separately driven prelube lubrication oil pump for start-up and standby.
System shall be factory assembled and tested. The oil reservoir shall
retain a minimum 3-minute oil supply. Lubricating oil shall conform to
MIL-L-17331, Lubricant No. 2190-TEP or as recommended by compressor
manufacturer. Oil cooler shall be designed for a fouling factor of 0.001
for both sides of exchanger. Pressure lubricate hydrodynamic bearings.
Provide the oil sump with level indicator and drain and fill connections.
a.
Prelubrication pump shall be sized by air compressor manufacturer
for the requirements of the system, but shall meet the following
requirements. Pump shall be positive displacement gear pump
separately mounted with motor on a common base plate with drip lip
and drain.
(1) Performance: Pump shall have separate safety valve bypass
set at [_____] [172 kPa] [25 psi] above peak expected pressure.
(2) Materials shall be hardened steel gears and shaft, cast iron
case, bronze bearings, mechanical seal.
(3) Flexible coupling with shaft guard shall be provided, except
that these items are not required for a close-coupled pump.
(4) Motor shall be NEMA MG 1, Design A, Class B insulation, of
open drip-proof type. Furnish combination type starter for 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.
2.3.8
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NOTE: Polyphase motors shall be selected based 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 Charlie
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 Center (NFESC) home
page http://energy.navy.mil/.
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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 procedure.
SECTION 15213N
Page 21
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