MSHA HANDBOOK SERIES - PH13-V-1 - Mine Safety and Health ...

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COAL MINE SAFETY AND HEALTH GENERAL INSPECTION PROCEDURES HANDBOOK CHAPTER 3 H. Mine Gas Exposure Levels Gas TLV ® Excursion Limit Explosive Range Oxygen (O2) 19.5% min. Not Applicable Not Applicable Carbon Dioxide 0.5% 0.5%-statutory limit* Not Applicable (CO2) Carbon Monoxide 50 ppm 400 ppm for 15 min. 12% - 75% (CO) Nitric Oxide (NO) 25 ppm 37.5 ppm for 15 min. Not Applicable Nitrogen Dioxide 5 ppm-ceiling 5 ppm-ceiling limit Not Applicable (NO2) limit Methane (CH4) Not Applicable Not Applicable 5% - 15% *Persons who work or travel in bleeders or worked-out areas may be exposed to up to 3.0% carbon dioxide (CO2) for a time period not to exceed 15 minutes. Oxygen (O2) and carbon dioxide (CO2) limits are from § 75.321 (Air quality). Other limits are from ACGIH TLVs ® , 1972 (§ 75.322 (Harmful quantities of noxious gases)). I. Underground Diesel Equipment. The inspector shall inspect all in use and available for use diesel equipment to determine compliance with applicable standards and the approved ventilation plan, including attention to: exhaust gas temperatures (for outby heavy-duty diesel equipment using non-ceramic paper/synthetic diesel particulate filters), diesel emissions compliance (in accordance with Chapter 5 Diesel Exhaust Gas Monitoring of the Coal Mine Health Inspection Procedures Handbook, § 75.322 harmful quantities of noxious gases, and § 70.1900 Exhaust Gas Monitoring when used on the working sections), and compare the data from inspection records with observations made during the physical inspection of diesel equipment. Items such as permissibility, safe access, guards, equipment condition, fire suppression systems, combustible materials, fire protection, brakes, lighting, reflective devices, intake air systems, fuel system, electrical system, safety systems, hydraulic systems, audible warning devices, and other safety devices shall be evaluated as part of the inspection of diesel equipment. The data from the Diesel Inventory maintained by the mine operator on the MSHA Homepage, Online Tools, Online filing/forms Homepage/Diesel Inventory (provided by the supervisors at the beginning of each E01 regular inspection), should be compared to the equipment and records located at the mine site to determine if changes to the diesel inventory have been provided to Release 1 (February 2013) 3-68
COAL MINE SAFETY AND HEALTH GENERAL INSPECTION PROCEDURES HANDBOOK CHAPTER 3 MSHA within 7 calendar days after changes are made (§ 72.520(b) (Diesel equipment inventory)). A copy of the current MSHA Diesel Inventory Report for the subject mine should be included with each E01 completed inspection report and initialed by the inspector(s), indicating that the operator’s records, physical inspection, and MSHA Diesel Inventory comparison was made. (Refer to Diesel Equipment Inventory Q&As; Diesel Compliance Guide Q&As; Q&As Diesel Regs 1999 Utah; Diesel 1996: 61 Fed. Reg. 55412 (Oct. 25, 1996); Diesel Exhaust: 63 Fed. Reg. 12647 (Mar. 16, 1998); and Diesel Part Generators: 70 Fed. Reg. 77728 (Dec. 30, 2005) for further guidance and additional information.) The District Diesel Coordinator shall be made aware of any discrepancies found prior to issuance of any inventory-related citation and to ensure that the diesel inventory database is updated to maintain its accuracy. Evaluation of Non-Permissible Heavy-Duty Diesel-Powered Equipment, Compressors, and Generators Using an Adequate Diesel Particulate Matter (DPM) After-treatment Device: Inspectors will perform two specific evaluations to determine if an adequate DPM after-treatment device is being used. First, the operator’s diesel inventory will be reviewed. This review will determine if the listed DPM after-treatment control for each piece of diesel equipment will provide sufficient collection efficiency to reduce the DPM emissions to the level of 2.5 grams per hour. If the diesel inventory indicates the use of an inadequate DPM after-treatment device, the affected machine must be inspected to confirm the use of the stated device prior to taking enforcement action for violation of § 72.501(c) (Emission limits for nonpermissible heavy-duty diesel-powered equipment, generators and compressors). Second, inspectors, with adequate training and testing equipment, will measure the exhaust gas temperature of diesel-powered machines equipped with a nonceramic particulate filter. This evaluation is to verify that the DPM aftertreatment device is maintained in accordance with the manufacturer’s specifications as required by § 72.503(d) (Determination of emissions; filter maintenance). These specifications include conditions of use that are necessary to maintain the established collection efficiencies and are required to gain MSHA acceptance as a DPM after-treatment device. Currently accepted high-temperature disposable particulate filters (HTDPFs) must be operated in a diesel exhaust stream that is 650 degrees Fahrenheit (°F) or less to provide the established collection efficiency (80 or 83 percent depending on the model of the DPM after-treatment device). Specification sheets are hyperlinked for the two currently accepted HTDPFs (High Temp Release 1 (February 2013) 3-69
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MSHA HANDBOOK SERIES U. S. Departme
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TABLE OF CONTENTS Chapter 1 - INTRO
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19. Illumination of Work Areas ....
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V. Special Assessment .............
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COAL MINE SAFETY AND HEALTH GENERAL
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MSHA HANDBOOK SERIES - PH13-V-1 - Mine Safety and Health ...

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