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The REX
Regulator
®
presented in this manual are intended for use with properly adjusted and maintained
KMDSI
47 and 77 helmets only. None of the KMDSI
®
other makes of hats and should not be used with other manufacturers' helmets or masks.
To properly supply the diver with breathing air, the helmet as well as the umbilical and
associated supply system must be properly configured, maintained, and adjusted.
maximum performance based on the compressors
output. The table allows the user to maximize depth
capability based on respiratory work load and supply
system capability. In physiological terms the work rate
is the amount of gas breathed in a one minute. For
highly fit diver's, the main performance limiting factor
is the inhalation and exhalation effort of the breathing
system. For divers not so fit, the limiting factor may
be their own physical ability. Regardless, all divers
should never push themselves beyond their capability
and the capability of the equipment being used.
For practical purposes, the U.S. Navy defines breath-
ing work rates in terms of "RMV" which stands for
Respiratory Minute Volume." RMV is defined as the
amount of breathing gas that flows in and out of your
lungs in one minute. See Appendix Table 1.
Users should ensure that the compressor or supply
system meets both the supply pressure and output
volume required for the deepest anticipated depth
and ventilation rate. Below is the formula used for
computing the volume of air being used at a given
ventilation rate at depth.
Note: This is the bare minimum. As a safety margin, it
is best to plan on an additional 10%-20% of breathing
gas to ensure the supply system can keep up.
{(Depth + 33) ÷ 33} x RMV} x .10 or .20 safety
margin.
Best Practice:
• When using a LP compressor always base the output
pressure on the lowest pressure during compressor
cycling.
• Complete a flow test of the compressor / air system
and all umbilicals at least once a year and/or whenever
in doubt as to the capability.
• Always take the standby diver into consideration
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
WARNING
Low-Pressure Compressor Supply Pressure Requirements tables
®
WARNING
supply tables have been evaluated on
®
when planning air usage.
• Always allow for at least 10-20% greater volume
than what is needed for the maximum ventilation
anticipated.
• Never use less than 40 RMV for planning purposes.
• Refrain from heavy use of the helmet steady flow
valve. Short 2-3 second bursts will not significantly
affect inhalation performance.
• Always dive with a fully functional man worn emer-
gency gas supply system (EGS) of sufficient capacity
based on the hazards of the task, have the cylinder
valve open and the emergency valve shut.
• When using HP supply systems (Control Consoles)
use the recommended pressures for depth as listed in
the table for High Pressure Regulators Settings found
in this chapter. For best overall performance avoid us-
ing pressures excessively higher than what is required
for depth especially if diving shallow.
DANGER
Decompression diving always involves the
risk of decompression sickness. Omitted
decompression due to a loss of the breath-
ing gas supply or other accidents can cause
serious injury or death. Use of a Kirby Morgan
helmet or mask cannot prevent this type of
injury.
2.7.2 Using the REX
®
Pressure Compressor Supply Pressure
Requirements Table
The REX
LP table is for use when using LP compres-
®
sors only. If you are using an HP reducer console, use
the High Pressure table on page 28 of this manual. The
REX
low pressure table in this manual is intended for
®
the REX
regulator only and should not be used for
®
the other KMDSI regulators or with other manufac-
tures helmets or masks. To use the REX
Low Pressure table, you must know your compressors
output pressure and volume, the divers maximum
planned depth, and the anticipated work rate.
Kirby Morgan
®
Regulator Low-
Regulator
®
77
11
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