b'Design Example 7AMotor Output Torque Quick-Solve Design MethodDesign 1A: The heavy weight new construction P - Design Example 1B - 3-1/2 dia. shaft:piledesignpresentedinDesignExample1 P Design 1B=2,000 psi200 psi = 1,800 psispecified that when installed on the site, torsion Withtheactualfieldmeasuredpressureof 6,700ft-lbwasneededonthe2-7/8inchdiameterTorqueAnchorshafttoreachthe differentialscalculated,onecan findtheactualultimate capacity requirement of 60,000 pounds. installationmotortorque onGraph 2fromChapter 4. (shown below.) Locate 1,700 psi andDesign 1B: In Design Example 1B, weak soil 1,950psivaluesatthebottomofthegraph.waspresent and thetorsionrequirement Then read upward until the motor curve line forincreasedto 7,500ft-lbonthe3-1/2inch the X12K5 motor is reached.Read horizontallydiametertubularshafttoachievethesame totheleftwherethe OutputTorqueatthe60,000 pound ultimate pile capacity. Shaft can be found.Determine MotorOutputTorque:Graph 2 A. DesignExample1 OutputTorqueattheMotorOutputTorquevs.UltimateCapacity Shaft torsion is estimated at 6,750 ft-lb. (2-78introducedinChapter 4isusedtoconvert diameter shaft)pressure differential, P, at the hydraulic gear B. DesignExample1Bhadapressuremotor to shaft output torque.Referring to Graph differentialof1,950psi,which producedan2 (below); the output torque of the X12K5 motor Output Torque at Shaft estimated at 7,600 ft-lb.can be determined once the pressure differential (3-1/2 diameter shaft)across the installation motor is determined. Proper installation shaft torque is confirmed forP = Inlet psiOutlet psi = P =p inp out Design Examples 1 and 1BP for Design Example 12-7/8 dia. shaft: End Design Example 7A.P Design 1 = 1,800 psi - 200 psi = 1,600 psi PRO-DIG SINGLE SPEED GEAR MOTORS - DIFFERENTIAL PRESSUREAT MOTOR VS. MOTOR OUTPUT TORQUEPro-Dig L7K5 Pro-Dig X9K5 Pro-Dig X12K513,00012,00011,000Output Torque at Shaft (ft-lb)10,0009,0008,0007,0006,0005,0004,0003,0002,000 Earth Contact Products1,0005 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30Graph 2. Pressure Differential Across Motor x 100 (psi)Review of Results of Example 7 & 7AOne can see that the result obtained by the Quick-Solve design analysis suggested theshaft torsion from field data was sufficient to provide the required load capacity.The resultsweresimilarfromthecalculatedmethod,andfromthe Quick-Solve solution,fortheinstallation shaft torque at the motor.ECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 104 All rights reserved'