If required an auxiliary-motor-driven circulating oil pump, rated at 480
volts, three-phase, with electrical leads terminated in a special terminal
box on the motor, and an oil pressure sensing device shall be included in
the bearing oil cooler system. The cooler system shall be constructed so
that the thrust bearing can be readily inspected or removed for repairs. A
water flow indicator with adjustable alarm contacts shall be included in
the water supply line. The oil reservoir shall have an oil-level gauge
with high and low level normally open contacts rated 120 volts ac.
2.1.11.6
Temperature Detectors
A standard copper resistance-type temperature detector, with a resistance
of 10 ohms at 25 degrees C 75 degrees F, shall be provided for each
bearing. Casings shall be made of copper. Detectors shall be wired in
accordance with paragraph ACCESSORY WIRING AND BOXES.
2.1.12
Nameplate
Each motor shall have a nameplate listing motor characteristics in
accordance with NEMA MG 1 paragraph 21.61. A separate starting information
nameplate shall be furnished as specified in paragraph OPERATING
CHARACTERISTICS.
2.2
INSTRUMENTS AND GAUGES
The following instruments and gauges shall be furnished.
2.2.1
Thermometers
Indicating thermometers, 150 mm Six-inch vapor-tension [dial-type]
[digital], with adjustable ungrounded alarm contacts suitable for 120 volts
ac shall be provided for (a) the thrust bearing, (b) the thrust bearing oil
reservoir, and (c) each guide bearing. The bulbs shall be located so as to
indicate the temperatures of the hottest parts. The thermometers shall be
mounted on a thermometer panel furnished by the Contractor and located on
the motor housing at a location approved by the Contracting Officer.
Adequate length of tubing shall be provided with each thermometer. The
bulb and tubing shall be insulated where necessary to prevent bearing
currents. [The dial-type thermometers shall be of the [round][square]
semiflush type with black cases, white dials, and black figures and
pointers.] [The digital thermometers shall be square, semiflush type with
black cases and minimum one (1) inch high display.]
2.2.2
Temperature Relay
A pneumatic bearing temperature relay having two sets of electrically
independent contacts, located close to the babbitt of the thrust bearing
[and each guide bearing] shall be provided. Each relay shall close its
contacts when the bearing temperature reaches approximately 105 degrees C
220 degrees F. The contacts shall have a current-carrying capacity of not
less than 10 amperes, shall be ungrounded, and shall be suitable for 120
volts ac. The relays shall be mounted in an approved accessible location
and the leads brought to a terminal block mounted on the stator frames in
an approved location. The bulbs for the temperature relays shall be easily
accessible and constructed for removal and testing without disturbing the
bearing or bearing housing. The tubing shall be insulated where necessary
to prevent bearing currents.
SECTION 16222A
Page 21
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