[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.