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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 46 - Shipping |
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Chapter I - Coast Guard, Department of Homeland Security |
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SubChapter V - Marine Occupational Safety and Health Standards |
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Part 197 - General Provisions |
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Subpart B - Commercial Diving Operations |
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Equipment |
§ 197.322 - Surface-supplied helmets and masks.
Latest version.
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§ 197.322 Surface-supplied helmets and masks.
(a) Each surface-supplied helmet or mask must have -
(1) A nonreturn valve at the attachment point between helmet or mask and umbilical that closes readily and positively;
(2) An exhaust valve; and
(3) A two-way voice communication system between the diver and the dive location or bell.
(b) Each surface-supplied air helmet or mask must -
(1) Ventilate at least 4.5 ACFM at any depth at which it is operated; or
(2) Be able to maintain the diver's inspired carbon dioxide partial pressure below 0.02 ATA when the diver is producing carbon dioxide at the rate of 1.6 standard liters per minute.