2.7.1.1
Air Filter
Air Filter on inlet shall act as a muffler. Provide filter of the [oil
wetted type] [dry type] readily removable for cleaning.
2.7.1.2
Oil Filter
Provide full flow type filter for positive forced feed lubrication
conforming to FS F-F-351.
2.7.1.3
Air Receiver
Receiver shall be [_____] liter cubic feet minimum volume designed in
conformance with FS XX-C-2816 except that working pressure shall be 1724
kPa (gage) 250 psig. Provide the receiver, with a safety valve set for
1792 kPa (gage) 260 psig, a drain valve and an air trap with shutoff valve.
[Provide a stand for mounting the receiver.] Provide a dial gage, not less
than 114 mm 4 1/2 inches diameter, range zero to 2068 kPa (gage) 300 psig,
on the receiver.
2.7.1.4
Electric Motor
Motor shall be [_____] volt, [_____] phase, 60 Hz, totally enclosed, fan
cooled not less than [_____] kW hp, as specified in paragraph entitled
"Motors and Drives." Control circuits for motors shall be nominal 120
volts.
2.7.1.5
Controls
Provide [constant speed] [dual control] regulation and the "optional safety
controls" as specified in Table I of FS XX-C-2816 for the compressor
system. In addition, provide a lead-lag control system with alternating
lead-lag cycles.
2.7.2
Instrument Compressed Air System
Provide air compressor package with two compressors, two electric motors,
one horizontal receiver, and control panel, [mounted on one supporting
steel base with skids] [mounted separately].
2.7.2.1
Air Compressor
Each shall be a single stage, cross head type, vertical, double acting,
water cooled, nonlubricated head type. Compressor shall be specially
designed for non-lubricated service, with a honed cylinder, piston rod
packing, piston rings and piston wear rings. Valve guide inserts and wear
rings shall be TFE. Valves shall be reversible and hardened, with
stainless steel seat plates for nonlubricated service. Provide necessary
sleeves, baffles, and collars to prevent oil carryover. Provide air
operated, piston type, free air unloaders for capacity reduction and
starting. Mount filter-silencer directly on air inlet to cylinder.
a.
Design and Performance: Each compressor shall deliver not less
than [_____] standard L/s scfm of free air at a discharge pressure
of 690 kPa (gage) 100 psig.
2.7.2.2
Air Receiver
Horizontal tank with a volume not less than [_____] liters cubic feet.
SECTION 15501N
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