MIL-HDBK-1027/1B
3.12.4.6 Breathing Air. Two types of breathing apparatus are
used in the 21C12 and 21C12A structures, the OBA and EAB
devices. The OBA canisters for this structure should be racked
in accordance with Appendix G, Figure G-5. There should be two
such racks in each staging area for a ready storage of 44 OBA
canisters per team. The OBA headpiece should be stored in
lockers constructed in accordance with Appendix G, Figure G-7.
There should be 10 OBA lockers in each staging area. The EAB
outlet housings should be constructed in accordance with Mare
Island Dwgs. 612-1889964A1 and 612-1889964A2, see Appendix G,
Figure G-11. Housings should have doors. There should be eight
EAB outlet housings, four in the fireplace compartment, two in
the emergency corridor, and one in each of two staging areas.
Caution: Care must be taken during design and
construction of the breathing air system to eliminate
any possibility of the air in the EAB system rising in
temperature such that it would be hazardous to health.
The EAB system piping should not be routed in the
fireplace compartment.
a) Store EAB head gear in a cabinet in accordance
with Appendix G, Figure G-6. Two cabinets must be located in
each staging area and two cabinets must be located in the
fireplace compartment.
b) The EAB system must be in accordance with the
schematic shown on LANTDIV Sketch No. SK-M-43-86. The EAB
system must be a 689 kPa system. Naval Facilities Guide
Specification (NFGS) 15484, Medical Gas and Vacuum Systems, on
nonflammable medical gas systems can be used; however, modify
the guide specification to suit requirements of this 21C12 and
21C12A criteria.
c) The EAB system should meet: (1) Fed. Spec.
BB-A-1034, Source II and (2) 29 CFR 1910, OSHA Safety and Health
Standards for General Industry Grade D breathing air
requirements. Delete reference to Table II. The EAB compressor
should be an oil-free, breathing air compressor: single-stage,
positive displacement, non-pulsating, and liquid ring type, Nash
Engineering Company, Model OC-5C or equal. To meet breathing
requirements, the EAB system may require use of a refrigerated
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