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CHAPTER 5
May/12
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SERVICE MANUAL
CHAPTER 5
Page 514
Feb/11
283
SERVICE MANUAL
ISO 9650
4.4 Working pressure test
NOTE:
The arch tube is mounted on the upper buoyancy tube.
These will be fully inflated when the upper buoyancy
tube is tested. Therefore they will be checked with the
upper buoyancy tube. Each compartment will be tested
over a period of 60 minutes.
4.4.1 For each inflatable compartment defined in this chapter section 4,
carry out a working pressure test as follows, (FIGURE 503):
(a) Ensure caps on both relief valves are removed.
(b) Inflate the compartments to between values shown below.
Record the temperature and barometric pressure.
(i) THROWOVER; Inflate the compartments to between 1970
and 2250 mm water gauge.
(c) Disconnect the air supply and connect the manometer (FIGURE
501).
(d) Make sure there are no leaks at the test equipment
connections. Use a brush to apply a solution of soapy water, if
necessary, to carry out a test at each joint.
(e) Leave pressurized compartments to settle undisturbed for 30
minutes. Note the pressure, provided the pressure is not less
than:
(i) THROWOVER; 2.8 Psi / 1970 mm WG.
(f) Leave the pressure in the compartments for an additional 60
minutes, (FIGURE 503).
If the inflation pressure, corrected for temperature and baromet-
ric changes, decreases by more than 5% of the noted pressure,
the liferaft fails this test.
(g) If the pressure decrease is more than 5%, look for leaks and
porous fabric. If possible, repair the liferaft within the limits
given, refer to Chapter 6.
