The reparation by electrofusión is the ideal solution for all those who some time we have found with the need of having to repair a pipe that has already been installed and buried (either due to a leak, a badly-performed welding…).

There have been many occasions in which placing a butt welding machine to make a reparation has been slow and awkward. Maybe it is needed to open a big space around the buried pipe to be able to place the machine and besides, even more space so that the worker has mobility and able to place the mirror, the removable electric facer… in the end, all of this takes us more time than the simple welding.

Instead, an electrofusion welding results much more simple, comfortable and fast to do.

How can we repair by electrofusion a pipe which has already been installed?

The steps are simple and they don’t require the need of great experience in this type of works:

  1. Open the trench around the area where we want to make the reparation.
  1. Cut the piece of the pipe which is in bad conditions.
  1. Clean and scratch the ends of the pipes.
  1. Place the electrofusion fittings in the ends of the pipes.
  1. Place the new pipe between the fittings.
  1. Place the aligners.
  1. Perform the welding.

 

OPENING OF THE TRENCH IN THE AREA WHERE IT IS REQUIERED THE REPARATION

This is the first step that must be performed is simply, you have to dig the area where you have to change this piece of pipe. It must be removed the earth… up to leaving the pipe completely free.

The hollow has to be enough so that one or two workers can work.

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PLACE THE PIECE OF PIPE THAT IS IN BAD CONDITIONS

To eliminate the leak, the crack… it must be cut the pipe through two ends leaving free the affected area. So in this way, it will be completely eliminated the affected area and will be two ends of the pipes where after placing the electrofusion fittings.

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CLEAN AND SCRATCH THE ENDS OF THE PIPES

Maybe it is one of the key steps in the welding, as if the area where you have to place the fitting to place the electrofusión welding is not well-cleaned, so it will be produced an incorrect welding.

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The first thing that you have to do is to clean the ends with some paper to eliminate any trace of dirt.

After using a scratcher for pipes, we have to scratch the area of the ends of the pipes where it will be place the fitting. This sis done to eliminate the layer of oxide that is produced due to the contact of the air…

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PLACING THE FITTIGNS IN THE ENDS OF THE PIPES

In this step, you have to be careful and you don’t have to touch with your hands the inner part of the fitting to avoid the pollution, any kind of dirt can make the electrofusion welding is useless.

Simply we will revise that the fitting is clean, and without removing completely the protector plastic, we will place it in the end of the pipe that we have previously scratched as we have explained in the previous step.

This step has to be performed twice, as a fitting has to be placed in each end of both pipes.

The fittings that are usually used for this type of works are black or blue for water supply and black or yellow for gas supply.

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PLACING A NEW PIPE BETWEEN THE FITTINGS

Now, you have to place a new pipe between both fittings that we have placed, this piece will substitute the section of the worn-out pipe which has been previously cut.

This new piece of pipe has to be cleaned and scratched on both ends, and this will make sure a good join when we perform the electrofusion welding.

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PLACING THE ALIGNERS

This step is very important, we must place the aligners to make sure that the pipes don’t have any type of movement and they are totally aligned during the welding. If we don’t get it, the welding will fail.

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PERFORMING THE WELDING

This step is performed by using an electrofusion welding machine, depending on the size of the pipe, it will be used a model or another.

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The process is simple, you have to disconnect the cable of the machine from the fitting and read the bar code with the optic pen or with bar code reader (depending on the machine), it is introduced automatically the welding parameters for this fitting, you only have to accept and the welding is automatic performed.

The parameters also can be manually introduced, as the machines incorporate a small keyboard for that.

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**When the welding ends, as you can disconnect the cables of the fittings and we wait a time to cool it to remove the aligners **.

In Arístegui Maquinaria we have a wide catalogue of machines and fittings to perform electrofusion weldings of our brand Advance Welding, you can find it in: http://bit.ly/1rtY9BR

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If it is interested for you, we leave you a link to another of our publications where we talk about the preparation previous performing the electrofusion welding.

>>> Electrofusion welding: method of preparation

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