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Document XLDS Guide – Section Four A
Revised September 30, 2019
45
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
with the normal supply pressure of 350 psig. For
the intermediate pressure check, the ICS will
need to be attached to a helmet, mask or to FFM.
For the flow test, the flow meter will be in place
of the helmet, or full face mask.
1. Line up the RDC console with umbilical to one
of the divers circuits, ensuring that the HP air
supply is at least 1000 psig.
2. Attach the umbilical to the ICS inlet, then
attach the intermediate pressure gauge to the
helmet outlet whip, and snug by wrench.
3. Load the RDC regulator to 350 psig, and
bring up pressure to the ICS.
4. The pressure on the ICS pressure gauge,
should read between 155-170 psig. Open and
close the EGS valve a couple times, to check
for a stable lock up pressure.
5. Secure air at the RDC outlet, then bleed down
the umbilical to zero through the ICS/EGS
valve, then secure the EGS valve and bring
pressure back up, and check the intermediate
lock up again. This cycling test helps set the
seat, and distributes the silicone grease
around the spring cavity.
6. If the ICS is intermediate pressure is above
170 psig, remove one shim (9), from under
the piston. If the pressure is below 155 psig,
add one shim (9), between the piston and
spring.
Figure 82
Figure 83
System Flow Test
Preliminary
A flow test is done on the complete ICS, and
umbilical system to ensure system capability. It is
important that the RDC pressure gauges, are
accurate to ensure an accurate test. All RDC LP
gauges, should be cross connected and compared
to with a master gauge, at least once a year or
anytime accuracy is in question.
NOTICE
It is normal for the grease to squirt out, after cycling
a newly overhauled ICS regulator. Wipe off excess
grease.
NOTICE
A maximum of three shims may be used only. If
three shims do not restore, the proper
pressure range the spring (8), should be
replaced. For adding or removing shims, refer
to the disassembly, and reassembly section of
the ICS regulator overhaul.
