Liner for repairing a lateral connection of a pipeline

1. A liner for lining a connection between a main pipeline and a lateral pipe, said liner including

a main pipeline lining part that in use forms a tubular portion for lining an inner circumferential portion of the main pipeline and a lateral pipe lining part that in use forms a tubular portion for lining an inner circumferential portion of the lateral pipe,

wherein between the lateral pipe lining part and the main pipe lining part there is a transition zone that in use is arranged to line a junction zone between the main pipeline and the lateral pipe,

said transition zone of the liner being formed integrally with the main pipeline lining part and the lateral pipe lining part such that there is no circumferential join or seam, and wherein the liner is made from a single blank of material which is folded along a line of symmetry and then stitched or otherwise joined together adjacent to or along two edges to form connections establishing the main pipeline lining part and the lateral pipe lining part.

2. The liner according to claim 1 made from a resin absorbent material.

3. The liner according to claim 1 wherein the liner is made from a felt material or an elastomeric coated felt material.

4. The liner according to claim 3 wherein the felt material is made from polyester, polypropylene or glass fibre.

5. The liner of claim 1 wherein otherwise joining together the edges of the blank of material consists of gluing or welding the edges.

6. A liner for lining a connection between a main pipeline and a lateral pipe, said liner including

a main pipeline lining part that in use forms a tubular portion for lining an inner circumferential portion of the main pipeline and a lateral pipe lining part that in use forms a tubular portion for lining an inner circumferential portion of the lateral pipe,

wherein between the lateral pipe lining part and the main pipe lining part there is a transition zone that in use is arranged to line a junction zone between the main pipeline and the lateral pipe,

said transition zone of the liner being formed integrally with the main pipeline lining part and the lateral pipe lining part such that there is no circumferential join or seam; and

wherein the liner is made from two blanks of material which are placed together to overlap then stitched or otherwise joined together adjacent to or along three edges to form connections establishing the main pipeline lining part and the lateral pipe lining part.

7. A liner for lining a connection between a main pipeline and a lateral pipe, said liner comprising

a main pipeline lining part that in use forms a tubular portion for lining an inner circumferential portion of the main pipeline and a lateral pipe lining part that in use forms a tubular portion for lining an inner circumferential portion of the lateral pipe, and

a transition zone located between the lateral pipe lining part and the main pipe lining part of the liner, said transition zone arranged in use to line a junction zone between the main pipeline and the lateral pipe, said transition zone of the liner being formed integrally with the main pipeline lining part and the lateral pipe lining part of the liner such that there is no circumferential join or seam,

wherein the liner has a first shape prior to installation so that when the material of the liner is stretched during installation the liner has a second shape different than the first shape that is substantially the same as the inner circumferential shape of the connection; and wherein the liner is made from a single blank of material which is folded along a line of symmetry and then stitched or otherwise joined together adjacent to or along two edges to form connections establishing the main pipeline lining part and the lateral pipe lining part.

8. The liner according to claim 7 wherein the lateral pipe lining part of an as formed liner has a circumferential side wall that tapers outwardly as it extends away from the main pipeline lining part so that during installation of the liner in the connection, stretching of the material of the liner results in the tapered circumferential side wall of the lateral pipe lining part forming a tubular portion having a substantially parallel circumferential side wall.

9. The liner according to claim 7 wherein the different shape of the as formed liner is provided by a necked-in portion between the main pipeline lining part and the lateral pipe lining part of the liner.

10. The liner according to claim 7 wherein the shape of the initially formed liner is determined by including a stretch allowance of between about 10 and 100% in a transition zone of the liner located between the lateral pipe lining part and the main pipe lining part.

11. The liner according to claim 7 wherein the shape of the initially formed liner is determined by including a stretch allowance of between about 20 and 40% in a transition zone of the liner located between the lateral pipe lining part and the main pipe lining part.

12. A blank for forming a liner in accordance with claim 1 .

13. A cured lining within a connection between a main pipeline and a lateral pipe wherein the lining is formed using a liner in accordance with claim 1 .

14. A method of manufacturing a liner according to claim 1 , said method including the steps of assembling at least one blank so as to form a liner configuration and joining at least two edges of the liner configuration so as to form said liner.

15. A blank for forming a liner in accordance with claim 7 .

16. A cured lining within a connection between a main pipeline and a lateral pipe wherein the lining is formed using a liner in accordance with claim 7 .

17. A method of manufacturing a liner according to claim 7 , said method including the steps of assembling at least one blank so as to form a liner configuration and joining at least two edges of the liner configuration so as to form said liner.

18. A liner for lining a connection between a main pipeline and a lateral pipe, said liner comprising a main pipeline lining part that in use forms a tubular portion for lining an inner circumferential portion of the main pipeline and a lateral pipe lining part that in use forms a tubular portion for lining an inner circumferential portion of the lateral pipe, and

a transition zone located between the lateral pipe lining part and the main pipe lining part of the liner, said transition zone arranged in use to line a junction zone between the main pipeline and the lateral pipe, said transition zone of the liner being formed integrally with the main pipeline lining part and the lateral pipe lining part of the liner such that there is no circumferential join or seam,

wherein the liner has a first shape prior to installation so that when the material of the liner is stretched during installation the liner has a second shape different than the first shape that is substantially the same as the inner circumferential shape of the connection;

and wherein the liner is made from two blanks of material which are placed together to overlap then stitched or otherwise joined together adjacent to or along three edges to form connections establishing the main pipeline lining part and the lateral pipe lining part.