[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR197.322]

[Page 427]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 197_GENERAL PROVISIONS--Table of Contents
 
                 Subpart B_Commercial Diving Operations
 
Sec. 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.