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Butt fusion cooling times, speeding up the process



Plastic Pipes Conference Association # 2010 Vancouver

Ted Striplin

The polyethylene (PE) pipe system has many attributes that make it the most reliable and highest quality system within the prescribed pressure and temperature limitations. However, the process itself is the weakest link in the PE pipe sales chain. While easier to join in large diameters, it can require the most time to install. Long cooling times can make it more difficult to sell a PE system. With the introduction of ISO 21307, there was a new answer to this problem for the rest of the world. The rest of the world because the USA and some other countries have been using this procedure for may years. Using the higher interfacial pressures proved to speed up the cooling time so that a strong safe joint can be removed the machine without taking any undue risk in weld failure in the near or long term. Now there is an amendment to ISO 21307 in he works with a revision to follow. The question is, can cooling times be shortened without compromising joint quality. We review testing of fusion jointing done using various Standards and correlate cooling times recommended with actual joint temperature at the completion of time in the machine under pressure. We can then determine if current standards have adequate cooling times or wasting valuable time needlessly.

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Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellORLEN UnipetrolPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE