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Liner Pulling and Folding Equipment2014-08-01

IP.com Disclosure Number: IPCOM000238153D
Publication Date: 2014-Aug-05
Document File: 2 page(s) / 104K

Publishing Venue

The IP.com Prior Art Database

Abstract

An improved method for manufacturing and installation of tubular composite liners for the purposes of pipeline rehabilitation has been devised. Presently, these liners are pulled through a co-extrusion die during manufacturing, the pulled again through a folding apparatus prior to installation. The invention described below combines the folding process directly into the manufacturing stage by redesigning the pulling mechanism to create a folding action on the liner.

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ABSTRACT

An improved method for manufacturing and installation of tubular composite liners for the purposes of pipeline rehabilitation has been devised.  Presently, these liners are pulled through a co-extrusion die during manufacturing, the pulled again through a folding apparatus prior to installation.  The invention described below combines the folding process directly into the manufacturing stage by redesigning the pulling mechanism to create a folding action on the liner. 

DISCLOSURE

Internal liners are used to rehabilitate corroded pipelines.  Conventional pipeline liner products are composed of thermoplastic materials which are highly corrosion resistant.  Recent improvements in the technology replace the thermoplastic design with a composite material.  Longitudinal reinforcements which benefit the installation length are incorporated into the liner with a co-extrusion process.  A pulling apparatus is often used to maintain the co-extrusion process and ensure alignment of the reinforcements along the axial direction.  The installation of these liners is performed by reducing the liner’s cross-sectional area and pulling it through the inside of the host pipe.  One way to perform this reduction in area is by folding the liner into a U-shape, which is then reformed into a cylindrical tube by pressurizing the internal volume. 

Figure 1.  Longitudinal and cross-sectional views of pulling + folding equipment (red) and liner material (blue).

The proposed inventi...