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New regulation on multilayer systems

2-07-2011 | news | Pipes test

“The Specific Regulation of the AENOR RP 01.71 mark applicable to multilayer piping systems for hot and cold water installation inside buildings was published recently. This regulation uses standard UNE EN ISO 21003 as a reference document. It has four parts:

Part 1: General
Part 2: Pipes
Part 3: Fittings
Part 5: Fitness for purpose of the system.

These parts must be jointly applied so that the product complies with the mentioned regulation, thus guaranteeing the compatibility of all the elements of the system, whose capacity is determined by the behaviour of the pipe-fitting joints in its different formats.

These systems are made up of pipes and fittings in which the polymer materials used for the layers of the pipes may be polybutylene (PB) temperature proof polyethylene (PERT), cross linked polyethylene (PEX), polypropylene (PP) and vinyl chloride (PVC-C) and the fittings may be made of one of the materials mentioned or other plastics or metals.

With respect to the tests included in the series of standards of UNE EN ISO 21003, for whose execution CEIS is accredited in most of the cases, a distinction should be made between the separate tests to be conducted on the components of the system, pipe and fitting and those applicable to the system as a whole.

Tests applicable to pipes:

  • Aspect and dimension control
  • Opacity UNE-EN ISO 7686
  • Permeabilitiy to oxygen ISO 17455
  • Resistance to internal pressure UNE-EN ISO 1167
  • Thermal durability UNE-EN ISO 21003-2
  • Delamination UNE ISO 17454

Other tests would also be applied according to the material of the component:

  • Degree of reticulation UNE-EN 579
  • Melt flow index UNE-EN ISO 1133
  • Oxidation induction time UNE-EN 728
  • Intermediate layer features

Test applicable to fittings:

  • Aspect and dimensional control
  • Opacity UNE-EN ISO 7686

Other tests would also be applied according to the material of the component:

  • Melt flow index UNE-EN ISO 1133
  • Chemical composition

The applicable tests relating to the systems would be:

  • Resistance to internal pressure UNE-EN ISO 1167
  • Temperature cycles UNE-EN 12293: an installation of pipes and fittings is subject to temperature cycles, passing pressurised hot and cold water alternatively during a specified number of cycles. During and after the test, the installation is supervised to see possible signs of leakage.
  • Bending UNE-EN 713: Checking the leaktightness of mechanical joints at internal hydrostatic pressure when they are subject to bending.
  • Vacuum UNE-EN-12294: Checking the leaktightness of mechanical joints in vacuum conditions.
  • Resistance to pull out UNE-EN 712: Checking the behaviour of mechanical joints that are subject to a longitudinal traction force.
  • Pressure cycles UNE-EN 12295: A set of pipes and fittings, maintained at a specific temperature is subject to pressure cycles in air or water, between two positive pressure limits in water and a check is made for the absence of leaks.

Regression curves

One of the main novelties of standard UNE EN ISO 21003 and consequently of AENOR’s new certification system is the use of regression curves for the determination of the test conditions to which the samples are to be subject.

On 29th March CEIS organised a training session, given by our General Director and aimed at all those professionals who are involved in the use of the standards for multilayer piping systems. The course was designed with the main objective of being a guide for the calculation and interpretation of the regression curves as well as for the determination of the design pressures according to ISO 9080, by helping to understand the theoretical fundamentals of the curves, and going into depth on the practical aspects related to the tests required to evaluate the conformity of the systems.

In this manner, CEIS has contributed to spreading the advantages of the products which have been standardised, tested and certified in this field, by performing and interpreting the reference curves that guaranteed the durability and performance of the materials in the long term, without forgetting quality and efficiency in being able to construct high performance installations.

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