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 coupled pipe assembly having a pair of opposed, axially-positioned pipes each having opposed beveled ends and interior corrosion-resistant linings. A sleeve having heat-deflecting material is provided axially within the pipes with the heat-deflecting material being positioned adjacent the opposed pipe ends to protect the corrosion-resistant linings from heat damage during welding of the pipe ends. The sleeve has a tapered cross-section extending to and forming a rounded end edge portion.

Abstract: A replacement pipe section for a defective pipeline that includes two tubular members telescopically assembled so that the assembly has an adjustable overall length. The replacement pipe section includes a collar that can be disposed around and attached to both tubular members, thereby fixing the overall length of the assembly. The ends of the replacement section can then be attached to the fixed open ends of the pipeline to create a fluid-tight assembly. The replacement pipe section is particularly effective for permanently replacing a defective section of an internally coated pipeline.

Abstract: A coupled pipe assembly having a pair of opposed, axially positioned pipes each having opposed beveled ends and interior corrosion-resistant linings. A sleeve having heat-insulating material is inserted axially within the pipes with the heat-insulating material being positioned adjacent the opposed pipe ends to protect the corrosion-resistant linings from heat produced during the welding of the pipe ends. The sleeve has a uniform, continuous diameter along the entire length thereof.