Pipe thread joint

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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Details

F16L 15/00 (2006.01)

Patent

CA 2452426

A threaded joint which economically imparts effective sealing properties to a metal-to-metal seal portion and which can prevent galling at the time of make- up comprises a steel pipe 1 having at its tip a male thread 1b and an unthreaded sealing surface 1a, and a coupling 2 having on its inner surface a female thread 2b and an unthreaded sealing surface 2a. 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 x 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.

La présente invention concerne un joint pour filetage capable de conférer, à peu de frais, une étanchéité efficace à la section d'étanchéité de contact d'une surface métallique et d'empêcher le grippage au cours de la fixation, lequel joint est réalisé par assemblage d'un tuyau d'acier (1) possédant un filetage mâle (1b) à une extrémité et une surface d'étanchéité non filetée (2b) avec un raccord (2) possédant un filetage femelle (2b) sur sa surface périphérique interne et une surface d'étanchéité non filetée (2a). Dans le joint pour filetage de l'invention, si Py est la pression de rendement de la surface interne du tuyau, soit : (1) la pression de surface moyenne Pm de la partie de contact annulaire correspond à Pm/Py >/= 3, la largeur axiale de la partie qui reçoit la pression de surface Ps correspondant à Ps/Py >/= 1 dans la partie de contact annulaire est d'au moins 1 mm (ou d'au moins 2 mm), et la rugosité de surface (Ry) de la surface d'étanchéité non filetée est inférieure ou égale à 25 mu m (ou inférieure ou égale à 30 mu m) ; ou (2) la relation entre la pression de surface moyenne Pm de la partie de contact annulaire et la rugosité de surface (Ry) ( mu m) de la surface d'étanchéité non filetée correspond à Pm/Py >/= 0,0032 x Ry<2> + 1,0, et dans la partie de contact annulaire, la largeur axiale de la partie qui reçoit la pression de surface Ps correspondant à Ps/Py >/= 1 est supérieure ou égale à 1 mm.

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