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These tools have been designed to restrict the flow of gas or water in a plastic pipe,
while a repair is carried out.
They squeeze the pipe down to a set amount, as defined in the Transco specification PL2.
When a repair to a gas or water pipe is required, but its location is remote from valves or where it would be too expensive to empty the pipe, the flow can be arrested by using squeeze off tools.
Built-in rotatable "check plates" protect the pipe from being damaged by over
compression. These plates comply with the Transco standards and restrict the gap to 80% of twice the wall thickness. i.e. the tool will squeeze down until the pipe walls touch, then a further 10% of the thickness of the wall.
For example, a 90mm SDR11 pipe will have a nominal wall thickness of 8.18mm, so the squeeze gap will be restricted to 13mm.
The squeeze off tool comprises two parallel bars that apply pressure to the outsides of the pipe.
The bars are moved together hydraulically, squeezing the pipe
material until a seal is formed where the upper and lower walls meet.
Where the pipe wall is compressed the PE pipe will be severely deformed. In the areas of maximum compression, PE100 pipe will discolour due to stress whitening.
The pipe will eventually regain its original shape after the squeeze off tool has been released, but to speed up this process rerounding tools are available.
Individual gas companies may limit the maximum diameter of pipe that can be squeezed off and may require the use of stainless steel reinforcement bands above certain diameters.
Some locally enforced operating procedures require the use of squeeze off tools in pairs.
A primary and secondary, backup tool. This will require four tools to be used to repair a break in a pipe.
while a repair is carried out.
They squeeze the pipe down to a set amount, as defined in the Transco specification PL2.
When a repair to a gas or water pipe is required, but its location is remote from valves or where it would be too expensive to empty the pipe, the flow can be arrested by using squeeze off tools.
Built-in rotatable "check plates" protect the pipe from being damaged by over
compression. These plates comply with the Transco standards and restrict the gap to 80% of twice the wall thickness. i.e. the tool will squeeze down until the pipe walls touch, then a further 10% of the thickness of the wall.
For example, a 90mm SDR11 pipe will have a nominal wall thickness of 8.18mm, so the squeeze gap will be restricted to 13mm.
The squeeze off tool comprises two parallel bars that apply pressure to the outsides of the pipe.
The bars are moved together hydraulically, squeezing the pipe
material until a seal is formed where the upper and lower walls meet.
Where the pipe wall is compressed the PE pipe will be severely deformed. In the areas of maximum compression, PE100 pipe will discolour due to stress whitening.
The pipe will eventually regain its original shape after the squeeze off tool has been released, but to speed up this process rerounding tools are available.
Individual gas companies may limit the maximum diameter of pipe that can be squeezed off and may require the use of stainless steel reinforcement bands above certain diameters.
Some locally enforced operating procedures require the use of squeeze off tools in pairs.
A primary and secondary, backup tool. This will require four tools to be used to repair a break in a pipe.