Patent ID: 8181998
Filing Date: 2012-05-22
Classification: F16L

Abstract:
1. A pipe connection having a box ( 1 ) with an internal thread ( 2 ) formed with a box thread lead ( 3 ) for mating with a pin ( 11 ) having an external thread ( 12 ) formed with a pin thread lead ( 13 ), the mating threads being sized for diametrical interference when assembled together, the pipe material having a Poisson's Ratio, comprising: The pin thread lead being made shorter than the box thread lead to substantially offset axial elongation of the pin thread and axial contraction of the box thread that occur in accord with Poisson's Ratio during assembly of the pin with the box, such that the mating thread leads are substantially equal when assembled; The difference in leads before assembly being substantially equal to the diametrical interference of the threads, divided by the mean thread diameter, multiplied by Poisson's Ratio, and divided by the number of threads per unit length.