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Mine Area Seneca II <br />Project Facilities Gradjn9 • <br />Task Rip Facilities Area <br />WORKSHEET N0. RIPFAC•1 <br />PRODUCTIVITY FOR DOZER USE - RIPPING <br />Ripping Activity Rip facilities prior to grading <br />Dozer/Ripper Used D-11N, 3 shank ripper <br />Description of Ripping <br />Rip Depth = 3' Votume = 3' deep x 11.7 ac. = 56,630 cy <br />Cut Spacing= 6.15' per pass <br />Cut Length = 300' <br />Productivity Calcula[i ons: <br />Cycle time = [ 300 ft / 88 fpm] + 0.25 = 3.66 min/pas <br />cut length speed turn tine <br />Passes/hr = 45 min/hr / 3.66 min/pass 12_3 passes/hr <br />work hr. factor cycle time <br />Vol. cut per pass = [ 3 ft x 6.15 ft x 300 ft) / 27cf/cy = 205 bcy/pass <br />tool penetration cut spacing cut length <br />Ripping Production = 205 bcy/pass x 12.3 passes/hr 2522 bcy/hr <br />Hours Required = 56630 bcy / 2522 bcy/hr = 23 hrs. <br />vol. to be ripped hrly protluction <br />Cost Per Hour = f254.98 <br />Total Cost 23 hrs x E254.98 cost/hr = E5.865 <br />References: <br />Table 13-2-5 <br />Attachment 13-2 <br /> <br />