TM 55-2210-224-34
3-42.
AIR COMPRESSOR ASSEMBLY (cont)
TEST (cont)
Table 3-4. Compressor Passing and Condemning Limit
AVLAL TYPE AIR COMPRESSORS
LIMITING PRESSURES vs. SPEED
(SEA LEVEL CONDITIONS)
(DATA IS BASED ON THE FOLLOWING)
NOTES: High-pressure orifice test is calculated using the following conditions:
(1)
0. 250-inch diameter orifice with square edges, bored through 0. 0625-inch thick plate.
(2)
Orifice coefficient 85%.
(3)
Atmospheric pressure 14. 7 (for higher altitudes, deduct 1% from pressures for each 260 feet above sea
level)
(3)
Atmospheric pressure 14. 7 (for higher altitudes, deduct IT from pressures for each 260 feet above sea
level.)
(4)
Compressor displacement 103. 5 cfm at 980 rpm.
(5)
Volumetric efficiency 70% for new unit.
(6)
Condemning limit 80% of new unit.
3-173