California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 26 - Driving and Pressurized Worksite Operations
Article 154 - Pressurized Worksite Operations
Section 6095 - Special Decompression Chamber

(a) General. A special decompression chamber of sufficient size to accommodate the entire force of employees being decompressed at the end of a shift shall be provided whenever the regularly established working period requires a total time of decompression exceeding 75 minutes.

(b) Size, Capacity, and Construction. The headroom in the special decompression chamber shall be not less than 7 feet and the cubical content shall provide at least 50 cubic feet of air space for each person. For each occupant there shall be provided 4 square feet of free walking area and 3 square feet of seating space exclusive of area required for lavatory and toilet facilities. The rated capacity shall be based on the stated minimum space per person and shall be posted at the chamber entrance. The posted capacity shall not be exceeded, except in case of emergency. The chamber shall be constructed in accordance with the Unfired Pressure Vessel Safety Orders.

(c) Equipment. Each special decompression chamber shall be equipped with the following:

(d) Seating Facilities. Seating facilities in special decompression chambers shall so arranged as to permit a normal sitting posture. Seating space not less than 18 inches by 24 inches wide shall be provided per occupant.

(e) Automatic Controls. Special decompression chambers shall be equipped with automatic controls complying with Section 6090(d) and (e).

(f) Sanitation. Adequate toilet and washing facilities in a screened or enclosed recess shall be provided. Toilet bowls shall have a built-in protector on the rim so that an air space is created when the seat lid is closed. Potable drinking water shall be provided. This may be accomplished by either piping water into the special decompression chamber and providing drinking fountains, or by providing individual canteens or by some other sanitary means. Common drinking vessels shall be prohibited. The chamber shall be kept clean.

(g) Location. Unless the special decompression chamber is serving as the air lock to atmospheric pressure, the special decompression chamber shall be situated where practicable, adjacent to the air lock on the atmospheric pressure side of the bulkhead. A passageway shall be provided connecting the special chamber with the air lock to permit employees in the process of decompression to move from the air lock to the special chamber without a reduction in the ambient pressure from that designated for the next stage of decompression. The passageway shall be so arranged as to not interfere with the normal operation of the air lock nor with the release of the occupants of the special chamber to atmospheric pressure upon the completion of the decompression procedure.