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

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MSHA PROGRAM POLICY MANAUL VOLUME V Two or more manual controls shall be installed where practical. "Where practical" has reference to the size of the machine protected and possible avenues of approach. One control, for example, may suffice on a small roof drilling machine. Normally, the two controls should be on opposite ends or at least one of them in a position away from the operator's cab. The purpose of the two controls is to offer an alternate, should fire, heat or smoke engulf one set of controls. Sensors as addressed in paragraph (b) shall, where practicable, be installed above the area of the equipment that is likely to produce the most heat in the event of a fire. Paragraph (c) requires that where the fire-suppression system is dependent on the mine power supply, the power supply to the fire-suppression system must originate on the line side of the overload protection of the equipment being protected. The purpose of paragraph (e) of this Section is to provide a rapid means of determining that the system is operative. Any effective method will be acceptable. 75.1107-5 Electrical Components of Fire-Suppression Devices; Permissibility Requirements This Section and Section 75.1107-6 are general requirements for fire-suppression devices which permit the inspector to require proper devices for unusual conditions to insure that adequate fire controls will be achieved. 75.1107-6 Capacity of Fire-Suppression Devices; Location and Direction of Nozzles "Enclosed to minimize runoff and overshoot of the extinguishing agent," as used in paragraph (b) of this Section, does not prohibit necessary openings in cable-reel compartments to facilitate cleanliness of equipment, provided the discharge nozzle is not directed toward the openings. Where practicable, and within the intent of these regulations, extinguishant nozzles shall not be located where accidental discharge of the system will endanger the operator of such equipment. October 2003 (Release V-34) 117
MSHA PROGRAM POLICY MANAUL VOLUME V 75.1107-7 Water Spray Devices; Capacity; Water Supply; Minimum Requirements "Inundating" means covering the whole top of the machine either by direct or indirect water spray. "Internal injection" means directing the extinguishing agent into the compartment of the machine. Past experience has shown that approximately 40 percent of the fires on machines have had a cable to ignite in the cable reel compartment. Some of these fires may have been caused by poor splices and the excessive heat liberated in the coiled cable. Whether fire control with water is achieved by inundating or internal injection, the indicated amount of water shall be directed into the cable reel compartment. The requirements of paragraph (f) state that the quantity of liquid stored on the machine can be reduced appreciably if certain approved liquid chemicals are added to the water. Tests show that a potassium bicarbonate solution is three to four times more effective than plain water. However, potassium bicarbonate solution is corrosive to unalloyed steel. Other chemicals that are noncorrosive or contain inhibitors are as effective for fire control. The use of liquid chemical is not mandatory, but the industry should be encouraged to use such additives in water. 75.1107-8 Fire-Suppression Devices; Extinguishant Supply Systems The purpose of the rising stem, or other visual indicator-type shutoff valve addressed in paragraph (a)(4), is to provide a visual means for assuring that the control valve is in the open position while the machine is operating. "Reasonable time for changing hose," as used in paragraph (b) means without unnecessary delay. 75.1107-9 Dry Chemical Devices; Capacity; Minimum Requirements In paragrapsh (b) and (c) of this Section and subsequent regulations, the word "nominal" is used to express the approximate weight in pounds of all-purpose dry chemical. 75.1107-11 Extinguishing Agents; Requirements on Mining Equipment Employed in Low Coal This Section provides for lesser quantities of extinguishants on equipment with space limitations. However, there may be instances where the equipment is less than 32 inches high and October 2003 (Release V-34) 118
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