Construction Specifications; General Description; Gas Flow Systems - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

The diving control station can be at the surface, in
a diving bell, or out of a submerged habitat. The
diving control station is the center of the air/gas
supply, communications with the diver, and div-
ing procedures.
DANGER: Decompression diving
always involves the risk of decompres-
sion sickness. Omitted decompression
due to loss of gas supply or other acci-
dents can cause serious injury or death.
Use of a KMB 18/28 mask cannot prevent
this type of injury.
WARNING: High pressure regula-
tors for surface supplied diving with the
Kirby Morgan Band Mask 18A/B and KMB
28 mask must be capable of supplying an
over bottom pressure of between 115 and
225 PSI. The use of standard SCUBA style
regulators stationed top side is unac-
ceptable as there is no provision for ad-
justing the intermediate pressure sup-
plied to the diver. This can create a dan-
gerous situation where the diver may not
receive an adequate supply of air. Only
regulators which allow a variable setting
for intermediate pressure should be used
for umbilical diving.
The surface supplied diver's mask must provide
life support breathing systems, communications
components, viewing lens, and many other less
important, but vital systems. The Kirby Morgan
Band Masks 18A/B and 28 provides these sys-
tems in a convenient and comfortable way.

1.4 CONSTRUCTION SPECIFICATIONS

KIRBY MORGAN BAND MASK
KMB 18A/B & 28
Weight: 11 pounds
Document # 010518001 © Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved.
KMB 18 & 28 MANUAL
CONSTRUCTION:
Mask Frame KMB 18A/B, Fiberglass
Mask Frame KMB 28, Xenoy/Polycarbonate mix
HARDWARE:
Stainless Steel, Chromed Brass, Polished Brass
CONTROL KNOBS: ABS Plastic
LENS: Polycarbonate plastic
O-RINGS: Buna-N
HOOD: Foam, Open Cell Neoprene
RECOMMENDED LUBRICANTS:
Dow Corning #55 O-ring silicone lubricant.
Krytox, and Crysto Lube are also acceptable.
OPERATING PRESSURE: 115-225 PSI over
ambient.
Optimum 150 PSI over ambient
FLOW REQUIREMENTS: 3.2 CFM
COMMUNICATIONS:
Earphones - Mylar Cone 8 OHM
Oral Nasal Microphone - 8 OHM

1.5 GENERAL DESCRIPTION

1.5.1 Gas Flow Systems

The main gas supply flow from the umbilical
enters the system at the adapter (105) and flows
through the automatic one-way valve (104) to the
interior of the side block assembly (120a/b). The
one-way valve (104) or "non-return" is a very
important component. It must prevent the flow of
gas out of the mask to the umbilical in the event
of a sudden lowering of pressure in the supply
hose. This can happen due to an accidental break
in the hose or a fitting near the surface. Not only
would the auxiliary gas be lost if the one way
valve failed (concurrent with a hose or fitting
break on deck), but the diver would be "squeezed",
a very serious accident. Although we have se-
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