NBN ISO 8639:2021

This International Standard specifies test methods for flexible non-thrust resistant socket-and-spigot
joints with elastomeric sealing elements for buried and above ground glass-reinforced thermosetting
plastics (GRP) pipeline applications. It covers methods of test for the leaktightness and resistance to
damage of the joint only, when subject to specified combinations of longitudinal extension (draw),
angular movement (angular deflection), compression (deformation) perpendicular to the pipe axis
and internal pressure. This International Standard is applicable to joints for either pressure or non-
pressure applications.
NOTE The joints tested in accordance with this International Standard are subjected to conditions which
measure their ability to function and thereby prove the design of the joint, especially for type test purposes.
These test procedures are applicable to joints for pipes and fittings of all nominal sizes. The tests
are suitable for the evaluation of joints intended for applications in which the liquids are conveyed at
temperatures specified in the referring standards.
The test procedures in this International Standard are damaging to the test piece which will not be
suitable for reuse after these tests. The test procedure shall be applied for type testing purposes.