Piping Suction; Discharge; Wiring And Grounding; Coupling Alignment - Xylem 3642 Manual De Instruccion

ing sure the areas under the pump and motor feet
are filled solid. Allow grout to harden 48 hours before
fully tightening foundation bolts.
Tighten pump and motor hold-down bolts before
aligning shaft or connecting the piping to pump.
PIPING
Piping should be no smaller than pump's discharge
and suction connections and kept as short as possible,
avoiding unnecessary fittings to minimize friction
losses.
All piping MUST be independently supported and
MUST NOT place any piping loads on the pump
NOTICE: DO NOT FORCE PIPING INTO PLACE
AT PUMP SUCTION AND DISCHARGE
CONNECTIONS.
All pipe joints MUST be airtight.
Piping – Suction
For suction lifts over 15 ft. (4.6 m), consult pump per-
formance curve for net positive suction head required
R
(NPSH ).
If a pipe size larger than pump suction is required,
an eccentric pipe reducer, with the straight side up,
MUST be installed at the pump suction.
If pump is installed below the liquid source, install
a gate valve in the suction for pump inspection and
maintenance.
NOTICE: DO NOT USE THE GATE VALVE TO
THROTTLE PUMP. THIS MAY CAUSE LOSS
OF PRIME, EXCESSIVE TEMPERATURES
AND DAMAGE TO PUMP, VOIDING
WARRANTY.
If the pump is installed above the liquid source, the
following MUST be provided:
To avoid air pockets, no part of the piping should
be above the pump suction connection.
Slope the piping upward from liquid source.
Use a foot valve or check valve ONLY if neces-
sary for priming or to hold prime during intermit-
tent duty.
The suction strainer or suction bell MUST be at
least three times the suction pipe diameter area.
Insure that the size and minimum submergence
over suction inlet is sufficient to prevent air from
entering pump through a suction vortex. See Fig-
ures 2 through 5.
Piping – Discharge
Install a check valve suitable to handle the flow, liq-
uids and to prevent backflow. After the check valve,
install an appropriately sized gate valve to be used to
regulate the pump capacity, pump inspection and for
maintenance.
When required, pipe increaser should be installed
between the check valve and the pump discharge.
4
H min.
D
Figure 2
3.0D
min.
1.5D
H min.
min.
D min.
D D
2
Figure 4

WIRING AND GROUNDING

Install, ground and wire ac-
WARNING
cording to local and National
Electrical Code Requirements.
Install an all leg disconnect
switch near the pump.
Disconnect and lockout electri-
Hazardous voltage
can shock, burn or
cal power before installing or
cause death.
servicing the pump.
Electrical supply MUST match pump's name-
plate specifications. Incorrect voltage can cause
fire, damage to the motor and voids the war-
ranty.
Motors not protected MUST be provided with
contactors and thermal overloads for single
phase motors, or starters with heaters for three
phase motors. See motor nameplate.
Use only copper wire to motor and ground. The
ground wire MUST be at least as large as the wire to
the motor. Wires should be color coded for ease of
maintenance.
Follow motor manufacturer's wiring diagram on the
motor nameplate or terminal cover carefully.
FAILURE TO PERMANENTLY
WARNING
GROUND THE PUMP, MOTOR AND
Hazardous
CONTROLS BEFORE CONNECTING
voltage
TO ELECTRICAL POWER CAN CAUSE
SHOCK, BURNS OR DEATH.

COUPLING ALIGNMENT

FAILURE TO DISCONNECT AND
WARNING
LOCKOUT ELECTRICAL POWER
BEFORE ATTEMPTING ANY
MAINTENANCE CAN CAUSE SEVERE
PERSONAL INJURY.
Hazardous machinery
can cause personal
injury or death.
H min.
D
Figure 3
H
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1 2 3 4 5 6 7 8 9 10111213141516 V
V = Velocity in feet per second
= GPM x 0.321 PM x 0.4085
Area D 2
Figure 5