TM 5-4220-227-14
d. Compressed Air Supply Requirements. (Ref. FM 20-11-1). A recompression treatment facility must have a
primary and a secondary air supply system which satisfy the following requirements.
Primary
-
Sufficient air to pressurize the inner lock once to 165 feet and the outer lock twice to 165
feet and ventilate during one treatment.
Secondary -
Sufficient air to pressurize the inner and outer locks once and ventilate for one hour at
70.4 SCFM.
Either system may consist of air banks or a suitable compressor or both. The primary recompression chamber
support system must be capable of pressurizing the inner lock to a depth of 165 feet in three minutes. The
required total capacity is calculated as follows:
(1) Primary system capacity.
Cp
=
5 V11 +10 V01 + 45,390
where
Cp
=
Minimum capacity of primary system in standard cubic feet (SCF)
V11
=
Volume of inner lock in cubic feet
V01
=
Volume of outer lock in cubic feet
5
=
Atmosphere equivalent to 165 FSW
10
=
Twice 5 atmospheres
45,390
=
total SCF of air required to ventilate during a treatment, table 4.
(2) Secondary system capacity.
Cs
=
5 V 11 + 5 V01 + 4224
where
Cs
=
Minimum capacity of secondary system, SCF
V11
=
Volume of inner lock
V01
=
Volume of outer lock
5
=
Atmosphere equivalent to 165 FSW
4224
=
Air required for maximum ventilation rate of 70.4 SCFM for 1 hour.
e. Oxygen (02) Requirements. Oxygen is supplied to the recompression chamber by the 02 supply manifold which
provides piping and valves to hook-up six size D 02 cylinders, three of which may be replaced while the other three
continue to provide uninterrupted service.
1-10. Safety, Care, and Handling. When operating or doing maintenance on 3-Person Recompression Chamber, take
necessary precautions to ensure the safety of others as well as yourself. Avoid careless operating or maintenance habits
which cause accidents to personnel and damage to the equipment. Observe all WARNING's, CAUTION's, and NOTE's
in this manual. This equipment can be extremely dangerous if these instructions are not followed.
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