Abstract: A method and apparatus for lining a pre-existing pipe or passage having at least one curved section or bend along its length with a pipe assembly (10) is disclosed. An assembly is formed from a plurality of pipe sections (11), having axial ends (15,16) which are inclined at non-orthogonal angles (x) with respect to the longitudinal axis of the sections, and having interengagement means, placed end-to-end and engaged together. The pipe assembly is advanced into the passage or pre-existing pipe, pipe sections being vibrated such that the relevant pipe sections rotate relative to one another towards a relative orientation in which the axes of adjacent pipe sections within a curved section of pre-existing pipe or passage lie inclined at an angle to one another such that the pipe assembly can be advanced through the pre-existing pipe or passage.

Abstract: A method and apparatus for lining a pre-existing pipe or passage having at least one curved section or bend along its length with a pipe assembly (10) is disclosed. An assembly is formed from a plurality of pipe sections (11), having axial ends (15,16) which are inclined at non-orthogonal angles (x) with respect to the longitudinal axis of the sections, and having interengagement means, placed end-to-end and engaged together The pipe assembly is advanced into the passage or pre-existing pipe, pipe sections being vibrated such that the relevant pipe sections rotate relative to one another towards a relative orientation in which the axes of adjacent pipe sections within a curved section of pre-existing pipe or passage lie inclined at an angle to one another such that the pipe assembly can be advanced through the pre-existing pipe or passage.

Abstract: A method of producing an injection-molded plastics article having a hollow interior, such as a pipe section comprising the steps of forming a mold cavity having outer dye parts and an inner mandrill to define an annular mold cavity. Then introducing plastics material into the mold cavity and delivering a pressurized fluid to the interface between the mandrill and the inner surface of the molded article through passages in the mandrill opening to the surface thereof, and withdrawing the mandrill while maintaining the outer dye parts in a closed condition. In addition, an apparatus for producing such hollow molded article, the hollow molded article itself, and a method of lining an aged, broken or damaged pre-existing pipeline are also described.