10/30/2022 0 Comments Auxiliary mine ventilation manualThe exception for headlight lenses is also applicable to lenses of all machine lighting fixtures. AUXILIARY MINE VENTILATION MANUAL WINDOWSParagraph 18.30(b) of 30 CFR Part 18 requires windows or lenses, other than headlight lenses, having an exposed area greater than 8 square inches to be provided with guarding or equivalent. The measurement shall be with an ohmmeter operating at a potential of 500 volts and having a range from 0 to 10 megohms. This criteria requires a resistivity measurement of the new belt to be 6 megohms or less when measured using two 5/8" diameter flat contacts, 8-1/2" apart on centers, moistened with water, and pressed against the belt with a force of 12-1/2 pounds per contact. 3, Edition 2, approved 1972, Power Transmission Belt Technical Bulletin, satisfy this requirement. When V-belts are used, V-belts that meet the static conducting criteria specified in the Rubber Manufacturers Association Bulletin No. The subject section requires nonmetallic rotating parts, such as belts and fans, to be provided with a means to prevent an accumulation of static electricity. This unobstructed continuous space(s) may consist of two or more spaces, the combined area of which must total a minimum of 200 square inches. Paragraph 18.22 of 30 CFR Part 18 requires each boring-type continuous-mining machine submitted for approval to be constructed with an unobstructed continuous space(s) of not less than 200 square inches total cross sectional area on or within the machine to which flexible tubing may be attached to facilitate auxiliary face ventilation. INTERPRETATION, APPLICATION AND GUIDELINES ON ENFORCEMENT OF 30 CFRġ8.22 Boring-Type Machines Equipped for Auxiliary Face
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