| 摘要 |
<p>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.</p> |
