TM 5-4220-227-14d. CompressedAirSupplyRequirements. (Ref. FM 20-11-1). A recompression treatment facility must have aprimary 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 165feet and ventilate during one treatment.Secondary -Sufficient air to pressurize the inner and outer locks once and ventilate for one hour at70.4 SCFM.Either system may consist of air banks or a suitable compressor or both. The primary recompression chambersupport system must be capable of pressurizing the inner lock to a depth of 165 feet in three minutes. Therequired total capacity is calculated as follows:(1) Primary system capacity.Cp=5 V11 +10 V01 + 45,390whereCp=Minimum capacity of primary system in standard cubic feet (SCF)V11=Volume of inner lock in cubic feetV01=Volume of outer lock in cubic feet5=Atmosphere equivalent to 165 FSW10=Twice 5 atmospheres45,390=total SCF of air required to ventilate during a treatment, table 4.(2) Secondary system capacity.Cs=5 V 11 + 5 V01 + 4224whereCs=Minimum capacity of secondary system, SCFV11=Volume of inner lockV01=Volume of outer lock5=Atmosphere equivalent to 165 FSW4224=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 whichprovides piping and valves to hook-up six size D 02 cylinders, three of which may be replaced while the other threecontinue to provide uninterrupted service.1-10. Safety, Care, and Handling. When operating or doing maintenance on 3-Person Recompression Chamber, takenecessary precautions to ensure the safety of others as well as yourself. Avoid careless operating or maintenance habitswhich cause accidents to personnel and damage to the equipment. Observe all WARNING's, CAUTION's, and NOTE'sin this manual. This equipment can be extremely dangerous if these instructions are not followed.1-8
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