Plastic Pipes Conference Association # 2023 Lake Buena Vista
Ernst van der Stok, Mirko Wenzel, Thomas Kratochvilla, Kurt Engelsing, Werner Weßing, Britta Gerets
It has not been possible to derive an accelerated procedure for the Point Load Test (PLT) as a pipe test before now. Further research and testing were therefore needed to establish appropriate requirements for standards including EN 1555-1 to rule out uncertainty in the market. The PLT is a central product test for the user. The damage mechanism that arises in this test is close to real damage patterns observed in practice. This means there is a need for a reproducible and accelerated PLT as an application-related component test for the qualification of pipes made of PE 100-RC.
This paper describes the work carried out by three research laboratories to develop an accelerated point load test. It explains that the results of the conventional, non-accelerated point load test with Arkopal® N100 at 80 °C and 4 MPa show little scatter within the results of each laboratory. Proposals to minimize the scatter have been drafted and incorporated into the latest version of the ISO test standard (ISO/CD 22102:2020).
Tests carried out with alternative detergents at 90 °C and 4 MPa on two PE 100 grades showed either a failure outside the point load range or no acceleration compared to Arkopal® N100. The point load test is intended to simulate a rock pressing into a pipe. Failure at the point load is therefore required to ensure that the correct failure mechanism has been investigated. Additional tests were therefore carried out at 80 °C and 4 MPa. These led to failure in the point load range for at least one chosen detergent (Disponil® LDBS 25).
Despite the work of the three research laboratories, the failure behavior in the point load test proves to be very complex. Further research activities could address the choice of detergent, especially in the context of the problematic availability of Arkopal® N100, and/or how to force the failure to appear in the point load range.
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