MIL-S-53l20
provides constant depth monitoring of the divers by topside personnel. The SDASS
piping, fittings, valves, gauges, -regulators, connecting high pressure (HP) and
low pressure (LP) hoses, HP flasks and LP tanks shall be designed for working HP
pressure of not less than 5,000 psig and LP pressure of not less than 350 psig.
They shall be of materials as specified in the drawing package: TA13229E4550.
Safety devices shall be provided as specified in the drawing package to protect
the HP and LP compressed air system. The SDASS shall be capable of withstanding a
hydrostatic pressure test of not less than five-thirds of the working pressure
without leaking or damage to the SDASS. The SDASS shall be delivered in a clean
state as specified in 3.12.2 when tested in accordance with 4.5.2.4. The SDASS
shall be constructed in accordance with NCSC5110-AR-001 and all applicable
drawings. The SDASS consists of the following major components:
a. Diver air control console (DACCI. The DACC is a man portable console which
shall be installed on top of the volume tank assembly (VTA) during diving
operations. The DACC shall receive HP air (5,000 psig) from the diver's air
storage system (DASS) or LP air (250 psig) from a 88.5 cfm compressor. HP
air shall enter the DACC through either the primary or secondary circuit,
each consisting of HP shutoff valves, manual adjustable regulator, HP and LP
gauges with isolation valves, and an emergency crossover valve. HP air shall
be reduced to LP air and supplied to the VTA through one of two LP outlet
valves. The LP circuit shall consist of a shutoff valve to control air from
the 88.5 cfm compressor, LP gauge with an isolation valve, and an LP outlet
valve. A bleed off valve shall be supplied for draining air from the DACC.
The DACC shall also have three pneumo-fathometers for constant monitoring of
the diver's depth. The DACC shall be connected to the VTA through a pair of
flexible deck hoses.
b. Volume tank assembly (VTA). The volume tank assembly shall be a man
portable, frame-mounted LP air reservoir with an eight-cubic foot, floodable
volume. Low pressure air shall be received from the DACC through a pair of
flexible deck hoses. The incoming LP air shall enter through the VTA
manifold and pass through a check valve into the LP volume tank. Two flex
whips shall deliver LP air from the LP tank the flip up control panel. The
control panel shall have three diver LP air supply valves, a bleed off valve,
a gauge, and gauge isolation valve. Diver's air shall leave the VTA and
enter the diver's umbilical at the panel's "deep-sea" bulkhead fitting.
c. Diver air storaqe system (DASS). The diver air storage system (DASS) shall
serve as a portable storage bank for high pressure air (5,000 psig). Each
DASS rack shall contain two 1075-cubic-foot (3.15 cubic-foot floodable volume
each) Kevlar-wrapped flasks housed in an aluminum stackable pipe frame. Each
assembly shall consist of four racks. Each end of the rack shall have a
separate control panel with an Wet and an outlet globe valve. In addition,
the charging ends panel shall have a bleed off valve for draining air. The
outlet end's panel shall have gauge and a gauge isolation valve. Four racks
shall be interconnected with the 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
shall be stacked two high and two abreast. Interconnections between
individually stacked racks shall be made outlet to inlet with eight-foot-long
HP deck hose.
d. Chamber reducinq station (CRS). The CRS shall be an air monitoring and
control assembly for the air flow to a recompression chamber. The CRS shall
be a four man portable tubular frame enclosing a control panel and associated
hardware with one HP (5,000 psig) and two LP (250 psig) inlets on the left
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business