Description And Specifications; Suction Piping - ITT Goulds Pumps MCC Instrucciones De Instalación, Operación Y Mantenimiento

DESCRIPTION and SPECIFICATIONS:

The Model MCC is a close coupled, end suction, centrifugal
pump for general liquid transfer service, booster applications, etc.
Liquid-end construction is cast iron and AISI Type 316 stainless
steel. Impellers are fully enclosed, non-trimmable to intermediate
diameters.
All units have NEMA 48Y or 56Y motors with square flange
mounting and threaded shaft extension.
1. Important
1.1. Inspect unit for damage. Report any damage to carrier/dealer
immediately.
1.2. Electrical supply must be a separate branch circuit with fuses
or circuit breakers, wire sizes, etc., in compliance with
National and Local electrical codes. Install an all-leg
disconnect switch near pump.
CAUTION
Always disconnect electrical power when handling pump or
controls.
1.3. Motors must be wired for proper voltage. Motor wiring
diagram is on motor 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.
1.4. Always use horsepower-rated switches, contactor and starters.
1.5. Motor Protection
1.5.1. 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 a proper
overload. Fusing is permissible.
1.5.2. Three-phase: Provide three-leg protection with properly
sized magnetic starter and thermal overloads.
1.6. Maximum Operating Limits:
Liquid Temperature:212ºF (100ºC) with standard seal
250ºF (120ºC) with high temperature
seal.
Working Pressure: 75 PSI with standard seal
125 PSI with optional seals.
Starts per Hour: 20, evenly distributed.
1.7. Regular inspection and maintenance will increase service life.
Base schedule on operating time. Refer to Section 8.
2. Installation
2.1. Locate pump as near liquid source as possible (below level of
liquid for automatic operation).
2.2. Protect from freezing or flooding.
2.3. Allow adequate space for servicing and ventilation.
2.4. All piping must be supported independently of the pump, and
must "line-up" naturally.
CAUTION
Never draw piping into place by forcing the pump suction and
discharge connections.
2.5. Avoid unnecessary fittings. Select sizes to keep friction losses
to a minimum.
2.6. Units may be installed horizontally, inclined or vertically.
CAUTION
Do not install with motor below pump. Any leakage or
condensation will affect the motor.
2
2.7. Foundation must be flat and substantial to eliminate
strain when tightening bolts. Use rubber mounts to minimize
noise and vibration.
2.8. Tighten motor hold-down bolts before connecting piping
to pump.

3. Suction Piping

3.1. Low static suction lift and short, direct, suction piping is
desired. 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 Figures 2 through 5.
3.7. Use 3 to 4 wraps of Teflon tape to seal threaded connections.
H min.
D
Figure 2
3.0D
min.
1.5D
H min.
min.
D min.
D D
2
Figure 4
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 GPM x 0.4085
2
Area D
Figure 5