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accomplishment of the endurance test. Record the data as specified in 4.6.2.4 at
30-minute intenals. Failure to start and operate at rated capacity, pressure and
speed, or requirement for replacement of parts shall constitute failure of this
test.
4 . 6 . 2 . 7 C y c l i n g . Start the compressor and allow the receiver pressure to build
up until the pressure-regulation control operates. Then reduce the receiver
pressure until the pressure-regulation control activates to increase the pressure
Vary the pressure as above until a total of 20 high-pressure actuations and 20
low-pressure actuations have been reached. Inability of the pressure-regulation
control to control the pressure as specified shall constitute failure of this
test .
4.6.2.8
Pressure
regulation.
When an adjustable pressure-regulating valve of
the pressure-relief type actuated by receiver pressure is used at the beginning
and after completion of the endurance test, start the compressor and allow the
receiver pressure to build up to determine pressure required to discharge full
capacity through the pressure-regulating valve. Then reduce the receiver
pressure to determine the pressure at which the pressure-regulating valve reseats
Inability to meet the requirements specified in 3.20.4 shall constitute failure of
this test.
4.6.2.9
Class
3.
4 . 6 . 2 . 9 . 1 C a s t e r s . Push and pull the compressor horizontally in all
d i r e c t i o n s , t u r n the compressor 360 degrees, a n d t i l t t h e c o m p r e s s o r 1 5 d e g r e e s
from the horizontal in all directions. Overturning or any condition that
interferes with the maneuverability of the compressor or physical damage to the
compressor shall constitute failure of this test.
4.6.2.10 Tilted operation
Tilt the compressor 15 degrees from the horizontal
a b o u t t h e l o n g i t u d i n a l a x i s a n d o p e r a t e i n t h i s p o s i t i o n f o r 3 0 m i n u t e s . This
test shall be performed in each of the four directions (compressor tilted with
r e s p e c t t o l o n g i t u d i n a l a n d t r a n s v e r s e a x e s ) . A l l o w the compressor to stand for 4
hours in the tilted position most likely to adversely affect the lubrication then
s t a r t a n d o p e r a t e t h e c o m p r e s s o r f o r 3 0 m i n u t e s i n t h a t p o s i t i o n . A n y malfunction
due to tilted operation such as lack of lubrication, rough or erratic operation,
or permanent deformation of any part or component shall constitute failure of this
test.
4.6.2.11
Class 4
4.6.2.11.1
Tiedown porvisions test
The tiedown provisions shall be tested in
accordance with MIL-STD-209 to prove rmance to 3.19.2.1. Inability to meet
the requirements of 3.19.2.1 shall constitute failure of this test.
4 6 . 2 . 1 1 . 2 S l i n g i n g p r o v i s i o n s t e s t The slinging provisions shall be tested
i n accordance with MIL-STD-209 to prove conformance to 3.19.2.2. I n a b i l i t y t o
meet the requirements of 3.19.2.2 shall constitute failure of this test.
Test each compressor for capacity in accordance with
4.6.2.12 C a p a c i t y
4.6.2.3 except that each compressor shall be tested as a unit driven by its
electric motor. P r i o r t o t e s t i n g , run-in each compressor as prescribed by the
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