For the safe and reliable use of plastic and composite piping systems, it is essential to accurately assess their structural integrity. This includes evaluating how pipes and joints behave under axial tensile loading, which can occur during installation (e.g., pulling, laying) or in service due to sustained pressure, thermal effects, or ground movement. At present, ISO is developing standards for the short-term (ISO/CD 19521-1) and long-term (ISO/CD 19521-2) HAT tests.
