[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: 30CFR36.45]

[Page 175]
 
                       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.