Abstract: A composite conduit suitable for transporting corrosive and/or erosive fluids including gases, liquids or slurries, is formed by positioning a tube formed of a material having desirable corrosion and/or erosion resistant properties within a pipe formed of a commonly weldable material such that one end of the tube is aligned with one end of the pipe. The tube has an outer diameter slightly less than the inner diameter of the pipe. The tube is affixed to the pipe by connecting the aligned ends thereof, and the pipe is compressed in a reducing operation so that the inner diameter of the pipe is reduced to a diameter that is less than or equal to the outer diameter of the tube. Adjacent, end-to-end sections of the composite conduit are connected using a coupling that employs a cylindrical body formed of the same material as the tubes of the conduits.

Abstract: An adjustable pipe connector for joining ends of lined pipe where corrosive or erosive gases, fluids or slurries may flow to provide a continuous corrosion barrier between the ends of adjacent pipe liners. The connector provides a telescoping arrangement of sleeves that may be adjusted in length to meet the needs of the pipes being welded. The connector also provides heat shielded weld points for welding to the pipe ends to ensure that the integrity of the pipe coatings is maintained.

Abstract: A corrosion resistant sleeve joining abutted ends of lined pipe where corrosive or erosive gases, fluids or slurries may flow to provide a continuous corrosion barrier between the ends of adjacent pipe liners. The sleeve is preferably a cylindrical member having sufficient length to allow disposition of a protective material, such as biocide, corrosion inhibitor, or combination thereof between the sleeve and the pipe surrounding the sleeve. The elongated cylindrical section may provide a double set of O-rings separated by a distance that would allow an annular recess to be placed between them for disposing a protective material. The protective material is preferably soluble with any fluid material that is to be transported through the pipe and blends with any fluid that permeates the outer most O-ring and comes into contact with the protective material.

Abstract: A connection joining abutted ends of pipe includes a sleeve therein which provides a continuous seal to protect the juncture of the pipe ends and the interior portions of the pipe adjacent the pipe ends from the materials passing through the pipe. The sleeve may be configured from a non-metallic material, such as PTFE, and a plurality of seal rings may be located on the outer circumference thereof to seal the sleeve to the interior surface of the pipe. The non-metallic sleeve is inherently non-corrosive, and therefore no secondary protective coatings need be provided on the interior surfaces of the pipe connection to protect the weld. To position the sleeve in the pipe ends, the sleeve may include a plurality of removable spacer pins thereon which are removed from the sleeve before the weld connection is completed. The sleeve may include circumferential end recesses forming a minor diameter end portion which is receivable in a tubular barrier material where the pipe includes an internal barrier material.

Abstract: A weld connection joining abutted ends of pipe includes a heat limiting sleeve therein which provides a continuous seal to protect the weld and the interior portions of the pipe from the materials passing through the pipe. The sleeve may be configured from a non-metallic material, such as PTFE, and a plurality of seal rings may be located on the outer circumference thereof to seal the sleeve to the interior surface of the pipe. The non-metallic sleeve is inherently non-corrosive, and therefore no secondary protective coatings need be provided on the interior surfaces of the pipe connection to protect the weld. To position the sleeve in the pipe ends, and to properly position the pipe ends for welding, the sleeve includes a plurality of removable spacer pins thereon which are removed from the sleeve before the weld connection is completed.