Current through Register Vol. XLI, No. 50, December 13, 2024
Section 56-23-6 - Ventilation6.1. Minimum quantities of air where diesel-powered equipment is operated shall be maintained pursuant to this section.6.2. Each specific model of diesel-powered equipment shall be approved by the director before it is taken underground. The director shall require an approval plate that must be attached to each piece of the diesel-powered equipment. The approval plate shall specify the minimum ventilating air quantity for the specific piece of diesel-powered equipment. The minimum ventilating air quantity shall be determined by the director based on the amount of air necessary at all times to maintain the exhaust emissions at levels not exceeding the exposure limits established in section 7 of this rule.6.3. The minimum quantities of air in any split where any individual unit of diesel-powered equipment is being operated shall be at least that specified on the approval plate for that equipment. Air quantity measurements to determine compliance with this requirement shall be made at the individual unit of diesel-powered equipment.6.4. Where multiple units are operated, the minimum quantity shall be at least one hundred percent of MSHA's Part 7 approval plate quantities for each unit operating in that split. Air quantity measurements to determine compliance with this requirement shall be made at the most downwind unit of diesel-powered equipment that is being operated in that air split. Should MSHA promulgate new regulations that change the MSHA Part 7 approval plate ventilation rate, the minimum quantity where multiple units are operated shall be revised on a direct ratio basis upon recommendation of the director.6.5. The minimum quantities of air on any split where any diesel-powered equipment is operated shall be in accordance with the minimum air quantities required in sections 6.1 and 6.2 and shall be specified in the mine diesel ventilation plan.