OO-D-2855
3.16 Air compressor. The air compressor shall be a rotary screw type. The
compressor shall be capable of compressing and delivering not less than 185
cubic feet per minute (87 liters per second (L/s)) of free air at a receiver
pressure of 100 psi (689 kPa) at not more than 2,200 rpm under the following
atmospheric conditions:
a.
Sea level.
b.
60 degrees Fahrenheit (°F) (16 degrees Celsius (°C)).
Zero humidity.
c.
Under the conditions specified, the air discharge temperature shall not exceed
250°F (121°C). The compressor shall be capable of operating satisfactorily when
tilted 18° longitudinally or transversely from a level position.
3.16.1 Safety shutdown. The compressor shall be equipped with a safety
shutdown system designed to automatically stop the engine when discharge air
temperature exceeds the safe limit established by the manufacturer, but in no
case exceeding 250°F (121°C).
3.16.2 Filtration. The compressor intake system shall be equipped with dry
type replaceable filtration elements.
3.17 Engine. The rock drill shall be diesel engine powered. The engine
shall power the air compressor and hydraulic pump. The engine shall be two
stroke or four stroke cycle, liquid cooled or air cooled, the engine furnished
shall have the horsepower, torque and speed necessary to meet all performance
requirements of the rock drill, without exceeding the continuous horsepower
values at which the engine is rated. The engine shall be furnished complete
with the following:
a.
A battery charging alternator.
A two stage, dry type, intake air cleaner with service indicator.
b.
Hood and side doors.
c.
An electrical cranking system.
d.
70 gallon (265 L) (nominal) capacity fuel tank with indicator, or
e.
sufficient capacity to operate 10 hours.
Instruments and gages specified in 3.17.1 shall be of the type recommended by
the manufacturer. All engine accessories supplied commercially as standard
equipment shall be furnished. The diesel engine shall be capable of starting
within 5 minutes and shall be ready for full load operation within 15 minutes
under any of the environmental conditions specified in 3.16. The diesel engine
shall start in any temperature above -20°F (-29°C). Starting aids may be either
electric glow plug or ether primer. When an ether priming system is furnished,
it shall be the measured shot type, with storage capacity of not less than 12
fluid ounces (355 milliliter (mL)).
3.17.1 Instruments and controls. The following engine instruments and
controls, as a minimum, shall be furnished:
Control, starter.
a.
b.
Control, shutoff.
Control, throttle.
c.
d.
Gage, lubricating oil pressure.
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