1910.422—Procedures during dive.
(a) General.
The employer shall comply with the following requirements which are applicable to each diving operation unless otherwise specified.
(b) Water entry and exit.
(1)
A means capable of supporting the diver shall be provided for entering and exiting the water.
(i)
Each surface-supplied air or mixed-gas diver and a dive team member at the dive location or bell (when provided or required); and
(2)
An operational, two-way communication system shall be available at the dive location to obtain emergency assistance.
(d) Decompression tables.
Decompression, repetitive, and no-decompression tables (as appropriate) shall be at the dive location.
(e) Dive profiles.
A depth-time profile, including when appropriate any breathing gas changes, shall be maintained for each diver during the dive including decompression.
(f) Hand-held power tools and equipment.
(1)
Hand-held electrical tools and equipment shall be de-energized before being placed into or retrieved from the water.
(2)
Hand-held power tools shall not be supplied with power from the dive location until requested by the diver.
(g) Welding and burning.
(1)
A current supply switch to interrupt the current flow to the welding or burning electrode shall be:
(i)
Tended by a dive team member in voice communication with the diver performing the welding or burning; and
(3)
Welding and burning cables, electrode holders, and connections shall be capable of carrying the maximum current required by the work, and shall be properly insulated.
(5)
Prior to welding or burning on closed compartments, structures or pipes, which contain a flammable vapor or in which a flammable vapor may be generated by the work, they shall be vented, flooded, or purged with a mixture of gases which will not support combustion.
(h) Explosives.
(1)
Employers shall transport, store, and use explosives in accordance with this section and the applicable provisions of § 1910.109 and § 1926.912 of Title 29 of the Code of Federal Regulations.
(2)
Electrical continuity of explosive circuits shall not be tested until the diver is out of the water.
(3)
Communications are lost and can not be quickly re-established between the diver and a dive team member at the dive location, and between the designated person-in-charge and the person controlling the vessel in liveboating operations; or
(4)
A diver begins to use diver-carried reserve breathing gas or the dive-location reserve breathing gas.