Assembly: Methods

High quality Polyethylene Pipes & HDPE Pipes technical guidance
What is electrofusion?Sunday 08 February 2009

Electrofusion is a simple method of joining PE pipes in circumstances where butt fusion is not practicable, such as where valves, elbows, and tees must be added. Prefabricated fittings are used,...

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What is butt fusion (hdpe welding) ?Sunday 08 February 2009

Butt fusion is a thermofusion process Butt fusion involves the simultaneous heating of the ends of two pipe/fitting components which are to be joined, until a molten state is attained on each contact...

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What is mechanical assembly?Sunday 08 February 2009

Mechanical assembly requires the use of fittings, generally working on the compression principle, to join different materials together. It is most commonly used with PE for joining the PE to a pipe...

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What methods can be used to assemble a PE pipe network?Sunday 08 February 2009

PE pipe can be assembled into a pipeline network by means of fusion or mechanical assembly techniques. Fusion of PE pipe and fittings may be by either Butt Fusion or Electrofusion. Other techniques...

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Under what circumstances are the different methods used?Sunday 08 February 2009

Butt fusion Butt fusion can be used for jointing pipes and fittings 63mm diameter and larger. However it is most commonly used for larger diameter pipes. Butt fusion jointing is equally suited to...

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What special equipment is needed for each assembly method?Sunday 08 February 2009

Butt fusion To ensure that good quality butt fusion joints are made it is essential that the correct equipment is used. The equipment used must be robust enough to handle the size and weight of the...

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Can different grades of PE be connected to each other?Sunday 08 February 2009

Butt fusion It is possible to butt fuse pipes and fittings of different grades and SDR, but this should only be carried out under controlled conditions. In case of doubt please contact the pipe and...

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Are there any standards or codes of practice applicable to the assembly methods?Sunday 08 February 2009

The major users of PE piping systems have developed codes of practice for fusion assembly. Many of these have become national standards. Butt fusion Butt fusion procedures require the application of...

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What training is necessary for operatives to assemble PE pipe networks?Sunday 08 February 2009

A fusion operator badge is required for all personnel involved in fusion techniques during the construction of PE gas networks. This badge must conform with ISO 12176 Part 3, and is granted after...

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How can I verify that the correct assembly procedures have been followed?Sunday 08 February 2009

Traceability is an integral part of modern, sophisticated, Quality Assurance systems used for PE pipe networks. The systems available, and mandatory at many end-users, enable tracing through the...

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What procedures are used for testing the assembly?Sunday 08 February 2009

Different methods of testing finished fusion joints in PE pipes have been developed in different European countries. They vary in their fundamental approach to the question of how a joint should be...

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