Threaded connection for internally clad pipe

Details Threaded connection for internally clad pipe Threaded connection for internally clad pipe

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 9/14 (2006.01) E21B 17/042 (2006.01) E21B 17/08 (2006.01) F16L 15/00 (2006.01) F16L 15/08 (2006.01) F16L 58/18 (2006.01)

Patent

CA 2322441

A corrosion-resistant threaded connection including a first tubular member having an outer metal tube (12) of corrosion-prone material and an inner metal lining (38) of corrosion-resistant material, the first tubular member (12) forming a pin connection (12a) having a nose portion comprising a ring (40) of corrosion-resistant material secured, e.g., welded (42), to the tube (12) of corrosion-prone material, a radially outwardly facing, annularly extending thread-free first pin shoulder (44) being formed on the corrosion-resistant ring, the first member including an externally threaded portion (48) providing male threads, and a second tubular member (14) comprising a metal coupling having a first end (16) and a second end (20) and forming a first box connection and a second box connection, respectively, the coupling including an internally disposed annularly extending metal section of corrosion-resistant material (24) disposed intermediate the ends (16, 20) of the coupling, each of the box connections comprising a radially inwardly facing annularly extending box shoulder (28) formed on the section of corrosion-resistant material (24).

On décrit un assemblage fileté anticorrosion, qui comprend un premier élément tubulaire présentant un tube métallique externe (12) oxydable et un revêtement métallique interne (38) inoxydable. Le premier élément tubulaire (12) forme un premier accouplement à broches (12a) comprenant une section avant munie d'un anneau (40) inoxydable fixé (par soudage (42), par exemple) au tube métallique (12) oxydable. Un premier épaulement mâle (44) annulaire non fileté orienté radialement vers l'extérieur est formé sur l'anneau inoxydable. Le premier élément inclut une partie (48) munie d'un filetage extérieur et présentant un filetage mâle. L'assemblage fileté comprend un deuxième élément tubulaire comprenant un raccord métallique muni d'une première extrémité (16) et d'une deuxième extrémité (20) et formant un premier raccordement femelle et un deuxième raccordement femelle, respectivement, le raccord incluant une section métallique annulaire (24) interne inoxydable délimitée par les extrémités (16, 20) du raccord. Chaque raccordement femelle comprend un épaulement femelle (28) annulaire orienté radialement vers l'intérieur et formé sur la section métallique (24) inoxydable.

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