Kendrick drove a number of piles using conventional -inch-thick cushion pads to determine their characteristics for...

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Kendrick drove a number of piles using conventional -inch-thick cushion pads to determine their characteristics for the job. Eighteen were placed in the helmet and driven until they lost resiliency. Pads were added, and driving continued until a complete set of 24 was sitting in the helmet. After these were spent, the entire set was removed and the cycle repeated. The rest of the job used the CMI pads. Four were initially installed and driven until 46 piles had been placed. One pad was added and the driving continued for 184 more piles. Another pad was placed in the helmet, and the job was completed. Comparable performances for the entire job were extrapolated as follows: 1. Feet driven per hour while pile driver was at work (does not consider downtime) 2. Piles driven per set of pads 234 3. Number of pads per set 4. Number of sets required 5. Number of set changes 6. Time required for change per set 7. Kendrick cost per set Conventional Pads CMI Pads 150 200 15 300 24 6 20 1 20 1 20 minutes 4 minutes $150 Not charged Although the CMI pads drove piles 33% faster and lasted for the entire job, Sanwal felt these results were unusual. He believed that a curled metal set life of 10 times more than conventional pads, and a performance increase of 20%, were probably more reasonable, because he was uncertain that CMI pads in larger sizes would perform as well. Driving Rate Driving Time Change Time Total Time Total Saving Time Conventional Pad: CMI Pads 1 Table 1, page 3 (#Piles driven x 50ft) / Driving Rate 0.25 (#of sets required to change x time required to change each set) Driving time + Chagne Time Total time of Conventional pads - Total Time of CMI pads Kendrick drove a number of piles using conventional -inch-thick cushion pads to determine their characteristics for the job. Eighteen were placed in the helmet and driven until they lost resiliency. Pads were added, and driving continued until a complete set of 24 was sitting in the helmet. After these were spent, the entire set was removed and the cycle repeated. The rest of the job used the CMI pads. Four were initially installed and driven until 46 piles had been placed. One pad was added and the driving continued for 184 more piles. Another pad was placed in the helmet, and the job was completed. Comparable performances for the entire job were extrapolated as follows: 1. Feet driven per hour while pile driver was at work (does not consider downtime) 2. Piles driven per set of pads 234 3. Number of pads per set 4. Number of sets required 5. Number of set changes 6. Time required for change per set 7. Kendrick cost per set Conventional Pads CMI Pads 150 200 15 300 24 6 20 1 20 1 20 minutes 4 minutes $150 Not charged Although the CMI pads drove piles 33% faster and lasted for the entire job, Sanwal felt these results were unusual. He believed that a curled metal set life of 10 times more than conventional pads, and a performance increase of 20%, were probably more reasonable, because he was uncertain that CMI pads in larger sizes would perform as well. Driving Rate Driving Time Change Time Total Time Total Saving Time Conventional Pad: CMI Pads 1 Table 1, page 3 (#Piles driven x 50ft) / Driving Rate 0.25 (#of sets required to change x time required to change each set) Driving time + Chagne Time Total time of Conventional pads - Total Time of CMI pads