Hot water supply systems – compression fittings for plastic pipes: Tightness (NT VVS 011)

  • Report #: NT VVS 011
  • Approved: June 1981
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  This NORDTEST method specifies a test method to check whether or not joints between unions and pipes are watertight when subjected to temperature changes with and without tension in the joints, such as, bending, water hammering etc which occur in water pipes.