Pipe screw coupling
A technology for threaded joints and pipes, applied in the direction of threaded connections, pipes/pipe joints/pipes, drill pipes, etc., can solve problems such as mechanical damage of the threaded part, and achieve the effect of improving mechanical damage resistance
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[0071] As an example of the invention, evaluation was performed on a threaded joint for pipes according to the present invention, which is shown in FIG. 1(a) or in which any two arcs of the compound arc curve in FIG. 1(a) are connected via a line segment. . Table 1 and Table 2 show the dimensions, shapes and evaluation results of Examples of the present invention and Comparative Examples. The pin member is formed at the tip of a steel pipe with an outer diameter of 244.48 mm and a wall thickness of 13.84 mm. Also, the thread is formed with 5TPI (five threads per inch). As an evaluation based on FEM analysis, a leak test based on ISO13679:2002 was simulated, and the contact surface pressure (ksi·inch) at the sealed part of the test was evaluated. In addition, the contact surface pressure is calculated by integrating the contact surface pressure in the seal contact area. For this leak test, a pipe threaded joint is subjected to a biaxial stress corresponding to 95% of the yie...
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