TM 55-1930-209-14&P-19
Table 17-4. Preventive Maintenance Checks and Services
for Workboat, Lifesaving, and Firefighting System (Continued)
B -
Before
D -
Daily
Q - Quarterly
D -
During
W -
Weekly
S - Semiannually
A -
After
M -
Monthly
A - Annually
INTERVAL
ITEM
PROCEDURES
EQUIPMENT
ITEM
TO BE
CHECK FOR AND HAVE
IS NOT READY/
NO.
INSPECTED
REPAIRED OR ADJUSTED
AVAILABLE IF
B D A D W M Q S A
AS NECESSARY
·
p Test for air leaks between the cylinder
Leaks exist
and the regulator outlet by observing
between cylinder
changes in gauge pressure. First, open
and regulator out-
both cylinder and main-line regulator
let.
valves and note the indicated regulator
pressure (blocking the breathing tube
outlet on pressure demand units).
·
q. After observing the regulator pressure,
ilndicator drops
close the cylinder valve and watch the
more than 100
regulator pressure gauge. If the indicator
psig in 30 sec-
drops more than 100 psig in 30 seconds,
onds.
leaks are present. They may be located
by applying soapy water to connections
and couplings. Expanding bubbles indi-
cate leaks. Close mainline valve to con-
serve air supply.
r. Check the Audi-Larm Function by
Alarm inoperable.
observing the regulator gauge pressure
at which the alarm rings. This test should
be performed with a minimum cylinder
pressure of 1200 psig.
1) To check a pressure demand appara-
Alarm sounds.
tus, pressurize the system by opening
the cylinder valve for a moment, then
close it. Place your hand or the rubber
protective cover over the regulator
outlet to block it leak-tight. Open the
mainline valve. The alarm should NOT
ring.
2) Slowly remove your hand or the rub-
ber protective cover from the regula-
tor outlet and observe the drop in
pressure on the regulator gauge and
the point at which the Audi-Larm
begins to ring (Table 3-5). The ringing
will continue until air in the system is
exhausted.
17-32
