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Code · CFR · Title 30 — Mineral Resources · Part 33 · § 33.35

§ 33.35. Methods of drilling; dust-collector unit.

311 words·~1 min read·/us/cfr/t30/s§ 33.35·

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(a)General. All drilling shall be done with conventional, commercial drilling equipment---pneumatic-percussion, hydraulic-rotary, and/or electric-rotary types---in accordance with the applicant's specifications.
(b)Pneumatic-percussion drilling. A stoper-type drill with a piston diameter of 2 1/2 to 3 inches shall be used for roof drilling, A hand-held, sinker-type drill with a piston diameter of 2 1/2 to 3 inches shall be used for down drilling and also for horizontal drilling, except that the drill shall be supported mechanically. Compressed air for operating the drill shall be supplied at a gage pressure of 85-95 pounds per square inch. Drill bits shall be detachable, cross type with hard inserts, and shall be sharp when starting to drill each set of 10 holes. In roof drilling, 1 1/4- and 1 1/2-inch diameter drill bits shall be used; in horizontal and down drilling, 1 3/4-inch diameter bits shall be used. The drill steel shall be 7/8-inch hexagonal and of hollow type to permit the introduction of compressed air through the drill steel when necessary to clean a hole during drilling.
(c)Rotary drilling. A hydraulic-rotary drill with a rated drilling speed of 18 feet per minute free lift, capable of rotating drill steel at 900 revolutions per minute with 100 foot-pounds torque, and having a feed force of 7,000 pounds, shall be used for roof drilling. An electric-rotary drill, supported by a post mounting, with a rated drilling speed of 30 inches per minute and powered by a 2.25 horsepower motor, shall be used for horizontal drilling. For roof drilling, the bits shall be hard-tipped, 1 3/8 and 1 1/2 inches outside diameter, and 1 1/4-inch auger-type drill steel shall be used. For horizontal drilling, the bits shall be hard-tipped, 2 inches outside diameter, and 1 3/4-inch auger-type drill steel shall be used. Drill bits shall be sharp when starting to drill each set of 10 holes.
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