MIL-DTL-45334E
3.4 Performance. Compressor assemblies, governors, and air cleaners shall conform to
the following performance requirements, as applicable:
Compressors
- 3.4.1 and 3.4.4
Governors
- 3.4.2 and 3.4.4
Air cleaners
- 3.4.3 and 3.4.4
3.4.1 Compressor performance.
3.4.1.1 Power input. Power input to the compressor under designated load and speed
conditions, shall not exceed that specified in table I, or the applicable drawing or figure (see 3.3
and 4.5.3.1).
TABLE I. Maximum horsepower input.
Types
Types
Type
Types
Type
Load
Speed rpm I & III
II & IV
V
VI & VII
VIII
At 100 psig 1/
2400
3.4
4.75
7.0
4.3
6.4
Unloaded
2400
1.5
2.25
2.75
1.3
1.4
1/ psig = pounds per square inch gauge.
3.4.1.2 Oil flow. Oil flow at 1775-1825 rpm, and 37.5 psig (258 kPa), shall not exceed
650 cubic centimeters per minute (cm3/min) for types I and III compressors, 1000 cm3/min for
types II, IV and V compressors, and 440 cm3/min for types VI, VII and VIII compressors
(see 4.5.3.2).
3.4.1.3 Discharge air temperature. Discharge air temperature, measured at the
compressor discharge fittings, shall not exceed the inlet air temperature by more than that
specified in table II (see 4.5.3.3).
TABLE II. Discharge air temperature.
Maximum discharge air temperature above the intake air temperature, °F (°C)
Speed
rpm
Types I, III, VI and VII
Types II, IV, V and VIII
600
150 (65.5)
195 (90.5)
1200
235 (112.7)
295 (146)
1800
305 (151.6)
375 (190.5)
2400
350 (176.6)
435 (224)
3.4.1.4 Life. Compressor shall withstand 1000 hours of operation with load conditions,
in alternate 24 hour periods, at no-load and 100 psig (690 kPa). The rate of oil consumption
during any 100 hour period shall not exceed 5 cm3 /hr for types I, II, III and IV, 10 cm3 /hr for
type V, 16 cm3 /hr for types VI and VII, and 20 cm3 /hr for type VIII. Bearing wear or burnout,
oil or air leakage, or distorted parts, considered detrimental to the continued operation of the
compressor, shall be cause for discontinue of the life test (see 4.5.3.4).
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