2.1.2.2
Reciprocating Compressors
Provide with forced-feed lubrication, crankcase heater, hot-gas
muffler and
suction strainer. Cylinder unloading devices shall be unloaded
when
compressor starts. Piston speed for open compressors shall not
exceed
recommendations of manufacturer or 5.1 m/s 1000 feet per minute
(fpm),
whichever is less.
2.1.2.3
Helical Rotary Compressors
Positive displacement, oil injected type, and driven by an electric motor.
Rotors shall be solid steel, Society of Automotive Engineers Grade 1141 or
1144. Shaft main bearings shall be either sleeve-design type with leaded
bronze or steel-backed babbit; or frictionless bearing design, ball or
roller type. Housings and covers shall be high-grade cast-iron pressure
castings. Lubrication systems shall lubricate rotors, bearings, shaft seal
as well as rotor sealing and cooling. Provide an oil safety cutout
interlocked with the compressor starter to allow compressor to operate only
when oil management system is operational. Provide for lubrication of
bearings and shaft seals on shutdown with or without electric power supply.
2.1.2.4
Scroll Compressors
Three-dimensional, compliant, hermetically sealed design. Compressors
shall be mounted on vibration isolators. Rotating parts shall be factory
balanced. Main bearings shall be rolling-element type. Lubrication
systems shall be centrifugal pump type including oil level sight glass and
oil charging valve.
2.1.2.5
Condenser Coils
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NOTE: Research project location conditions to
determine the environmental effects on finned tube
coils. The research should include a survey of
existing similar equipment. Prepare project
specifications based on the conclusions of the
research. Consideration should be given to the
following combinations based on past experience of
these materials in dealing with the local conditions.
1.
Copper tube and aluminum fins, coated
2.
Copper tube and copper fins, coated
3.
Aluminum tube and aluminum fins, coated
4.
Aluminum tube and aluminum fins, uncoated
5.
Copper tube and copper fins, uncoated
6. Copper tube and aluminum fins, uncoated.
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Extended-surface fin-and-tube type. Condenser coils shall be constructed
of [copper tubes and aluminum fins] [copper tubes and copper fins]
[aluminum tubes and aluminum fins]. Fins shall be hydraulically or
mechanically bonded to tubes and installed in a metal casing. Coils shall
SECTION 15601N
Page 16
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