Program Policy Manual - VOLUME V - Mine Safety and Health ...

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MSHA PROGRAM POLICY MANUAL VOLUME V fire at the belt flight or at a manned location where personnel have communication with all miners who may be endangered. The visual signal shall be capable of attracting the attention of persons referred to in paragraphs (a)(1) and (a)(2) under normal mine lighting conditions. Both signals need not be located in the same place. In some instances, the signals may be acceptable located a considerable distance apart, provided such signals can be seen or heard by responsible persons. An alarm signal at the section telephone equivalent to that of a loud speaking telephone or "Page" system will be accepted for compliance with paragraph (a). Sensors responding to effects of fire other than heat may be acceptable subject to individual determination. The Technical Support Group, Bruceton, Pennsylvania, will provide assistance where needed in making this determination. Means for "Rapid Evaluation" as addressed in paragraph (b) is any method that will effectively demonstrate that the sensor and warning device systems are operative and capable of performing in the event of a fire. This will be determined on a system-bysystem basis by the district manager. MSHA will accept a system in which the trouble signal is or is not distinctive from the alarm signal. However, in this later instance, both the trouble and alarm signal will indicate a "fire" situation. The mine operator will then be required to respond to the signal prepared to control a fire. That is to say, that the communication lines need not be electrically monitored for short circuits, ground faults, and open circuits. If communication lines are incorporated into a fire-warning system, MSHA will accept the use of communication systems without electrical supervision. 75.1103-6 Automatic Fire Sensors; Actuation of Fire- Suppression Systems The fire sensor and suppression devices required at belt drives under Section 75.1101 may be separate and apart from the sensor and alarm system required under Section 75.1103, except that the sensor and alarm system required under Section 75.1103 shall transverse and include the belt drive area. If the systems required under Sections 75.1101 and 75.1103 are combined and are interconnected, then the more stringent requirements of Section October 2003 (Release V-34) 107
MSHA PROGRAM POLICY MANUAL VOLUME V 75.1103-7(b) shall apply. For example, if the sensor and alarm system under Section 75.1103 is intrinsically safe, then interconnected fire-suppression devices under Section 75.1101 shall also be intrinsically safe. 75.1103-7 Electric Components; Permissibility Requirements In order for the sensor and alarm system to remain functional as required by Section 75.1103-4(e), the source of power can be the line side of the circuit breaker or other protective device normally used to stop the belt. When battery-powered systems are used to comply with this section, a relay may be used to disconnect the battery power supply. A manually-operated on/off switch actuated by a miner as he leaves the section is not acceptable. 75.1103-9 Minimum Requirements; Fire Suppression Materials and Location; Maintenance of Entries and Crosscuts; Access Doors; Communications; Fire Crews; High-expansion Foam Devices One supply of materials required by paragraph (a) of this Section will suffice for two belt drives, provided the supply is located within 300 feet of each drive unit and the ventilating current in both belt drive entries travels in a direction opposite that of the normal movement of the belts. "Five hundred feet of fire hose" required by paragraph (a)(1) of this Section may be satisfied by the same fire hose required by Section 75.1100-2(b) or (c) if such hose is within 300 feet of the belt drive or tailpiece, as applicable. The fire suppression required by paragraphs (a)(2) and (d) of this Section may be an extension of the system required by Section 75.1101 or a separate system installed at the belt "discharge head." In either case, the fire suppression system need cover only the belt discharge head in addition to that area now protected by the requirements of Section 75.1101. "A crew consisting of at least five members" as used in paragraph (e) of this Section means any five men within the mine during the same working shift. 75.1103-11 Test of Fire Hydrants and Fire Hose; Record of Tests Fire hose shall be tested annually to ensure that the hose and couplings are serviceable. The test shall include unreeling and reloading all of the fire hose at each depot and flowing water through hose with a nozzle attached. The nozzle, if adjustable, shall be opened and closed quickly to introduce shock to the system. When the fire hose is made up of sections, at least one October 2003 (Release V-34) 108
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