Invertible liner for internal surfaces of fluid conveying pipes and the like

US5388616A · kind A · utility

Inventors

• Hans Muller · Steinheim, DE
• Hermann Suerbaum · Steinheim, DE

Key dates

• Filing date: Jul 21, 1994
• Grant date: Feb 14, 1995
• Expiry date: Jul 21, 2014

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16L55/1651
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An invertible tubular substrate of resin-permeated fibrous material is surrounded by an impermeable tubular film which, in turn, is surrounded by an impermeable tubular calibrating element. One end of the substrate is inserted into one end of a pipe which is to be lined from the inside, and the assembly of substrate, film and calibrating element is thereupon inverted into the pipe wherein the substrate is immediately adjacent the internal surface of the pipe and surrounds the film. The calibrating element is separable from the film and can be withdrawn from the interior of the inverted film by a flexible cord. The resin in the substrate sets upon inversion and maintains the inverted substrate in contact with the internal surface of the pipe.