Threaded joint for pipes

Details Threaded joint for pipes Threaded joint for pipes

2005-10-25

2005-10-25

Hewitt, James M. (Department: 3679)

Pipe joints or couplings

Particular interface

Tapered

C285S334000, C285S390000, C285S917000

Reexamination Certificate

active

06957834

ABSTRACT:
A threaded joint which economically imparts effective sealing properties to a metal-to-metal seal portion and which can prevent seizing at the time of make-up comprises a steel pipe1having at its tip a male thread1band an unthreaded sealing surface1a, and a coupling2having on its inner surface a female thread2band an unthreaded sealing surface2a. With the yield pressure of the inner surface of the pipe being Py, (1) the average pressure Pm of the annular contact portion satisfies Pm/Py≧3, and the width in the axial direction of the portion which receives a pressure Ps which satisfies Ps/Py≧1 in the annular contact portion is at least 1 mm (or at least 2 mm), and the surface roughness Ry of both unthreaded sealing surfaces is at most 25 μm (or at most 30 μm), or (2) the relationship between the average pressure Pm of the annular contact portion and the surface roughness Ry (μm) of the unthreaded sealing surface satisfies Pm/Py≧0.0032×Ry2+1.0, and the width in the axial direction of the portion which receives a pressure Ps which satisfies Ps/Py≧1 in the annular contact portion is at least 1 mm.

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