Mine Safety and Health Administration
Protecting Miners' Safety and Health Since 1978
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U.S. Department of Labor Mine Safety and Health Administration Protecting Miners' Safety and Health Since 1978 |
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PIB02-07
APPENDIX TAILPIPE TEST PROTOCOL Tailpipe nitrogen dioxide (NO2) emission data can be collected while conducting the repeatable loaded engine test required for all heavy duty and permissible equipment under the weekly carbon monoxide (CO) check [30 CFR 75.1914(g)]. This test measures the undiluted CO emissions of the engine operating under a loaded condition. This same test procedure can be used to measure undiluted NO2 emitted from the engine. The test can be performed inside or outside the mine. For machines which have torque converters: 1. Operate the machine until the engine coolant gauge stabilizes (reaches operating temperature). 2. Shut the engine off. 3. Apply the supplemental (park/emergency) brake and chock the wheels (or other means to prevent machine movement). 4. Insert the gas sampling probe on the engine side of the platinum (Pt) catalyzed filter into the port normally used to measure engine exhaust system back pressure. The port may be sealed with a pipe plug or have a hose which connects to a back pressure gauge. 5. Apply the service brakes. 6. Start the engine and begin measuring the exhaust gas with the engine operating at low idle. 7. Place the transmission in 2nd or 3rd gear and depress the throttle to the full position and operate in this condition for at least one minute. 8. Record the maximum value of NO2 obtained before the filter. 9. Allow the torque converter to cool to the normal operating temperature (may take several minutes). 10. Shut the engine off. 11. Relocate the gas sampling probe to measure the exhaust gas in a location out-by the filter (but in the stream of raw exhaust gas). 12. Repeat steps 5 through 7. 13. Record the maximum value of NO2 obtained after the filter. Calculation of Air Quantity a. Determine the increase of NO2 caused by the filter. For example, if the NO2 measured before the filter (from step 8) is 10 ppm and after the filter (from step 13) is 70 ppm, this is a 7 times increase (70ppm / 10ppm = 7). b. Obtain the MSHA ventilation rate for NO2 listed on MSHA's webpage for that specific engine (http://www.msha.gov/regs/complian/pib/2002/pib02-07attach.htm) and increase this rate by the same multiplier. If this calculated value exceeds the ventilation rate listed on the nameplate for the engine, the new value should be considered the air quantity necessary to dilute NO2 emissions to safe concentrations. For example, the MSHA nameplate ventilation air quantity for the Deutz F6L912W engine is 4500 cfm. From the web site list, the NO2 ventilation rate for this engine is given as 1500 cfm. If the NO2 measured during the test of the machine increased 7 times, then (1500 cfm x 7) = 10,500 cfm. Since 10,500 cfm is greater than 4500 cfm, the adjusted ventilation requirement for this machine would be 10,500 cfm. For machines which do not have torque converters: The test can be conducted in the same manner as described above for machines equipped with torque converters, except the machine should be operated fully loaded while the NO2 is measured before and after the Pt catalyzed ceramic filter. In some cases, the machine will have to be trammed and/or operated to achieve a loaded condition. The increase in NO2 is again applied to the NO2 ventilation rate posted on the MSHA webpage, and if this calculated value exceeds the ventilation rate listed on the nameplate for the engine, the new value should be considered the air quantity necessary to dilute NO2 emissions to safe concentrations. The District Manager should be contacted if there are any questions regarding either the tailpipe test procedure or the calculation of applicable air quantities. |
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Mine Safety and Health Administration (MSHA) 1100 Wilson Boulevard, 21st Floor Arlington, VA 22209-3939 |
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