Patent ID: 6467812
Filing Date: 2002-10-22
Classification: E04G,F16L

Abstract:
A pipe unit for releasable connection of one pipe member to a second pipe member in a concrete pumping line for carrying concrete, comprising:a steel pipe member having a hardened inner wall for carrying concrete, an outer body member secured to one end of said one pipe member and having an external circumferential coupling groove for receiving a coupler unit for interconnection of said one pipe member to said second pipe member, said body member and said one pipe member defining an inner recess extended outwardly of the pipe member, an insert liner having a tubular portion located within said substantially matching said inner recess, said insert liner having an outer locating and abrasive resistant end flange abutting the end of said body member, and an epoxy adhesive between said tubular portion and said recess and bonding said liner to said body member, said epoxy adhesive releasing said liner in response to heating said epoxy adhesive, said inert liner being a cast member of a wear resistance iron chrome alloy and providing a surface highly resistant to the abrasive force of concrete.