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 Equipment that may be needed includes: 1. Permissible vacuum pump with sufficient power to pull a sample through a sampling pipe in seals that are ingassing; 2. Tubing, adapters, connectors, etc.; 3. High range methane detector; 4. Standard range methane detector (less than 5%); 5. Oxygen (O2) detector; 6. Carbon dioxide (CO2) detector, if an alternative method is approved under § 75.336(d) to determine the inert status of the sealed atmosphere; 7. Bags to collect samples; 8. Double pointed needle syringe; and 9. Gas sample tubes. Multi-gas detectors should be used during regular inspections and bag samples should only be used to verify compliance if a detector indicates the atmosphere behind a seal may be non-inert. If the handheld detector indicates oxygen (O2) levels of 8.5% or greater and methane (CH4) levels between 2.5% and 23%, a bag sample should be taken. It is not necessary to collect bag samples at each set of seals during quarterly inspections. Pumping must continue long enough to purge the sampling tube and line with six times the volume of the sample system prior to extracting the sample. Note: The typical handheld gas detector uses catalytic heat-of-combustion sensing technology. These sensors require oxygen to operate. The IEC standard for selection, installation, use, and maintenance of combustible gas detectors indicates that the minimum oxygen concentration for use of this type of sensor is 10%. The ATX 620 or its equivalent is typically used for sampling areas with suspected oxygen content below normal ranges. This device has an infrared sensor that enables the instrument to properly measure methane content when oxygen levels are at or below 10%. Inspect the water drainage system and check for lack of air exchange (test with chemical smoke). Examine the drainage pipe system and verify that seals do not impound water or slurry. If a drainage system includes a valve, it must be opened as part of the inspection. Confirm that the certified persons conducting sampling have been trained in the use of the sampling equipment and sampling procedures. Check the required training records and certifications under § 75.338. New seal installations must be inspected by MSHA during construction. Inspectors should examine both sides of seals during construction. Section Release 1 (February 2013) 3-54
COAL MINE SAFETY AND HEALTH GENERAL INSPECTION PROCEDURES HANDBOOK CHAPTER 3 75.337(e)(1) (Construction and repair of seals) requires the mine operator to notify the District Manager between 2 and 14 days prior to commencement of seal construction. An inspection, which may coincide with a quarterly inspection, a Section 103(i) spot inspection, or other inspection type events must be conducted during construction of each set of seals. This construction inspection will assist in determining the mine operator’s compliance with MSHA’s existing seals standard and the mine’s ventilation plan including: 1. Proper site preparation; 2. Sealed area preparation; 3. Seal construction; 4. Training; 5. Examinations; 6. Recordkeeping including certifications; and 7. Any other requirements specified in the approved ventilation plan. § 75.337(e)(2) (Construction and repair of seals) includes a requirement for the mine operator to notify the District Manager in writing within five days of completion of a set of seals. After construction is completed, seals must be inspected by MSHA during the next regular inspection. The focus of the inspection of newly completed seals should be to determine the mine operator’s compliance with the requirements of MSHA’s existing seals standard and the mine’s ventilation plan, including: 1. Seal construction; 2. Quality control tests; 3. Certifications; 4. Examinations; 5. Post-sealing ventilation; 6. Rock-dusting; 7. Sampling pipes and water drainage system; 8. Roof support; and 9. Any other requirements specified in the approved ventilation plan. Documentation Required: Each set of seals inspected under this procedure should be listed in the inspection notes and include the name, location, and the number of seals in the set. 14. Track and Off-Track Haulage Roads. The inspector shall review the mine operator’s examination of track and off-track haulage roads to assure the mine operator is examining all haulage roads. The inspector will assure all haulage roads required to be examined are maintained and identified in the ITS. Each haulage road shall be inspected, for compliance with applicable standards, and Release 1 (February 2013) 3-55
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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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