ISO/NP 19251-2

Thermoplastic pipes for the conveyance of fluid — Hydro axial tension (HAT) test — Part 2: Stress rupture

Scope

This document specifies methods for testing the resistance to sustained longitudinal tensile loading (longitudinal stress-rupture) of uniaxial plastic pipe/pipe or pipe/fitting or fitting/fitting assemblies using hydraulic pressure at a given temperature. This document is applicable to pipe assemblies with electrofusion or butt fusion joints. The methods accommodate water-in-water, water-in-air, and liquid-in-liquid tests.
Method A uses no external hoop expansion restraint (specifically designed test piece).
Method B uses external hoop expansion restraint (metal end caps or circumferential (ring) clamps).