TM 1-1520-238-23
Change 7
12-102.1
12.33.
FIRE EXTINGUISHING SYSTEM INSPECTION - continued
(1) Rapidly move each check valve from side to
side to insure unrestricted movement of the
check valve ball. No restriction allowed.
(2) Visually inspect the check valve ball for pit-
ting. None allowed.
(3) Using a 10X magnifying glass, inspect the
threads for cracks. None allowed.
(4) Visually inspect interior surface of the valve
for corrosion and evidence of evaporation.
None allowed.
(5) Visually inspect interior surfaces for pitting,
including the ball seats. None allowed.
g. Check agent container for dents, cracks,
scratches, or gouges. None allowed.
h. Visually inspect the inside of the fire bottle
cartridge housing for pitting, corrosion and
evaporation. None allowed.
i. Visually inspect the verticle outlet ports for
pitting, corrosion and evaporation. None al-
lowed.
j. Check discharge cartridge for cracks, nicks,
scratches, and stripped or damaged threads.
None allowed.
k. Check tubes for cracks. None allowed.
l. Check tubes for dents that exceed 20 percent
of tube diameter. None allowed.
m. Check tubes for nicks that exceed 10 percent
of tube wall thickness. None allowed.
n. Check tubes for chafing conditions. None al-
lowed.
o. Check tubes for wear that exceeds 0.020
INCH. None allowed.
p. Check wires for cuts, nicks, fraying, or chaf-
ing (TM 55-1500-323-24).
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M04-3637-1A
