not shown on project drawings.
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The drawings show a generalized overall control system for compressor,
auxiliaries, remote panel transmitting and receiving, and remote panel. The
system is shown using relay symbology. Contractor and equipment suppliers
may use standard panel features to accomplish the total requirements using
other methods of signal, solid state devices, or revised lamping. All
wiring diagrams and required devices shall be approved by the Contracting
Officer prior to installation.
]2.3.6
Compressor Design Features
The compressor shall be a multistage, oil-free rotary screw compressor,
with a minimum of two compressor stages, flanged to an integral speed
increaser. Each stage shall be driven from a common bull gear to ensure
optimum speed and efficiency. An intercooler shall be provided between
stages and aftercooler shall be provided after the final stage of
compression. Silencers, lubricating system, cooling system, control
system, and driver shall be mounted as part of the package. Provide a
common base frame for the compressor system and driver. Provide a sound
enclosure over the compressor and driver. Equipment shall be designed for
economical and rapid maintenance. Casing components, bearing housings, and
other major parts shall be shouldered, dowelled, or designed with other
provisions to facilitate accurate alignment or reassembly. Shaft seals and
bearings shall be accessible for inspection or replacement with a minimum
of disassembly; however, compressors with compression elements (air end)
provided as a factory-assembled not repairable in the field may be approved
by the Contracting Officer if determined to be in the interest of the
Government.
2.3.6.1
Casings
Casings shall be cast iron, ductile iron, cast steel, or fabricated steel.
Casing stresses shall be within the limits allowed by ASME BPVC SEC VIII D1.
Casings, supports, and baseplates shall be designed and fabricated to
preclude excessive and injurious distortion from temperatures, pressures,
and forces encountered in service conditions. Provide jackscrews, lifting
lugs, eyebolts, guide dowels, and casing alignment dowels to facilitate
disassembly and reassembly. When using jackscrews for parting contacting
faces, relieve one of the faces by counterboring or recessing to prevent
marring the face, which result in leaking or improper fit. Provide lifting
lugs or eyebolts for removable portions of the casings. Flanged casing
connections for external piping shall conform to ASME B16.1 or ASME B16.5.
Threaded connections for external piping shall conform to ASME B1.20.1.
Air compression portion of the casing shall be one-piece and shall be
provided with integral coolant passages and a large inlet port. Gear cases
shall be enclosed, accessible, force lubricated, and designed with seals
and slingers to keep oil out of air system.
2.3.6.2
Shafts
Shafts shall be of forged or rolled alloy steel and shall have a machined
finish throughout their entire length. All rotating components shall be
positively secured to shafts by approved mechanical means or interference
shrink fits.
SECTION 15215N
Page 18
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