Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.

Italgas Experience on non destructive Evaluation of PE Pipe Welding [PE]


Plastic Pipes Conference Association # 2004 Milan

Ghia, Olivero, Piovano

Nowadays the major determinants for the evaluation of polyethylene (PE) pipe welding are still visual examination of weld bead quality (for butt fusion) and destructive tests. Nevertheless during the last decade a great effort has been done in studying and attempting the development of suitable Non Destructive Evaluation (NDE) methods to reliably assess the integrity of PE joints and ensure a long term operation life for thermoplastic welds. Goal of this contribution is to present the research activity carried out by Italgas in this field. Both XRays and ultrasonic techniques have been tested always finding out good results as far as standard flaws (such as inclusions and voids) are concerned and difficulties in the cold weld detection. In particular, as for ultrasonic analysis, both Pulse Echo and Pitch Catch techniques have been taken into consideration. Ultrasonic tests were accomplished on samples purposely prepared with different kinds of flaws, so as to reproduce all possible defects or weaknesses affecting field welds (gas and bulk inclusions, cold welds,…). Afterwards all the specimens have been subjected to Destructive Evaluation (DE) tests, executed in accordance with the international standard ISO 13953. Comparison between DE and NDE led to the aforementioned results. At present other promising techniques, such as time of flight diffraction and ultrasonic array approach, are under evaluation and preliminary results will be presented.

Please note that the whole article content is available on PPCA website only :

Related papers

2006 Washington DC : Comparison of Long-Term and Short-Term Tests for Electrofusion Joints in PE Pipes

Author(s) : Troughton, Brown, Hessel, Piovano

As part of the Polytec Systems European-funded project, electrofusion (EF) joints in polyethylene (PE) pipe, containing different flaws, have been subjected to various standard and non-standard, long-term and short-term, coupon and whole pipe tests. The results were compared to determine which tests could discriminate...

Members of the Association

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