[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR36.45]
[Page 186]
TITLE 30--MINERAL RESOURCES
CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
PART 36_APPROVAL REQUIREMENTS FOR PERMISSIBLE MOBILE DIESEL-POWERED
TRANSPORTATION EQUIPMENT--Table of Contents
Subpart C_Test Requirements
Sec. 36.45 Quantity of ventilating air.
(a) Results of the engine tests shall be used to calculate
ventilation (cubic feet of air per minute) that shall be supplied by
positive air movement when the permissible mobile diesel-powered
transportation equipment is used underground. This quantity shall be
stamped on the approval plate. The quantity so determined shall apply
when only one machine is operated.
(b) Determination of the ventilation rate shall be based upon
dilution of the exhaust gas with normal air. The most undesirable and
hazardous condition of engine operation prescribed by MSHA shall be used
in the calculations. The concentration of any of the following
individual constituents in the diluted mixture shall not exceed:
0.25 percent, by volume, of carbon dioxide (CO2).
0.005 percent, by volume, of carbon monoxide (CO).
0.00125 percent, by volume, of oxides of nitrogen (calculated as
equivalent nitrogen dioxide, NO2).
The oxygen (O2) content of the diluted mixture shall be not
less than 20 percent, by volume. The maximum quantity of normal air to
produce the above dilution shall be designated the ventilation rate.
Note: This ventilation rate will provide a factor of safety for
exposure of persons to air mixtures containing harmful or objectionable
gases and for minor variations in engine performance.