TM 5-4220-231-14&P 1) Diver  Air  Control   Console (DACC). The DACC  is   a   two-man portable    console which    is   installed   on top of    the Volume Tank Assembly (VTA)    for    operations. The dimensions are 29 in.   x    32 in.   x    14    in.,    and the console weighs approximately 160 pounds. The DACC receives HP air    (5000 psig) from the Diver    Air   Storage System (DASS) or LP    air    (250 psig) from a   88.5 cfm   compressor. HP air    enters the DACC through either the primary or   secondary circuit, each consisting of   HP   shutoff valves, manual adjustable regulator, HP   and LP   gages with    isolation valves, and an    emergency crossover valve. HP    air   is   reduced to   LP   and supplied to   the    VTA   through one of   two LP   outlet valves. The LIP circuit consists of   a   shutoff valve to   control air   from the 88.5    cfm    compressor, LIP gage with    an isolation valve, and an LP  outlet valve. A   bleed valve is   supplied for   draining air  from    the DAM The DACC also has three pneumo-fathometers for constant monitoring of the divers' depth. The DACC is connected to   the VTA   through a   pair of  flexible deck hoses. 2) Volume Tank Assembly (VTA). The volume tank assembly is   a   four-man portable, frame-mounted reservoir with   an    eight-cubic-foot, floodable volume. The dimensions are 62   in.  x   29   in.  x   33   in.   and the   total   weightm of   the assembly is   approximately 425 pounds. Low   pressure air    is   received from the Diver Air   Control Console (DACC) through a    pair    of   flexible deck hoses. The incoming air    enters through the VTA    manifold and passes through a   check valve into   the volume tank. Two flex   whips deliver air   from    the tank to   the flip-up control panel. The control panel has three diver air    supply valves, a    bleed valve, a   gage, and gage isolation valve. Diver's air leaves the VTA   and enters the umbilical at   the panel's "Deep-Sea" bulkhead fittings. 3) Diver   Air  Storage System (DASS). The Diver   Air  Storage System (DASS) serves as    a   portable storage bank for    high pressure (5000 psig) air. Each rack contains two 1075 cubic-foot (3.15 cubic-foot floodable, volume each) Kevlar-wrapped flasks housed in   an    aluminum stackable pipe    frame. Each assembly consists of  four    racks, The dimensions are 74 in.   x   45 in.   x  27 in.   and the total charged weight of   each individual rack is   approximately 520 pounds (2080 pounds per    assembly). Each end of  the rack has a   separate control panel with    an    inlet    and an outlet globe valve. The charging end's panel has, in   addition, a   bleed valve for   draining air. The outlet end's panel has a   gage and a   gage isolation valve. Four racks are interconnected with   the Diver    Air   Control Console (DACC) for    dive operations, while four additional racks are interconnected with the Chamber Reducing Station (CRS) to support Recompression Chamber operations. Each assembly of  four racks is   stacked two high    and two    abreast. Interconnections between individually stacked racks are made outlet to   inlet    with    eight-foot HP    deck hose. 4) Chamber Reducing Station (CRS). The CRS is   an    air   monitoring and control assembly for  the air  flow to recompression chamber. The CRS is    a portable tubular frame enclosing a    control panel and associated hardware with   one HP   (5000 psig) and two    LP   (250 psig) inlets    on   the left   side, and two    LP   (40   to   350 psig) outlets on the right side. The control panel consists of    primary and secondary HP shutoff valves, a    manual adjust regulator, two LP   inlet    stopcheck valves, HP    and LP   gages with    isolation valves, LP   outlet valve, and bleed valve. The CRS measures 35 in.   x   33 in.   x    17   in.   deep, and weighs approximately 225 pounds. The CRS receives HP air    from    the DASS and receives LP   air    from    two    88.5 cfm   compressors. Primary HP    control circuit consists of   a shutoff valve and a   manual adjust regulator to   control a   dome regulator's discharge (40 to   350 psi),    and is   capable of    pressurizing a    231-cubic-foot chamber (inner and outer lock) to 165 fsw (73.4 psi) in    under three minutes. Secondary HIP   control circuit consists of a shutoff valve and a manual adjust regulator, and continues recompression at   a   reduced flow    rate. The LP   control circuit consists of   two   valves to   control air   from one or   two air   compressors, and is   capable of   pressurizing the inner lock   of   a   231-cubic-foot chamber in  under three minutes. All   air   supplies feed a   manifold and are controlled by   an    LP   outlet valve to   bulkhead fittings. The    CRS is  connected to   the chamber by   two 10-foot, LP   hoses. 5) Deck and Interconnecting Hoses. HP    deck hoses are used to   connect the HP    compressor to   the DASS, and the DASS to   the DACC    or   CRS. HIP  hoses are also used to   interconnect flask racks. LP   deck hoses are used to   connect the LP   compressors to  the DACC and CRS, and the DACC to   the    volume tank. LP   deck hoses are also used to   connect the CRS to   the recompression chamber. 1-5