Threaded Joint For Steel Pipes

Abstract: This threaded joint comprises a pin (10) and a box (20). The pin (10) and box (20) fastened together comprise a threaded portion (101), an interior seal portion (102), and an exterior seal portion (103). A value Lth of the ratio of the amount of interference dth of the threaded portion (101) to tan (?th) when the slope angle of the threaded portion (101) is ?th, a value Lint of the ratio of the amount of interference dint of the interior seal portion (102) to tan(?int), when the slope angle of the interior seal portion (102) is ?int, and a value Lext of the ratio of the amount of interference dext of the exterior seal portion (103) to tan(?ext), when the slope angle of the exterior seal portion (103) is ?ext, satisfy condition (1) or condition (2) below. Lth > Lext and Lint ? Lth (1); Lth > Lint and Lext ? Lth (2)

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents