Current through Register Vol. XLI, No. 50, December 13, 2024
Section 56-23-5 - Exhaust Emissions Control5.1. Underground diesel-powered equipment shall include an exhaust emissions control and conditioning system that has been laboratory tested with the diesel engine, except as provided in section 5.3., using the ISO 8178-1 test and has resulted in diesel particulate matter emissions that do not exceed an average concentration of 0.12 mg over m to the third power when diluted by one hundred percent of the MSHA Part 7 approval plate ventilation rate for that diesel engine. Should MSHA promulgate new regulations that change the MSHA Part 7 approval plate ventilation rate, the dilution percentage relative to the approval plate ventilation rate will be adjusted either up or down on a direct ratio basis upon recommendation of the director.5.2. The exhaust emissions control and conditioning system shall be required to successfully complete a single series of laboratory tests conducted at a laboratory accepted by the director for each diesel engine, except as provided in section 5.3.5.3. An exhaust emissions control and conditioning system may be approved for multiple diesel engine applications through a single series of laboratory tests, known as the ISO 8178-1 test, only if data is provided to the director that reliably verifies that the exhaust emissions control and conditioning system will meet, for each diesel engine, the in-laboratory diesel particulate matter standard established by this section. Data provided to satisfy this provision shall include diesel particulate matter production rates for the specified engine as measured during the ISO 8178-1 test, if available. If ISO 8178-1 test data for diesel particulate matter production is not available for a specified engine, comparable data may be provided to the director that reliably verifies that the exhaust emissions control and conditioning system will meet, for the specified diesel engine, the in-laboratory diesel particulate matter standard established by this section. This standard shall only be used for in-laboratory testing for approval of diesel-powered equipment for use underground.5.4. The exhaust emissions control and conditioning system shall include the following: 5.4.1. A diesel particulate matter (DPM) filter that has proven capable of at least a seventy-five percent reduction of diesel particulate matter.5.4.2. An oxidation catalyst or other gaseous emissions control device capable of reducing undiluted carbon monoxide emissions to 100 ppm or less under all conditions of operation at normal engine operating temperature range.5.4.3. An engine surface temperature control capable of maintaining significant external surface temperatures below three hundred two degrees Fahrenheit.5.4.4. A system capable of reducing the exhaust gas temperature below three hundred two degrees Fahrenheit.5.4.5. An automatic engine shutdown system that will shut off the engine before the exhaust gas temperature reaches three hundred two degrees Fahrenheit and, if waterjacketed components are used, before the engine coolant temperature reaches two hundred twelve degrees Fahrenheit. A warning shall be provided to alert the equipment operator prior to engine shutdown.5.4.6. A spark arrestor system.5.4.7. A flame arrestor system.5.4.8. A sampling port for measurement of undiluted and untreated exhaust gases as they leave the engine.5.4.9. A sampling port for measurement of treated undiluted exhaust gases before they enter the mine atmosphere.5.4.10. For in by diesel equipment, any additional requirements of MSHA regulations at 30 CFR Part 36 (relating to mobile diesel-powered transportation equipment for gassy noncoal mines and tunnels).5.5. On-board engine performance and maintenance diagnostics systems shall be capable of continuously monitoring and giving readouts for subsections 5.5.1. thru 5.5.8. of this section. The diagnostics system shall identify levels that exceed the engine and/or component manufacturer's recommendation or the applicable MSHA or director's requirements as to the following: 5.5.2. Operating hour meter;5.5.3. Total intake restriction;5.5.4. Total exhaust backpressure;5.5.5. Cooled exhaust gas temperature;5.5.6. Coolant temperature;5.5.7. Engine oil pressure;5.5.8. Engine oil temperature.