Abstract
The resistance of plastic (primarily polyethylene) pipe to rapid axial crack propagation under pressure is specified using the ISO 13477 ‘S4’ (small-scale steady state) test method. Pipe performance in this test may be very sensitive to temperature under standard test conditions. There has recently been concern that the temperature conditioning of pipe specimens required by ISO 13477 may not be sufficiently precise. In order to compensate for an over-estimated increase in surface temperature between removal from the conditioning fluid and testing, some laboratories condition specimens well below the test temperature. Here, infra-red imaging data are used to calibrate a simple and conservative model for the evolution of surface temperature during this interval. The results broadly support the present specification for testing at 0 °C, and provide a more secure basis for conditioning of specimens to be tested at lower temperatures.
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