MIL-C-0052980C(ME)
Intercooler and aftercooler. When a multi-stage
3.19.2
compressor is furnished, an intercooler shall cool the air between
the pressure stages and shall be located so as to be cooled by the
air blast from the fan. A spring-loaded-type pressure-relief valve
shall be installed between the pressure stages to protect the
low-pressure cylinder in case of failure of the high-pressure
cylinder valves.
The temperature measured at the discharge of the
air receiver shall not exceed ambient +100 °F at a pressure of
200 psig.
If necessary to meet the temperature requirements
specified herein, an aftercooler may be provided between the last
stage of the compressor and the air receiver tank. Aftercoolers
shall be air cooled.
All pressure tubing and
3.19.3
Pres sure tubing and fittings.
fittings shall be rated to withstand 1-1/2 times their normal
working pressure.
3.19.4 Drive.
The drive shall consist of V-belt and grooved
Except for the
pulley on the power unit and compressor unit.
winterized compressor (see 3.25.7) , all drive belts shall conform to
A-A-52155. A means for belt removal and adjustment shall be
provided.
3.20
Type II, rotary.
3.20.1 Compressor.
The type II compressor shall deliver the
capacities of free air specified in table 1 at a pressure of
The
175 psig as determined by the ASME Performance Test Code 9.
components of the compressor shall be balanced so that when the
compressor is operating in conjunction with the gasoline engine,
The compressor shall not exceed the
vibration shall be minimized.
contractor's recommended continuous operating speed.
The compressor
unit shall be positive displacement and air-oil cooled.
A means
shall be provided to remove and recover the oil from the discharge
air.
When a filter-type separator is used, it shall be accessible
for examination, cleaning and replacement without removal of other
parts or components.
To prevent hydraulic lock upon starting, a
means shall be provided in the stator assembly to allow accumulated
oil to pass into the sump. A pressure gauge shall be provided
between the compressor unit and the separator discharge to indicate
the pressure in the compressor. A nonreturn valve shall be provided
either in the oil separator or in the discharge from the separator
to prevent reverse flow of air from the receiver.
All pressure tubing and
3.20.2 Pressure tubing fittings.
fittings shall be capable of withstanding 1-1/2 times their normal
working pressure.
3.20.3
The type II compressor shall be either direct
Drive.
drive or V-belt drive.
The V-belt drive shall conform to 3.19.4.
When a direct drive is used, a flexible coupling shall be installed
The mounting base for
between the power unit and compressor unit.
the power unit shall have a means for belt removal and adjustment
when V-belt drive is used.
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