ITT Goulds Pumps G&L Serie Instrucciones De Instalación, Operación Y Mantenimiento página 8

4. PIPING
Discharge and suction piping should be no smaller
than the respective pump opening and should be
kept as short as possible, avoiding unnecessary fit-
tings to minimize friction losses.
NOTICE: PIPING MUST BE INDEPENDENTLY SUP-
PORTED AND NOT PLACE ANY PIPING
LOADS ON THE PUMP .
If suction piping larger than pump suction is re-
quired, an eccentric pipe reducer, WITH THE
STRAIGHT SIDE UP, must be installed at the pump
suction.
If the pump is installed below the liquid source,
install a full flow isolation valve in the suction piping
for pump inspection or maintenance.
NOTICE: DO NOT USE THE ISOLATION VALVE
ON THE SUCTION SIDE OF THE PUMP
TO THROTTLE PUMP . THIS MAY CAUSE
LOSS OF PRIME, EXCESSIVE TEMPERA-
TURES, DAMAGE TO PUMP AND VOID
WARRANTY.
If pump is installed above the liquid source, the fol-
lowing MUST be provided:
To avoid air pockets, no part of the suction pip-
ing should be above the pump suction.
On any horizontal piping sections, slope piping
upward from liquid source.
All suction pipe joints MUST be airtight.
Use a foot valve for priming, or for holding
prime during intermittent duty.
The suction strainer or suction bell MUST be at least
3 times the suction pipe diameter.
Insure that the size and minimum liquid submer-
gence, over the suction inlet, is sufficient to prevent
air from entering through a suction vortex. See typi-
cal suction piping Figures 1 through 4.
Install a discharge check valve, suitable to handle the
flow and liquids, to prevent backflow.
Install an appropriately sized gate valve, AFTER the
discharge valve, to regulate the pump capacity, for
pump inspection and for maintenance.
When a pipe increaser is required, install between
the check valve and the pump discharge.
H min.
D
Figure 1
D
8D
min.
4D
H min.
min.
min.
3D
3D 3D
2
Figure 3
8
H min.
D
Figure 2
H
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 V
V = Velocity in feet per second
= GPM x 0.321 GPM x 0.4085
Area D
2
Figure 4
5. SHAFT ALIGNMENT – MOTOR TO PUMP
When the pump is purchased less motor, the pump
will be supplied with a motor assembly shim posi-
tioned between the motor adapter and the coupling.
To assemble the motor to the pump remove the
plastic shipping straps, the  stainless steel coupling
guard halves, and the expanded polyurethane.
Insure that the motor assembly shim is properly posi-
tioned between the coupling and the motor adapter.
If the motor assembly shim is not available, a 0.03"
(5 mm) shim may be used to locate the pump shaft
assembly and to set the correct height. See figures
below.
0.203"
(5 mm)
Shim
For motor frame sizes 13TC and larger, attach the
motor adapter flange to the motor using 4 hex cap
screws. Torque to values shown in the "ENGINEER-
ING DATA" section of this manual.
Loosen the 4 coupling socket head screws enough
to provide an adequate opening in the coupling to
receive the motor shaft.
With an adequately sized crane, carefully lower
the motor assembly onto the pump motor adapter
and into the coupling. Secure the 4 motor hex cap
screws, torquing to the value provided in the "EN-
GINEERING DATA" section of this manual.
Torque the 4 coupling socket head screws to the
value provided in "ENGINEERING DATA" section
of this manual. After assembly, the gap between the
coupling halves should be equal.
0.203"
(5 mm)