Contribution of the Plastic Pipe Industry to the PVC Voluntary Commitment

Author(s) : Lars Jacobsson, Hans Andersson and Linda Karlsson

Problems sometimes occur in tightness testing of plastic pipelines using pressurized water and accounting for the diametrical expansion, particularly so for larger sizes and higher pressure rating. Pipelines that are in fact tight enough for acceptance are rejected when first tested. A study consisting of two parts...

Author(s) : Lars Jacobsson, Hans Andersson, Daniel Vennetti and Sven-Erik Sällberg

Leakages are reported in flange joints of large pipelines for water supply although mounted according to recommended practise. FEM analyses and full scale experiments have been performed in order to better understand the functioning of the joints. The objectives were to find out about the sensitivity to mounting and...

Author(s) : Sven-Erik Sällberg, Kristian Thörnblom, Hans Sandberg

As trenchless installation techniques and coarse-grained backfill materials are gaining in interest for plastics pipelines, the influence from surface damage on the technical lifetime is becoming more and more important. For non-pressure applications, such as gravity sewers, this aspect is relevant, e.g., when...

Author(s) : Ulrich Schulte, Heinz Vogt, Hans-Friedrich Enderle, Dieter Lilge

The completion of a pressure test is mandatory for all new pipe systems. Its purpose is to demonstrate the overall leak-proof condition of the system. In the course of this test, HDPE pipes of SDR 17 class are exposed to high stress loads. In an extensive test programme, all failure mechanisms observed in long-term...