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HELICAL DRIVER TORQUE CHART
<br /> Eskridge 7K Dealer :
<br /> Ram Jack Systems Distribution, LLC MJACK
<br /> 13655 County Road 1570
<br /> Ada, OK 74820
<br /> Torque Equation
<br /> Hydraulic Motor : Pressure*displacemen
<br /> Model : Eskridge Model 54-25 T= Gear Ratio* *77
<br /> Displacement (in 3) : 10.6 24 R motor gear
<br /> where : Pressure = hydraulic pressure(psi)
<br /> Gear Drive : displacement = hydraulic motor displacement(in 2)
<br /> Model : Code 135 - Nichols 111A106ASOF q motor = motor efficiency
<br /> Ratio : 25.53 17 gear = gear drive efficiency
<br /> Torque Chart
<br /> Pressure (psi) 500 1 750 1 1,000 1 1,250 1 1,500 1 1,750 1 2,000 1 2,250 1 2,500 1 2,760 1 3,000
<br /> Torque (ft-lbs) 1,449 1 2,174 1 2,898 1 3,623 1 4,347 1 5,072 1 5,797 1 6,521 1 7,246 1 7,970 1 8,696
<br /> *NOTE : The torque can also be calculated at any hydraulic pressure by multiplying the pressure by the psi/torque factor for this
<br /> helical driver which is 2.898.
<br /> Ultimate Capacity'°2,3
<br /> 2 3/8" dia.shaft(K, = 10) 14,491 21,737 28,983 36,228 40,000
<br /> 2 7/8" dia. shaft(Kr =9) 13,042 19,563 26,084 32,605 39,127 45,648 52,169 58,690 65,211 71,732 73,800
<br /> 3 1/2" dia. shaft(Kr = 7) 10,144 15,216 20,288 25,360 30,432 35,504 40,576 45,648 50,720 55,792 60,864
<br /> *NOTE : 1) Ultimate Capacity(Q„) =Installation Torque (T)x Torque Correlation Factor(K,).
<br /> M2) Capacities shown in table assumes the pile is fully braced and has no eccentric loading.
<br /> 3)A safety factor of 2 should be applied to the ultimate capacity to obtain the working load capacity.
<br /> 4) Torque rating for 2 318"pile is 4,000 ft-lbs (1,380 psi).
<br /> 5)Torque ratingfor 2 7/8"pile is 8,200 ft-lbs (2,830 psi).
<br /> 6)Manufacturer recommendation not to exceed 2,500 PSI.
<br /> Cool and Cobb Engineering Co.
<br /> 8/13/2020 203 W.Main St.
<br /> Carl E.Cool,P.E. Avon Park,FL 33825
<br /> PE#16921
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