Goulds Pumps 3498 - IOM - Manual (Page 36)

Pump Efficiency
Pump efficiency can be calculated by the formula:
Pump Efficiency = Total head x GPM x specific gravity
3960 x Bph
VIBRATION
The acceptable vibration level of a centrifugal pump
depends on the rigidity of the pump and the supporting
structure. Recommended values for vibration can vary
depending on the operating characteristics and the
structure. Refer to the standards of the “Hydraulic
Institute” for the complete description and charts on various
structures.
ELECTRICAL REQUIREMENTS
Motor (Also See Separate Motor Instructions)
If the motor is sized to operate near full load at the rated
head and capacity of the pump, a watt-meter should be
installed to record input power to the motor. If motor
efficiency is known, the shaft horsepower may be
calculated and checked against the motor rating.
A motor operating outside its service factor will overheat and
could possibly burn out. Motors are usually rated with
normal temperature requirements stamped on the data plate.
NOTE: A motor which feels hot to the touch of the
hand is not necessarily running hot. Check with an
accurate temperature measuring device to be sure. A
motor operating outside its service factor will overheat
and could possibly burn out. Motors are usually rated
with normal temperature requirements stamped on the
data plate.
Conduit Box
Conduit boxes are mounted on the motors at lead access
openings. Conduit boxes are normally provided for main
power leads and other special accessories, such as space
heaters, temperature alarms and control features.
The conduit box openings are sized as shown on the motor
dimension drawing, and threaded for using standard rigid
or flexible conduit. They may be assembled with conduit
openings at any of four (4) 90° positions.
Motor Controls – General
Motor controls should conform to all the electrical data
stamped on the motor data plate. Complete instructions for
installation, operation, and maintenance are included with
the controlling device.
External Wiring
Wiring to the motor should be installed in conformance
with the National Electrical Code and any local codes.
3498 IOM 12/04
33
4