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

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GENERAL COAL MINE INSPECTION PROCEDURES AND INSPECTION TRACKING SYSTEM HANDBOOK CHAPTER 5 Figure 5-3: Velocity Table for Smoke Cloud Measurements Release 1 (February 2013) 5-11
GENERAL COAL MINE INSPECTION PROCEDURES AND INSPECTION TRACKING SYSTEM HANDBOOK CHAPTER 5 C. Rock Dust Samples. Mine Dust Sampling Mine operators are responsible for maintaining the minimum incombustible content specified in § 75.403 (Maintenance of incombustible content of rock dust) for mine dust (mixtures of coal dust, float coal dust and rock dust). This incombustible content must be maintained throughout all accessible areas of the coal mine except for within 40 feet of working faces or where the dust is too wet or too high in incombustible content to propagate an explosion as specified in § 75.402. Completed crosscuts that are less than 40 feet from a working face must also be rock dusted. Accessible areas encompass travelable portions of the coal mine including bleeders and worked-out areas where pillars have not been removed. Areas that are unsafe to enter include areas with unsupported roof, subsiding areas, pillared areas and any other area that poses an identifiable risk to the examiner that cannot be reasonably mitigated (such as by deenergizing and locking out a belt drive). Accessible areas also include areas that are merely hard to access such as the area between a conveyor belt and an adjacent rib. The incombustible content of rock dust will be evaluated during regular inspections and spot inspections. This evaluation will include the collection and analysis of mine dust samples. Samples will be sent to the National Air and Dust Laboratory (NADL). MSHA’s collection of mine dust samples and analysis of incombustible content is only for oversight and enforcement of the mine operators compliance with § 75.403. To evaluate compliance, mine dust samples should be collected from various locations within the coal mine. Sample locations should be chosen by the mine inspector based on visual identification of potentially non-compliant conditions and other factors such as the proximity to float coal dust sources. Band samples, which are comprised of mine dust from the roof, ribs, and floor, may be collected from crosscuts or entries. All significant accessible air courses in the mine should be periodically sampled. A significant air course is of sufficient length to justify separate sampling. For example: near a return shaft bottom, several aircourses typically merge within a relatively short distance. Although each separate split that combines with another split starts a new air course, for mine dust sampling purposes, these short sections that merge should be treated as extension of the main aircourses. Likewise, a short split of air used to ventilate seals and is then directed to the return is not a significant air course. When evaluating the significance of an air course, the inspector should weigh the area involved and the potential for coal dust Release 1 (February 2013) 5-12
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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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