Pre-qualification of pipe conduits

Pre-qualification of pipe conduits

Norner helps protecting the homes of our customers, reducing failures and saving costs.

We offer a specified test scheme for pre-qualification of pipe conduits for pipe-in-pipe systems.

When installing water distribution in domestic houses and apartments, the PEX supply pipe will be covered by a corrugated pipe, often called a Pipe in Pipe system.

The inner pipe is a PEX plastic pipe with very stringent regulations. The outer corrugated sleeve has a security function of leading away potential leaking water, if the PEX pipe gets a rupture. These tubes had no regulations until recently, and due to quality variations and problems of the tubes it has resulted in cracking tubes and several insurance claims.

Testing methods

A new test scheme, Sintef Byggforsk “Test method for pipe in pipe systems, for approval", has been implemented in Norway and includes the analysis of several quality parameters:

  • Pigment dispersion and homogeneity
  • Raw material quality vs. gels
  • Thickness distribution of the profile
  • Presence of notches in the tube profile
  • Stress-crack resistance
  • UV testing

Norner offers pre-qualification according to the above mentioned tests of the pipe-in-pipe systems. Qualified systems have to be sent to Sintef Byggforsk to obtain a Sintef technical approval.


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