[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR57.4000]

[Page 321-322]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 57--SAFETY AND HEALTH STANDARDS--UNDERGROUND METAL AND NONMETAL MINES--Table of Contents
 
                 Subpart C--Fire Prevention and Control
 
Sec. 57.4000  Definitions.

    Authority: Sec. 101, Federal Mine Safety and Health Act of 1977, 
Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 (30 U.S.C. 
811).


    The following definitions apply in this subpart.
    Booster fan. A fan installed in the main airstream or a split of the 
main airstream to increase airflow through a section or sections of a 
mine.
    Combustible liquids. Liquids having a flash point at or above 100 
deg.F (37.8  deg.C). They are divided into the following classes:

Class II liquids--those having flash points at or above 100  deg.F (37.8 
 deg.C) and below 140  deg.F (60  deg.C).
Class IIIA liquids--those having flash points at or above 140  deg.F (60 
 deg.C) and below 200  deg.F (93.4  deg.C).
Class IIIB liquids--those having flash points at or above 200  deg.F 
(93.4  deg.C).

    Combustible material. A material that, in the form in which it is 
used and under the conditions anticipated, will ignite, burn, support 
combustion, or release flammable vapors when subjected to fire or heat. 
Wood, paper, rubber, and plastics are examples of combustible materials.
    Escapeway. A designated passageway by which persons can leave an 
underground mine.
    Fire resistance rating. The time, in minutes or hours, that an 
assembly of materials will retain its protective characteristics or 
structural integrity upon exposure to fire.
    Flame spread rating. The numerical designation that indicates the 
extent flame will spread over the surface of a material during a 
specified period of time.
    Flammable gas. A gas that will burn in the normal concentrations of 
oxygen in the air.
    Flammable liquid. A liquid that has a flash point below 100  deg.F 
(37.8  deg.C), a vapor pressure not exceeding 40 pounds per square inch 
(absolute) at 100  deg.F (37.8  deg.C), and is known as a Class I 
liquid.
    Flash point. The minimum temperature at which sufficient vapor is 
released by a liquid to form a flammable vapor-air mixture near the 
surface of the liquid.
    Main fan. A fan that controls the entire airflow of an underground 
mine or

[[Page 322]]

the airflow of one of the major air circuits of the mine.
    Mine opening. Any opening or entrance from the surface into an 
underground mine.
    Multipurpose dry-chemical fire extinguisher. An extinguisher having 
a rating of at least 2-A:10-B:C and containing a nominal 4.5 pounds or 
more of dry-chemical agent.
    Noncombustible material. A material that, in the form in which it is 
used and under the conditions anticipated, will not ignite, burn, 
support combustion, or release flammable vapors when subjected to fire 
or heat. Concrete, masonry block, brick, and steel are examples of 
noncombustible materials.
    Safety can. A container of not over five gallons capacity that is 
designed to safely relieve internal pressure when exposed to heat and 
has a spring-closing lid and spout cover.
    Storage tank. A container exceeding 60 gallons in capacity used for 
the storage of flammable or combustible liquids.