EN 744 is superseeded by ISO 3127 the ineternational standard that specifies the procedure for conducting impact test, the round-the-clock-method on thermoplastics pipes. This test method is essential for evaluating the resistance of pipes to external blows or impacts during handling, transport, and installation. By following the EN 744 / ISO 3127 standard, manufacturers and testing laboratories can determine whether a pipe can withstand the mechanical stresses it may encounter in practical applications. The test involves dropping a striker of a specified mass from a specific height onto a horizontally supported pipe specimen. The number of impacts required in the round-the-clock-method and the observed effects, including possible cracks or breaks, are used to assess the impact resistance of the pipe material. This information is essential for confirming that the pipes meet minimum performance requirements and are suitable for their intended use in water supply, sewage, and other applications.
Carrying out the EN 744 / ISO 3127 impact test requires specialized equipment, including a striker, a drop apparatus, and supports for the pipe specimen. The weights of the striker, drop heights, and dimensions of the anvil supports are defined in the standard and must match the specifications for the pipe diameter and intended application. Test pipes are conditioned to a specified temperature, most commonly 0°C or 23°C, for a predetermined period before testing. A series of impacts are delivered along the length of each test specimen, and the results are carefully recorded. The assessment is based on the number of test pieces that develop cracks or breaks compared to the allowable statistical limit. If the number of failures exceeds the acceptable threshold, the batch of pipes does not meet the EN 744 / ISO 3127 requirements. This method provides a standardized approach for evaluating impact resistance and helps ensure product consistency and compliance with regulatory standards.
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