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© ⅯⅯⅩⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 120613005
3.8.6 Testing the Breathing System
Test the defogger system by turning on and off the
defogger control knob. The regulator should be ad-
justed by turning the adjustment knob out until a slight
steady flow starts, then back in until the flow just stops.
Next, the demand regulator system is checked for
proper function: breathe in and out. Inhalation and
exhalation effort should be nearly unnoticeable. Press
in on the purge button in the regulator cover. This
should produce a strong burst of breathing gas.
Do not perform this test unless the diver
and their tender are stationed immedi-
ately adjacent to the diver’s air manifold
and you are certain the air is on to the
manifold. If the diver is unable to flow air
to the helmet, either through the umbili-
cal or the bailout, they may not be able
to remove the helmet easily.
To break the seal in this situation, the
diver must put their hand between the
neck dam and the neck, and pull the neck
dam away from the neck. A tender must
be standing by to assist the diver in re-
moving the helmet if needed. Suffocation
could result.
WARNING
3.8.7 Sealing Integrity Check
If there is any doubt that the helmet is sealing prop-
erly, perform the following test prior to diving.
Turn the supply gas off at the dive control system and
bleed the umbilical.
To perform this test, the diver must have an assistant
standing by. The assistant should be in control of the
gas supply console in the event the diver needs air or
they must be ready to lend a hand. The diver must be
next to the dive control manifold so that the air may
be turned on instantly, or the diver must be ready to
run a hand between their neck and the sealing neck
dam in order to pull the neck dam away from the neck
to allow breathing.
With the neck dam and yoke on the diver’s neck, the
helmet is installed and the yoke is closed. When the
diver attempts to inhale, a suction on the neck dam
is formed, indicating they are achieving a good seal.
The diver must then turn the air on immediately so
that they can breathe. If the diver does not turn the
air on they will not be able to breathe, unless the neck
dam is pulled away from their neck.
The diver must be satisfied that their helmet is work-
ing properly before they enter the water.