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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 hydrostatic 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).
Note 1: The longitudinal (axial) tensile loading by hydrostatic internal pressure is achieved by using means to create axial stress as the maximum principal stress over the hoop stress in the assemblies. The external hoop expansion restraint or specific test piece design is used for this purpose[1,2].
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