Threaded joint for pipes

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

Patent

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Details

F16L 15/04 (2006.01) B05D 7/24 (2006.01) C09D 5/08 (2006.01) C09D 201/00 (2006.01)

Patent

CA 2706770

In a threaded joint for pipes constituted by a pin and a box, each having a contact surface comprising a threaded portion and an unthreaded metal contact portion, the contact surface of the pin has a solid corrosion protective, preferably transparent coating based on a UV-curable resin and the contact surface of the box has a solid lubricating coating having plastic or viscoplastic rheological behavior which is preferably formed by the hot melt technique from a composition comprising a thermoplastic polymer, a wax, a metal soap, a corrosion inhibitor, a water-insoluble liquid resin, and a solid lubricant.

L'invention concerne un raccord fileté pour tuyau constitué par une partie mâle et une partie femelle ayant chacune une surface de contact ayant une partie filetée et une partie de contact mécanique exempt de filetage. Un film de revêtement anticorrosion solide, qui est réalisé principalement en une résine durcie aux ultraviolets, et est, de préférence, transparent, est formé sur la surface de contact de la partie mâle. Un film de revêtement de lubrification solide, présentant un compartiment rhéologique plastique ou viscoplastique, est formé sur la surface de contact de la partie femelle, de préférence à partir d'une composition comprenant un polymère thermoplastique, une cire, un savon métallique, un inhibiteur de la corrosion, une résine liquide non soluble dans l'eau et un lubrifiant solide, par le procédé de thermofusion.

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