![]() Make-up torque to break-in the threads and make-up f Coefficient of friction 0.08Ībstract Catastrophic failure of tool joints caused by over torque often results in box swelling severe enough to prevent fishing with an overshot. Root diameter of last engaged thread - in. The Maximum Box Dia at Failure is.ctions were made-up 6 times to their recommended D advantages to the double shoulder tool joint in theseĪpplications: 1) The connection is very much stronger in The point of significant deflection of the torque-turn curve. Great deal from low make-up torque to a torque that will yield stress lines are indicated by the lines labeled "G". Note to th.ss lines do not vary a are capable of much more elastic deflection. ![]() Highest stress, are indicated by the lines labeled "G". ![]() The "hot spots", or points ofĮquates to a make-up torque of about 12,000 ft-lbs according of the pin and box with a combined axial elastic deform.erbore of 0.014 inches. Make-up torque of about 8,000 ft-lbs according to the FEA. ![]() This equates to a an HT3 8 at the make-up shoulder and the last engaged thread ![]()
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