Steel pipe with integrally formed liner and method of...

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

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F16L 9/147 (2006.01) B32B 1/08 (2006.01) F16L 9/16 (2006.01) F16L 11/16 (2006.01) F16L 58/10 (2006.01)

Patent

CA 2225854

A metal pipe (11) and method of forming the same with an integrally formed liner for use in corrosive and abrasive environments utilizes a liner formed of a comparatively thick polymer (16) which is thermally bonded to the metal pipe (11). An intermediate polymer/adhesive layer (80) is applied to the metal pipe (11) to facilitate thermal/chemical bonding. The intermediate layer (80) is preferably applied to the sheet metal (11) in a pre-treatment process prior to roll forming the ribs (12) into the sheet metal (11). The polyethylene liner (16) is applied after the pipe has been formed, to provide a smooth, hydraulically efficient surface which is resistant to the corrosive action of sulfuric acid and the like encountered in sanitary applications, as well as abrasion caused by the flow of water-born debris such as dirt and gravel as is encountered in culvert applications.

L'invention se rapporte à une conduite (11) en acier pourvue d'une gaine formée solidairement et à son mode de formation. La gaine est conçue pour un usage dans des milieux corrosifs et abrasifs et est constituée d'un polymère relativement épais (16) qui est collé à chaud à la conduite (11) en métal. On applique une couche de polymère/adhésif intermédiaire (80) à la conduite (11) en métal pour faciliter la liaison thermique/chimique. On applique la couche intermédiaire (80) à la tôle (11) de préférence lors d'un traitement préalable avant le profilage des nervures (12) dans la tôle. On applique la gaine de protection en polyéthylène (16) une fois que le tuyau a été profilé pour lui conférer une surface lisse, hydrauliquement efficace, pouvant résister à l'action corrosive de l'acide sulfurique et des autres acides de même type que l'on trouve dans les installations sanitaires, ainsi qu'à l'abrasion provoquée par l'écoulement de débris transportés par les eaux tels que la terre et le gravier comme on en trouve dans les installations de drainage.

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