30 C.F.R. Subpart L—Compressed Air and Boilers
Title 30 - Mineral Resources
All boilers and pressure vessels shall be constructed, installed, and maintained in accordance with the standards and specifications of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code. (a) Reciprocating-type air compressors rated over 10 horsepower shall be equipped with automatic temperature-actuated shutoff mechanisms which shall be set or adjusted to the compressor when the normal operating temperature is exceeded by more than 25 percent. (b) However, this standard does not apply to reciprocating-type air compressors rated over 10 horsepower if equipped with fusible plugs that were installed in the compressor discharge lines before November 15, 1979, and designed to melt at temperatures at least 50 degrees below the flash point of the compressors' lubricating oil. Air receiver tanks shall be equipped with one or more automatic pressure-relief valves. The total relieving capacity of the relief valves shall prevent pressure from exceeding the maximum allowable working pressure in a receiver tank by not more than 10 percent. Air receiver tanks also shall be equipped with indicating pressure gages which accurately measure the pressure within the air receiver tanks. Compressor air intakes shall be installed to ensure that only clean, uncontaminated air enters the compressors. (a) Compressed-air receivers and other unfired pressure vessels shall be inspected by inspectors holding a valid National Board Commission and in accordance with the applicable chapters of the National Board Inspection Code, a Manual for Boiler and Pressure Vessel Inspectors, 1979. This code is incorporated by reference and made a part of this standard. It may be examined at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration, and may be obtained from the publisher, the National Board of Boiler and Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, Ohio 43229. (b) Records of inspections shall be kept in accordance with requirements of the National Board Inspection Code, and the records shall be made available to the Secretary or his authorized representative. Compressor discharge pipes where carbon build-up may occur shall be cleaned periodically as recommended by the manufacturer, but no less frequently than once every two years. Repairs involving the pressure system of compressors, receivers, or compressed-air-powered equipment shall not be attempted until the pressure has been bled off. At no time shall compressed air be directed toward a person. When compressed air is used, all necessary precautions shall be taken to protect persons from injury. Except where automatic shutoff valves are used, safety chains or other suitable locking devices shall be used at connections to machines of high-pressure hose lines of (a) Fired pressure vessels (boilers) shall be equipped with water level gauges, pressure gauges, automatic pressure-relief valves, blowdown piping, and other safety devices approved by the American Society of Mechanical Engineers to protect against hazards from overpressure, flameouts, fuel interruptions and low water level, all as required by the appropriate sections, chapters and appendices listed in paragraphs (b) (1) and (2) of this section. (b) These gauges, devices and piping shall be designed, installed, operated, maintained, repaired, altered, inspected, and tested by inspectors holding a valid National Board Commission and in accordance with the following listed sections, chapters and appendices: (1) The ASME Boiler and Pressure Vessel Code, 1977, published by the American Society of Mechanical Engineers.
Section and Title I Power Boilers II Material Specifications—Part A—Ferrous II Material Specifications—Part B—Non-ferrous II Material Specifications—Part C—Welding Rods, Electrodes, and Filler Metals IV Heating Boilers V Nondestructive Examination VI Recommended Rules for Care and Operation of Heating Boilers VII Recommended Rules for Care of Power Boilers (2) The National Board Inspection Code, a Manual for Boiler and Pressure Vessel Inspectors, 1979, published by the National Board of Boiler and Pressure Vessel Inspectors.
Chapter and Title I Glossary of Terms II Inspection of Boilers and Pressure Vessels III Repairs and Alterations to Boiler and Pressure Vessels by Welding IV Shop Inspection of Boilers and Pressure Vessels V Inservice Inspection of Pressure Vessels by Authorized Owner-User Inspection Agencies Appendix and Title A Safety and Safety Relief Valves B Non-ASME Code Boilers and Pressure Vessels C Storage of Mild Steel Covered Arc Welding Electrodes D-R National Board “R” (Repair) Symbol Stamp D-VR National Board “VR” (Repair of Safety and Safety Relief Valve) Symbol Stamp D-VR1 Certificate of Authorization for Repair Symbol Stamp for Safety and Safety Relief Valves D-VR2 Outline of Basic Elements of Written Quality Control System for Repairers of ASME Safety and Safety Relief Valves D-VR3 Nameplate Stamping for “VR” E Owner-User Inspection Agencies F Inspection Forms (c) Records of inspections and repairs shall be kept in accordance with the requirements of the ASME Boiler and Pressure Vessel Code and the National Board Inspection Code. The records shall be made available to the Secretary or his authorized representative. (d) Sections of the ASME Boiler and Pressure Vessel Code, 1977, listed in paragraph (b)(1) of this section, and chapters and appendices of the National Board Inspection Code, 1979, listed in paragraph (b)(2) of this section, are incorporated by reference and made a part of this standard. These publications may be obtained from the publishers, the American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, New Jersey 07007, Phone: 800–843–2763 (toll free); http://www.asme.org, and the National Board of Boiler and Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, Ohio 43229. The publication may be examined at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration. [50 FR 4082, Jan. 29, 1985, as amended at 71 FR 16667, Apr. 3, 2006]
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart L—Compressed Air and Boilers
§ 57.13001 General requirements for boilers and pressure vessels.
§ 57.13010 Reciprocating-type air compressors.
§ 57.13011 Air receiver tanks.
§ 57.13012 Compressor air intakes.
§ 57.13015 Inspection of compressed-air receivers and other unfired pressure vessels.
§ 57.13017 Compressor discharge pipes.
§ 57.13019 Pressure system repairs.
§ 57.13020 Use of compressed air.
§ 57.13021 High-pressure hose connections.
§ 57.13030 Boilers.
