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Mine Area Yoast • <br />Project Facilities - Haul Roads <br />Task Rio Subcrade <br />VORKSHEET N0. HR-t <br />PRODUCTIVITY FOR D02ER USE RIPPING <br />Ripping Activity: After surface material is pushed off, rip to a depth of three feet to aid in plant <br />growth <br />Dozer/Ripper Used: D-)1N, 3 shank ripper, U Blade <br />Description of Ripping: <br />rip depth = 3' Volume = 3' x 24' x 2,400' = 6,4D0 <br />cut spacing = 6.15' per pass <br />cut length = 300' <br />Productivity Calculations: <br />Cycle time = ( 300 ) ft / 88 fpm) ~ 0.25 3.66 min/pass • <br />cut Length speed turn time <br />Passes/hour = 45 min/hr / 3.66 min/pass = 12.3 passes/hr <br />work hr. factor cycle time <br />Volume cut = ( 3 ft x 6.15 ft x 300 ft) / 27 cf/cy = 205 bcy/pass <br />per pass tool cu[ cut <br />penetration spacing length <br />Ripping Production = 205 bcy/pass x 12.3 passes/hr = 2.522 bcy/hr <br />Hours Required = ( 6.400 bcy / 2.522 bch/hr) x = 3 hrs <br />volume hourly <br />to be ripped production <br />Cost = 5254.98 <br />Total Lost = 3 hrs. x 5254.98 cost/hr = 5765 <br />References: <br />Table 25-2-5 <br />Act ac hment 25-2 <br />25-4-10 <br />