§197.322. Surface-supplied helmets and masks.
46 C.F.R. § 197.322
Each surface-supplied helmet or mask must have—
A nonreturn valve at the attachment point between helmet or mask and umbilical that closes readily and positively;
An exhaust valve; and
A two-way voice communication system between the diver and the dive location or bell.
Each surface-supplied air helmet or mask must—
Ventilate at least 4.5 ACFM at any depth at which it is operated; or
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.
Notes, amendments, and revision history
Authority
Authority: 33 U.S.C. 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703, 6101; Department of Homeland Security Delegation No. 0170.1.
Source
Source: CGD 76-009, 43 FR 53683, Nov. 16, 1978, unless otherwise noted.