CHAPTER 22 Recompression Chamber Operation
Change A 22-25
Recompression Chamber Paint Process Instruction. Painting shall be kept to an
absolute minimum. Only the coats prescribed above are to be applied. Naval Sea
Systems Command will issue a Recompression Chamber Paint Process Instruction
(NAVSEA-00C3-PI-001) on request.
Aluminum Chambers. Only steel chambers are painted. Aluminum chambers are
normally a dull, uneven gray color and corrosion can be easily recognized.
Aluminum chambers will not be painted.
Fire Hazard Prevention. The greatest single hazard in the use of a recompression
chamber is from explosive fire. Fire may spread two to six times faster in a pres-
surized chamber than at atmospheric conditions because of the high partial
pressure of oxygen in the chamber atmosphere. The following precautions shall be
taken to minimize fire hazard:
Maintain the chamber oxygen percentage as close to 21 percent as possible
and never allow oxygen percentage to exceed 25 percent.
Remove any fittings or equipment that do not conform with the standard
requirements for the electrical system or that are made of flammable materials.
Permit no wooden deck gratings, benches, or shelving in the chamber.
Use only mattresses designed for hyperbaric chambers. Use Durett Product or
submarine mattress (NSN 7210-00-275-5878 or 5874). Other mattresses may
cause atmospheric contamination. Mattresses should be enclosed in flame-
proof covers. Use 100% cotton sheets and pillow cases. Put no more bedding
in a chamber than is necessary for the comfort of the patient. Never use blan-
kets of wool or synthetic fibers because of the possibility of sparks from static
Clothing worn by chamber occupants shall be made of 100% cotton. Diver
swim trunks made of 65% polyester 35% cotton material is acceptable.
Keep oil and volatile materials out of the chamber. If any have been used,
ensure that the chamber is thoroughly ventilated before pressurization. Do not
put oil on or in any fittings or high-pressure line. If oil is spilled in the cham-
ber or soaked into any chamber surface or equipment, it must be completely
removed. If lubricants are required, use only those approved and listed in
Naval Ships Technical Manual (NSTM) NAVSEA S9086-H7-STM-000,
Chapter 262. Regularly inspect and clean air filters and accumulators in the air
supply lines to protect against the introduction of oil or other vapors into the
chamber. Permit no one to wear oily clothing into the chamber.