Program Policy Manual - VOLUME V - Mine Safety and Health ...

MSHA PROGRAM POLICY MANAUL VOLUME V
75.1106-2 Transportation of Liquefied and Nonliquefied
Compressed Gas Cylinders; Requirements
This section does not prohibit the transportation on mantrips
of Dewars used with supplied-air breathing devices or oxygen
bottles for self-contained breathing apparatuses or for firstaid
treatment. In addition, the transportation of any
compressed oxygen cylinders associated with approved selfcontained
self-rescuers are not controlled by this standard
because they are personal protective devices rather than
mining equipment.
75.1106-3 Storage of Liquefied and Nonliquefied
Compressed Gas Cylinders; Requirements
Paragraph (b) of this section does not require that the
cylinders be constantly attended while repair work is in
progress and cutting or welding is done intermittently.
However, the cylinders must be removed from the area inby the
last open crosscut when the repair work is completed or when
the repair work is interrupted for periods of time in excess
of 15 minutes.
The term "when not in use" as used in paragraph (c) is not
intended to be applied to intervals between intermittent cuts
or welds at a given location while work is in progress and the
cylinders are attended.
75.1107-1 Fire-Resistant Hydraulic Fluids and Fire-
Suppression Devices on Underground Equipment
"Unattended enclosed motors, controls, etc.," as used in
paragraph (a)(3) means a reasonable enclosure to afford
protection against personal contact with energized parts and
against internal deposition of dust. It does not mean
"explosion proof." The electrical insulation of components
within the "unattended enclosed" equipment is not considered
combustible material. A determination should be made in
respect to this section because equipment mounted on
combustible material, such as untreated wood, coal, or coal
dust, would be considered combustible. Equipment mounted on a
metal carriage (skid) on the bottom or a top shield, as
applicable, will be acceptable as "equivalent" as used in
paragraph (a)(3)(iii) provided: a 4-inch air space exists
between the unit and the carriage or top shield; the carriage
or top shield is substantially constructed of metal at least
1/8-inch thick; and the carriage or top shield covers the
entire underside or top surface of the unit, as applicable,
and extends at least 2 feet beyond the unit on all four sides.
October 2003 (Release V-34) 112