TOKYO GAS TOP > Technical development > Toward the safe and secure supply of energy > FLEX Liner Method for Dealing with Aged Pipes

FLEX Liner Method for Dealing with Aged Pipes

The FLEX Liner Method is a method which is used for dealing with gas pipes which have been buried for a long period of time. The method is environmentally friendly and economical, cutting down on the amount of excavated soil and waste material produced as well as time required.
 

FLEX Liner Method


The FLEX Liner Method is a method for inserting new PE pipe inside of gas pipes which have been buried for a long period of time aged pipes.

 

Outline

  1. PE Pipe Insertion Process
After being heated by a pipe warmer, the PE pipe is pulled through the pipe using a winch. During this process, a deformer is used to give the tube a "U" shape.
 
PE Pipe Insertion ProcessPE pipe during insertion
 
 
  1. PE Pipe Inflation Proces
Steam is used for heating and pressurization of the PE pipe to inflate it to its original shape. Cooling air is then blown through it.
 
PE Pipe Inflation  ProcessPE pipe restored to original shape
 

Features

This method renews aged pipes using PE pipes offering superior earthquake and corrosion resistance. Because PE is able to accommodate multiple bent pipes, this method perfoms  well when used for gas pipes  in a dense and complicated urban environment.

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