[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: 46CFR197.330]

[Page 428-429]
 
                           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. 197.330  PVHO--Closed bells.

    (a) Except as provided in paragraph (b) of this section, each closed 
bell must meet the requirements of Sec. 197.328 and--
    (1) Have underwater breathing apparatus for each occupant stored 
inside each separately pressurized compartment;
    (2) Have an umbilical;
    (3) Have lifting equipment attached to the closed bell capable of 
returning the occupied closed bell when fully flooded to the dive 
location;
    (4) Be capable of recompressing on the surface to the maximum design 
diving depth;
    (5) Be constructed and equipped as required by Sec. 197.332;
    (6) Have an emergency locating device designed to assist personnel 
on the surface in acquiring and maintaining contact with the submerged 
PVHO if the umbilical to the surface is severed;
    (7) Have a capability to remove an injured diver from the water; and
    (8) Have a life support capability for the intact closed bell and 
its occupants for--
    (i) Twelve hours after an accident severing the umbilical to the 
surface when the umbilical to the surface is

[[Page 429]]

the only installed means of retrieving the closed bell; or
    (ii) A period of time, at least equal to 1 hour plus twice the time 
required to retrieve the bell from its designed operating depth and 
attach an auxiliary lifesupport system, after an accident severing the 
umbilical to the surface when the umbilical is one of the two 
independent installed means of retrieving the closed bell, each meeting 
the requirements of paragraph (a)(3) of this section.
    (b) A closed bell that does not meet the requirements of paragraphs 
(a)(3), (a)(4), and (a)(5) of this section, must be capable of 
attachment to another PVHO that--
    (1) Allows the transfer of personnel and diver's equipment under 
pressure from the closed bell to the PVHO;
    (2) Meets the requirements of paragraph (a)(3) of this section;
    (3) Is capable of attachment to a decompression chamber meeting the 
requirements of paragraphs (a)(4) and (a)(5) of this section; and
    (4) Allows the transfer of personnel and diver's equipment under 
pressure from the PVHO to the decompression chamber.