Pipe liner

Details Pipe liner Pipe liner

1999-02-18

2003-10-21

Barrett, Suzanne Dino (Department: 3676)

Pipe joints or couplings

With casing, lining or protector

Lined

C285S003000, C138S097000, C138S089000

Reexamination Certificate

active

06634675

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a pipe liner configuration.
DISCUSSION OF THE BACKGROUND
In pipeline refurbishing (e.g. gas pipes) it is known to run a plastic liner pipe through an existing steel pipe. However there can be problems with insertion due to bends and other partial obstructions to the passage of the liner pipe.
SUMMARY OF THE INVENTION
According to the invention there is provided a liner pipe for lining an existing pipe comprising a first elongate portion of plastics material and including a second portion extending from the first portion and having a flexibility substantially greater than the first portion to assist in insertion through an existing pipe.
The second portion is preferably of corrugated construction.
The second portion preferably terminates in nose-cone configured to enable a seal to be formed between the liner pipe and the existing pipe and provided with stopper means temporarily to prevent fluid flow into the liner pipe.


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