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SAFETY PRECAUTIONS FOR FULL RO0F-BOETIN6 (Cont.) <br />12. A minimum of 20 posts of proper length with sufficient cap <br /> pieces and wedges, and where regularly understood, at <br />• least 6 crossbars shall be provided as close as practical <br /> to the working places andior in a location where they can <br /> be delivered to the working place within 30 minutes. <br />13. Permanent roof supports shall not be recoverec. <br />i4. An approved, calibrated torque wrench that will indicate <br /> the actual torque on the point anchor roof bolts by z <br /> aired reading shall be provided on each roof bolting <br /> machine in operation. <br />15. Immediately after the first point anchor bolt is installed <br /> in each place, the torque shall be tested ono thereafter <br /> at least one roof bolt out of ever y four shall be tested <br /> by a qualified person. I. any of the bolts tested ao not <br /> fall within the required torque range, the remzininq bre- <br /> viously installed bolts on this cycle snail be tested. <br /> If the majority of the bol±s still fall outside the <br /> required torque range, necessary adjustments shall be made <br /> immediately. If, after these adjustments are made, the <br /> required torque ranyes are still not obtained, supplemen- <br /> tary supports sucn zs cifferent length rod` cclts h',th <br /> adequate anchorage, posts, trios, or crossbars shill be <br />• instilled. <br />16. N spot-check on toroues on point anchor resin bolts shall <br /> be made eurinq earn 24-hour period on at bast one roof <br /> bolt out of every ten from the outby corner of the last <br /> open crosscut to the facE. Such torque checks are neges- <br /> sary only in advancing sections in working places produc- <br /> ing coal during any portion of the aforementioned 24-hour <br /> period. <br /> The results o` these tests shall be recorded in the on- <br /> shift examination book. The record shall shop the number <br /> of bolts tested znd number above and below the required <br /> range. <br /> If the results show that thF majority of the bolts are not <br /> maintaining at least y0 foot-pounds. (Stratabolt) or 140 <br /> foot-pounds. (Birmingham) of torque or have loaded up to <br /> where they exceed 240 foot-pounds (Stratabolt) or 360 <br /> foot-pounds. (Birmingham) of torque, supplementary sup- <br /> port such as additional roof bolts, longer roof bolts with <br /> adequate anchorage, posts, cribs, or crossbars shall be <br /> installed. <br />• <br />Page Seven <br />Revised U6/04/80 <br />Revised 02/04/83 <br />