Bell & Gossett P81845B Series 3530 Centrifugal Pumps - Manual (Page 3)

PUMP LOCATION
Locate the pump so there is sufficient room for inspection,
maintenance and service. If the use of a hoist or tackle is
needed, allow ample head room.
The best pump location for sound and vibration absorption is
on a concrete floor with sub soil underneath. If the pump loca-
tion is overhead, special precautions should be undertaken to re-
duce possible sound transmission, consult a sound specialist.
If the pump is not installed on a closed system, it should be
placed as near as possible to the source of liquid supply, and
located to permit installation with the fewest number of bends
or elbows in the suction pipe.
The installation must be evaluated to determine that the Net
Positive Suction Head Available (NPSHA) meets or exceeds
the Net Positive Suction Head Required (NPSHR), as stated by
the pump performance curve.
1. IMPORTANT
1.1 Do not install and operate ITT Bell & Gossett Pumps,
3D Valves, Suction Diffusers, etc., in closed systems
unless the system is constructed with properly sized
safety devices and control devices. Such devices
include the use of properly sized and located pressure
relief valves, compression tanks, pressure controls,
temperature controls, and flow controls as appropriate.
If the system does not include these devices, consult
the responsible engineer or architect before making
pumps operational.
1.2 Inspect unit for damage. Report any damage to
carrier/dealer immediately.
1.3 Electrical supply must be a separate branch circuit
with fuses or circuit breakers, wire sizes, etc., per
National and Local electrical codes. Install an all-leg
disconnect switch near pump.
1.4 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.
1.5 Always use horsepower-rated switches, contactor and
starters.
1.6 Motor Protection
1.6.1 Single-phase: Thermal protection for single-
phase units is sometimes built in (check name-
plate). If no built-in protection is provided, use
a contactor with a proper overload. Fusing is
permissible.
1.6.2 Three-phase: Provide three-leg protection with
properly sized magnetic starter and thermal
overloads.
1.7 Maximum Operating Limits:
Liquid Temperature: 212°F (100°C) with standard seal.
250°F (120°C) with optional high
temp seal.
Pressure: 125 PSI.
Starts Per Hour: 20, evenly distributed.
1.8 Regular inspection and maintenance will increase ser-
vice life. Base schedule on operating time. Refer to
Section 8.
2. INSTALLATION
2.1 General
2.1.1 Locate pump as near liquid source as possible
(below level of liquid for automatic operation).
2.1.2 Protect from freezing or flooding.
2.1.3 Allow adequate space for servicing and ventilation.
2.1.4 All piping must be supported independently of
the pump, and must “line-up” naturally.
2.1.5 Avoid unnecessary fittings. Select sizes to keep
friction losses to a minimum.
2.2 Units may be installed horizontally, inclined or vertically.
2.3 Foundation must be flat and substantial to eliminate
strain when tightening bolts. Use rubber mounts to
minimize noise and vibration.
2.4 Tighten motor hold-down bolts before connecting pip-
ing 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 tem-
perature over 120°F, consult pump performance curve
for Net Positive Suction Head Required.
3
WARNING: Excessive Pressure Hazard
WARNING: Volumetric Expansion
The heating of water and other fluids causes volumetric
expansion. The associated forces may cause failure of sys-
tem components and release of high temperature fluids. This
will be prevented by installing properly sized and located
compression tanks and pressure relief valves.
Failure to follow these instructions could result in serious
personal injury or death, and property damage.
CAUTION: Always disconnect electrical power
when handling pump or controls.
Failure to follow these instructions could result in serious
personal injury or death, and property damage.
CAUTION: Never draw piping into place by forcing
the pump suction and discharge connections.
Failure to follow these instructions could result in serious
personal injury or death, and property damage.
CAUTION: Do not install with motor below pump.
Any leakage or condensation will affect the motor.
Failure to follow these instructions could result in serious
personal injury or death, and property damage.