MIL-DTL-52031E
112.
Safety pin not as specified.
3.6.4
113.
Swivel arm not as specified.
3.6.5
114.
Grip not as specified.
3.6.6
115.
Discharge orifice bushing and horn not as specified.
3.6.7
116.
Bracket not as specified.
3.12
117.
Instructions and nameplate not as specified.
3.13
118.
Weight not stamped on nameplate.
3.13
Minor
201.
Identification marking not as specified.
3.14
202.
Treatment and painting not as specified.
3.15
203.
Workmanship not at specified.
3.16
4.4.2 Tests.
4.4.2.1 Seal torque. The extinguisher shall be secured in an upright position. 25 foot-pounds ± 1 foot-
pound of torque shall be applied to the cylinder seal using a torque wrench. This test can be conducted
at the time of assembly. Movement or tightening of the cylinder seal during this application shall
constitute failure of this test.
4.4.2.2 Leaks. A fully charged extinguisher shall be tested for leaks using a detector, which shall detect a
leakage rate as low as 0.1 ounce or less per year. Any detection of leakage shall constitute failure of this
test. The detector to be used shall be calibrated with a known value of gas prior to performing the test
specified herein.
4.4.2.3 Vibration. The fully-charged extinguisher shall be mounted in its bracket and undergo vibration
testing in both a horizontal and vertical position. The mounted extinguisher shall be subjected to
vibrations in the vertical direction at the rate of 60 cps at 1¼ g acceleration for a period of one hour for
each position. Breaking or loosening of components, inability of the bracket to hold, inability of the swivel
arm to swivel as specified in 3.6.5, or discharge of the extinguisher in less than 8 seconds or more than
12 seconds, shall constitute failure of this test.
4.4.2.4 Seal disk burst pressure. The seal disk assembly shall be inserted into a hydraulic test rig.
Hydrostatic pressure shall be applied slowly until the disk bursts. A burst pressure of less than 950 psig
or greater than 1150 psig shall constitute failure of this test.
4.4.2.5 Drop and discharge. The fully-charged extinguisher shall be dropped with the head assembly
from a height of four feet onto a solid, concrete surface from each of the following positions:
(a) Longitudinal axis parallel to the concrete surface.
(b) Extinguisher bottom down.
(c) Extinguisher head down.
A leak detector shall determine whether the extinguisher is leaking. The head assemble shall be rotated.
The extinguisher shall be discharged completely. Any leakage, discharge, of the extinguishing agent in
less than 8 seconds or more than 12 seconds, discharge range of less than four feet, or inability of the
head assembly to rotate 360° shall constitute failure of this test.
4.4.2.6 Performance. The fully-charged extinguisher shall be weighed. The weight of the fully charged
extinguisher extinguishing agent shall be between 2 pounds, 11 ounces, and 2 pounds, 14 ounces.
Weight shall be determined at laboratory atmospheric conditions in accordance with ASTM E171. The
extinguisher shall be cooled to a temperature of -50° F ± 2° F and the temperature shall be maintained for
not less than 12 hours. At the conclusion of this period, the extinguisher shall be immediately discharged
completely. Any leakage, discharge of the extinguishing agent in less than 8 seconds or more than 12
seconds, discharge range of less than four feet, or inability of the head assembly to rotate 360° shall
constitute failure of this test.
9
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