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Home , Breathing gas

Coast Guard, DHS § 197.344

(b) Be protected from excessive heat; the dive location or planned pick-up (c) Be prevented from falling; point. (d) Be tested after any repair, modi- (e) A diver-carried reserve fication, or alteration to the supply for must be boundaries as set forth in § 197.462; and sufficient to allow to return (e) Meet the requirements of— to the dive location or planned pick-up (1) Part 54 of this chapter; or point from the greatest depth of the (2) 49 CFR 173.34 and 49 CFR part 178, planned dive. subpart C. (f) used for breathing mix- tures must— § 197.340 supply. (1) Meet the requirements of Federal (a) A primary breathing gas supply Specification BB-0–925a; and for surface-supplied diving must be suf- (2) Be type 1 (gaseous) grade A or B. ficient to support the following for the (g) used for breathing mix- duration of the planned dive: tures must— (1) The diver. (1) Meet the requirements of Federal (2) The standby diver. Specification BB-N–411c; (3) The chamber, when (2) Be type 1 (gaseous); required by § 197.432(e)(2) or by (3) Be class 1 (oil free); and § 197.434(a) for the duration of the dive (4) Be grade A, B, or C. and for one hour after completion of (h) used for breathing mix- the planned dive. tures must be grades A, B, or C pro- (4) A decompression chamber when duced by the Federal Government, or provided but not required by this sub- equivalent. part. (i) used for breathing (5) A closed bell when provided or re- mixtures must— quired by § 197.434(d). (1) Be 20 to 22 percent oxygen by vol- (6) An open bell when provided or re- ume; quired by § 197.432(e)(4) or by § 197.434(c). (2) Have no objectionable odor; and (b) A secondary breathing gas supply (3) Have no more than— for surface-supplied diving must be suf- (i) 1,000 parts per million of carbon ficient to support the following: dioxide; (1) The diver while returning to the (ii) 20 parts per million carbon mon- surface. oxide; (2) The diver during decompression. (iii) 5 milligrams per cubic meter of (3) The standby diver. solid and liquid particulates including (4) The decompression chamber when oil; and required by § 197.432(e)(2) or by (iv) 25 parts per million of hydro- § 197.434(a) for the duration of the dive carbons (includes methane and all and one hour after the completion of other expressed as meth- the planned dive. ane). (5) The closed bell while returning the diver to the surface. § 197.342 -changing devices. (6) The open bell while returning the (a) A or other buoyancy- diver to the surface. changing device not directly connected (c) A diver-carried reserve breathing to the exhaust of the helmet or gas supply for surface-supplied must have an independent ex- must be sufficient to allow the diver haust valve. to— (b) When used for SCUBA diving, a (1) Reach the surface. buoyancy-changing device must have (2) Reach another source of breathing an inflation source separate from the gas; or breathing gas supply. (3) Be reached by a standby diver equipped with another source of § 197.344 Inflatable floatation devices. breathing gas for the diver. An inflatable floatation device for (d) A primary breathing gas supply SCUBA diving must— for SCUBA diving must be sufficient to (a) Be capable of maintaining the support the diver for the duration of diver at the surface in a faceup posi- the planned dive through his return to tion;

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