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Mi nc~ P,r ea Seneca 11 <br />Proj ec:t Facilities - Perm Roads <br />Tas1: Rio Subarade <br />NORKSHEET N0. PR-1 <br />PRODUCTIVITY FOR DOZER USE - Ril'P ING <br />Ripping Activity After surface material is removed, rip to a depth of three <br />feet to aid in plant growth <br />Dozer/Ripper Used D-11N, 3 shank ripper, U blade <br />Description of Ripping <br />Rip Depth = 3' Volume = 3' x 30' x 46,800' = 156,000 cy <br />Cut Spacing= 6.15' per pass <br />Cut Length = 300' <br />Productivity Calculations: <br />Cycle time = T 300 ft / 88 fpm) + 0.25 = 3.66 min/pas <br />cut length speed turn tune <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 = 156,000 bcy / 2522 bcy/hr = 62 hrs. <br />vol. to be ripped hrly production <br />Cos[ Per Hour = f254.98 <br />Total Cost = 62 hrs x 5254.98 cost/hr = (15.809 <br />References: <br />Table 13-2-5 <br />Attachment 13-2 <br />• <br />• <br />• <br />