Suction Piping; Discharge Piping; Motor-To-Pump Shaft Alignment - ITT G&L Pumps NPE Manual De Instrucciones

2.3.2. 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.
Level or plumb suction and discharge flanges.
2.3.3. 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.
2.3.4. 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 fully tightening foundation bolts.
2.3.5. Tighten pump and motor hold-down bolts before
connecting the piping to pump.

3. Suction Piping:

3.1. Low static suction lift and short, direct, suction piping is
desired. For suction lift over 10 feet and liquid temperatures over
120 F, 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 Figs. 2-5
3.7. Use 3-4 wraps of Teflon tape to seal threaded connections.
H min.
D
Figure 2
3.0D
min.
1.5D
H min.
min.
min.
D
D D
2
Figure 4
2
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 10 11 12 13 14 15 16
V = Velocity in feet per second
=GPM x 0.321 GPM x 0.4085
2
Area D
Figure 5

4. Discharge Piping:

4.1. Arrangement must include a check valve located between a gate
valve and the pump. The gate valve is for regulation of capacity, or
for inspection of the pump or check valve.
4.2. If an increaser is required, place between check valve and
pump.
4.3. Use 3-4 wraps of Teflon tape to seal threaded connections.

5. Motor-To-Pump Shaft Alignment:

5.1. Close-Coupled Units:
5.1.1. No field alignment necessary.
5.2. Frame-Mounted Units:
5.2.1. Even though the pump-motor unit may have a factory
alignment, this could be disturbed in transit and must be
checked prior to running. See Fig. 6.
5.2.2. Tighten all hold-down bolts before checking
the alignment.
5.2.3. If re-alignment is necessary, always move the motor.
Shim as required.
5.2.4. Parallel misalignment - shafts with axis parallel but not
concentric. Place dial indicator on one hub and rotate this hub
360 degrees while taking readings on the outside diameter of
the other hub. Parallel alignment occurs when Total Indicator
Reading is .005", or less.
5.2.5. Angular misalignment - shafts with axis concentric but
not parallel. Place dial indicator on one hub and rotate this hub
360 degrees while taking readings on the face of the other hub.
Angular alignment is achieved when Total Indicator Reading
is .005", or less.
5.2.6. Final alignment is achieved when parallel and angular
requirements are satisfied with motor hold-down bolts tight.
Always recheck both alignments after making any adjustment.
6. Rotation:
6.1. Correct rotation is right-hand (clockwise when viewed from
the motor end). Switch power on and off quickly. Observe shaft
rotation. To change rotation:
6.1.1. Single-phase motor: Non-reversible.
6.1.2. Three-phase motor: Interchange any two power supply
leads.
7. Operation:
7.1. Before starting, pump must be primed (free of air and suction
pipe full of liquid) and discharge valve partially open.
Pumped liquid provides lubrication. If pump is run dry,rotating
V
parts will seize and mechanical seal will be damaged. 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.
Parallel
Angular
Figure 6
CAUTION
CAUTION