§ 1926.804 Definitions applicable to this subpart.

(a) Bulkhead—An airtight structure separating the working chamber from free air or from another chamber under a lesser pressure than the working pressure.

(b) Caisson—A wood, steel, concrete or reinforced concrete, air- and water-tight chamber in which it is possible for men to work under air pressure greater than atmospheric pressure to excavate material below water level.

(c) Decanting—A method used for decompressing under emergency circumstances. In this procedure, the employees are brought to atmospheric pressure with a very high gas tension in the tissues and then immediately recompressed in a second and separate chamber or lock.