30 CFR § 75.1106-4 Use of liquefied and nonliquefied compressed gas cylinders; general requirements. (a) Persons assigned by the operator to use and work with liquefied
and nonliquefied compressed gas shall be trained and designated by the
operator as qualified to perform the work to which they are assigned, and
such qualified persons shall be specifically instructed with respect to the
dangers inherent in the use of such gases in an underground coal mine. (b) Persons who perform welding, cutting, or burning operations shall
wear clothing free from excessive oil or grease. (c) Liquefied and nonliquefied compressed gas shall be used only in
well-ventilated areas. (d) Not more than one liquefied or nonliquefied compressed gas unit,
consisting of one oxygen cylinder and one additional gas cylinder, shall be
used to repair any unit of equipment which is inby the loading point of any
section. (e) Where liquefied and nonliquefied compressed gas is used regularly
in underground shops or other underground structures, such shops or
structures shall be on a separate split of air. (f) Where liquefied and nonliquefied compressed gas is used in any
area in which oil, grease, or coal dust is present, oil and grease deposits
shall, where practicable, be removed and the entire area within 10 feet of
the worksite covered with a heavy coating of rock dust. (g) Liquefied and nonliquefied compressed gas cylinders shall be
located no less than 10 feet from the worksite, and where the height of the
coal seam permits, they shall be placed in an upright position and chained or
otherwise secured against falling. (h) Liquefied and nonliquefied compressed gas shall not be used under
direct pressure from the cylinder and, where such gases are used under
reduced pressure, the pressure level shall not exceed that recommended by the
manufacturer. (i) "Manifolding cylinders" shall only be performed in
well-ventilated shops where the necessary equipment is properly installed
and operated in accordance with specifications for safety prescribed by the
manufacturer.
[36 FR 22061, Nov. 19, 1971]
