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© Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document #080626002
Kirby Morgan 77
Connecting the umbilical to the helmet.
Connecting the waterproof connectors.
3.8 Setting Up to Dive
3.8.1 Flushing Out the Umbilical
Before connecting the umbilical to the helmet, the
umbilical must be flushed out to remove any dirt,
moisture, or other debris. Connect the topside umbili-
cal end to the topside diver control console. Ensure
there is no pressure in the divers umbilical.
Carefully uncap the helmet end of the umbilical and
hold securely while pointing in a safe direction, then
slowly bring up gas pressure to approximately 25-40
p.s.i.g. (1.7-2.7 bar). Allow the gas to flow for at least
15 seconds. If it is not going to be used immediately,
the umbilical should be recapped.
If the one way valve or the adapter is loos-
ened this will allow breathing gas to leak
out of the breathing system. This could
also result in a loss of all pressure to the
helmet, leaving the diver with nothing to
breathe.
3.8.2 Connecting the Umbilical to
the Helmet
When you connect the hose to the helmet be sure to
use a wrench to hold the adapter, or inlet fitting, and
a second wrench to turn the swivel fitting on the hose.
If this is not done, the adapter will turn inside the one
way valve. If this happens repeatedly the threads will
wear and the valve will need to be replaced.
The connection between the hose and the helmet must
only be made up “snug”. Excessive force will deform
and ruin the adapter. A second wrench must be used
when the helmet is disconnected as well, otherwise
the adapter and/or the one way valve assembly may
become loose and fail to make a seal.
If you are using waterproof connectors for your com-
munications, take extra care in handling these pieces.
To connect the male and female parts, align the large
pin on the male connector with the yellow mark on
the female connector. Press the two connectors to-
gether until you hear a distinct “pop”. Do not twist
the connectors. Tape the two connectors with a bit of
electrical tape to prevent them from pulling apart.
To separate the connectors remove the tape, grasp
them at the thickest part, place your thumbs against
each other, and push apart until the connectors are
disconnected.
Do not twist the connectors. Do not pull them apart
by pulling on the thin part of the wires.
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