[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: 30CFR7.84]

[Page 30]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 7--TESTING BY APPLICANT OR THIRD PARTY--Table of Contents
 
  Subpart E--Diesel Engines Intended for Use in Underground Coal Mines
 
Sec. 7.84  Technical requirements.

    (a) Fuel injection adjustment. The fuel injection system of the 
engine shall be constructed so that the quantity of fuel injected can be 
controlled at a desired maximum value. This adjustment shall be 
changeable only after breaking a seal or by altering the design.
    (b) Maximum fuel-air ratio. At the maximum fuel-air ratio determined 
by Sec. 7.87 of this part, the concentrations (by volume, dry basis) of 
carbon monoxide (CO) and oxides of nitrogen (NOX) in the 
undiluted exhaust gas shall not exceed the following:
    (1) There shall be no more than 0.30 percent CO and no more than 
0.20 percent NOX for category A engines.
    (2) There shall be no more than 0.25 percent CO and no more than 
0.20 percent NOX for category B engines.
    (c) Gaseous emissions ventilation rate. Ventilation rates necessary 
to dilute gaseous exhaust emissions to the following values shall be 
determined under Sec. 7.88 of this part:


Carbon dioxide.........................  -5000 ppm
Carbon monoxide........................  -50 ppm
Nitric oxide...........................  -25 ppm
Nitrogen dioxide.......................  -5 ppm



A gaseous ventilation rate shall be determined for each requested speed 
and horsepower rating as described in Sec. 7.88(b) of this part.
    (d) Fuel deration. The fuel rates specified in the fuel deration 
chart shall be based on the tests conducted under paragraphs (b) and (c) 
of this section and shall ensure that the maximum fuel:air (f/a) ratio 
determined under paragraph (b) of this section is not exceeded at the 
altitudes specified in the fuel deration chart.
    (e) Particulate index. For each rated speed and horsepower 
requested, the particulate index necessary to dilute the exhaust 
particulate emissions to 1 mg/m3 shall be determined under 
Sec. 7.89 of this part.