill pump completely with antifreeze solution.

Troubles – Watch for signs of pump trouble at all times. Immedi-

ately correct any trouble to avoid costly shut down and repair. Refer to

applicable maintenance manuals for list of symptoms and cures.
MAINTENANCE

Routine, regular maintenance is the best assurance of trouble-free,

long-life pump and motor operation. In addition to having trained per-

sonnel, the best way to insure regular maintenance is by use of Pump

and Motor Service Records (forms available on request to A-C Pump).

Several more important items of good maintenance are (include others

for adverse or unusual conditions):

Periodic Inspection – Each month measure bearing temperature

by thermometer. If hot there may be too much grease. If not corrected

by grease change, disassemble and inspect bearings.

Every 6 months check packing, shaft or shaft sleeve for scoring,

and alignment of piping with pump.

Each year remove rotating element to inspect and clean thorough-

ly. Clean stuffing box passages or piping (if external). Inspect and clean

check and foot valves.

Cleaning – Remove oil, dust, dirt, water, chemicals from exterior of

motor and pump. Keep motor air inlet and outlet open. Blow out interior

of open motors with clean, compressed air at low pressure. Regularly

drain moisture from TEFC motors.

Labeled Motors - It is imperative for repair of a motor with Un-

derwriters’ Laboratories label that original clearances be held, that all

plugs, screws, other hardware be fastened securely, and that part re-

placements be exact duplicates or approved equals. Violation of any of

the above invalidates Underwriters’ label.

NOTE – Refer to Maintenance Manuals for other procedures applicable only

to vertical motors. Inner cap of top bearing must be inspected and grease re-

moved, or a procedure followed that provides grease above bearing and does

not completely fill inner cap.

Xylem Inc.

8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xyleminc.com/brands/gouldswatertechnology