2.2.3
Oil-Level Gauge
An oil-level gauge for each oil reservoir, with scale of sufficient length
to indicate the oil level at all room and operating temperatures, shall be
provided. The gauges shall be located near the reservoirs in an approved,
accessible location where they can be easily read. Each oil-level gauge
shall have adjustable high and low oil-level ungrounded alarm contacts
suitable for 120 volts ac.
2.3
PIPING
All piping systems within the motor for bearings, including valves and
fittings, shall be designed and furnished by the Contractor. The
Contractor shall bring these connections out to approved positions at the
bottom of the stator frame. All piping shall be clean inside and where
ending in open connections for other work, ends shall be capped for
protection. Valves and other operating devices shall be easily accessible,
and gauges and indicating devices shall be mounted on a control panel as
approved by the Contracting Officer. Piping and fittings shall be of
copper or brass as required. Valves shall have bronze seats and stems and
shall be suitable for the service intended. At all points where the piping
system must be disconnected for dismantling operations, bolted flange
connections or unions shall be provided. Arrangement of piping and
location of valves and joints shall be such that there will be a minimum of
disturbance to piping or interference with other service when the motor is
dismantled or parts are removed for inspection or repairs.
2.4
WINDING SPACE HEATERS
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NOTE: The inclusion or omission of "Winding Space
Heaters" will depend upon the decision reached after
giving due consideration to the problem of
prevention of moisture condensation on the station
equipment.
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Heaters shall be installed in the lower section of the frame or wrapped
around the winding end turns. They shall be designed for operation on 120
volts, single-phase, 60-Hz, alternating current and of sufficient capacity
or wattage that, when energized, they will hold the temperature of the
motor windings approximately 10 degrees C above the ambient temperature.
Heaters shall be de-energized when motor is operating.
2.4.1
Construction
The heaters, except for wrap-around type, shall be of the tubular type,
constructed with a chrome-nickel heating element embedded in a refractory
insulating material, and encased in an approved watertight metal sheath.
They shall be designed for continuous operation and have a maximum watt
density of 20 watts per square inch. The rate of heat dissipation shall be
uniform throughout the effective length of the heater. Cartridge-type
heaters of equivalent construction, as approved by the Contracting Officer,
will be acceptable. Heaters installed around the winding end turns shall
consist of the required turns of heating cable wrapped around the end turns
and secured in place before the winding is impregnated.
SECTION 16222A
Page 22
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