motor.
b.
Lube Oil Heater: Provide thermostatically controlled electric
heater in lubrication oil sump of sufficient capacity to heat up
and maintain manufacturer's recommended oil temperature when unit
is cold at [_____] [0 degrees C] [32 degrees F] ambient. Provide
low oil level indicator with light for protection of heater.
2.3.7
2.3.7.1
Main Electric Drive Motor
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NOTE: Polyphase motors shall be selected on
requirements of the driven equipment, service
conditions, motor power factor, life cycle cost, and
high efficiency in accordance with NEMA MG 10.
Use Motor Master software program to identify the
most efficient and cost effective polyphase motor
for a specific application. Motor Master is located
in the "TOOLS" section of Construction Criteria
Base (CCB). For additional guidance contact Charles
Mandeville of the NAVFAC Criteria Office at (757)
322-4208. Another source of information on energy
efficiency is E-source, accessible to Navy users on
the Naval Facilities Engineering Service Center
(NFESC) energy home page http://energy.navy.mil/.
**************************************************************************
The main drive motor for each compressor shall be [an induction,] [or] [a
sychronous] motor, [_____] kilowatt (kW) horsepower (hp), with a continuous
service factor of 1.0. Size the motor so that the name plate kW hp rating
is not exceeded under the entire range of operating conditions specified.
Efficiency and losses shall be determined in accordance with IEEE Std 112.
Unless otherwise specified horizontal polyphase squirrel cage motors rated
one to 125 horsepower shall be tested by dynamometer Method B as described
in Section 6.4 of IEEE Std 112. Motor efficiency shall be calculated
using Form B of IEEE Std 112 calculation procedures. Polyphase motors
larger than 125 horsepower shall be tested in accordance with IEEE Std 112
with stray load loss determined by direct measurement or indirect
measurement (test loss minus conventional loss). The efficiency shall be
identified on the motor nameplate by the caption NEMA Nominal efficiency or
NEMA Nom eff. Electrical service will be as specified. Motor shall be
designed for reduced voltage starting [at [50] [65] [80] percent of full
voltage], allowing for characteristics of the connected load, and shall
start without undervoltage tripping. Provide resistance temperature
detectors (RTD) attached to or imbedded in motor winding for control
system. The motor shall meet the requirements of NEMA MG 1 with Class F
insulation. Provide space heaters for protection of windings during motor
shutdowns.
2.3.7.2
Accessory and Related Equipment Motors
Motors less than 3/8 kW 1/2 hp shall be single-phase induction motors and
shall conform to NEMA MG 1. Motors 3/8 through 3.75 kW 1/2 through 5 hp
shall be three-phase induction motors and shall conform to NEMA MG 1.
Single-phase and three-phase motors shall have bimetallic disk thermostats
attached to or imbedded in the motor winding. Motors shall have NEMA MG 1
SECTION 15215N
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