EN 15655:2009 – Ductile iron pipes, fittings and accessories – Internal polyurethane lining for pipes and fittings – Requirements and test methods

1 Scope
This European Standard defines the requirements and test methods applicable to factory applied internal polyurethane high duty corrosion protection of buried ductile iron pipes and fittings conforming to EN 545,EN 598 and EN 969 for use at permanent operating temperatures up to 45 °C.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 545, Ductile iron pipes, fittings, accessories and their joints for water pipelines — Requirements and test methods
EN 598:2007, Ductile iron pipes, fittings, accessories and their joints for sewerage applications — Requirements and test methods
EN 969, Ductile iron pipes, fittings, accessories and their joints for gas pipelines — Requirements and test methods
EN ISO 4624, Paints and varnishes — Pull-off test for adhesion (ISO 4624:2002)
ISO 62:2008, Plastics — Determination of water absorption
ISO 527–3:1995, Plastics — Determination of tensile properties – Part 3: Test conditions for films and sheets ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore hardness)
ISO 8501–1:2007, Representative photographic examples of the change of appearance imparted to steel when blast-cleaned with different abrasives
ISO 8503–1:1988, Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ductile iron
cast iron used for pipes, fittings and accessories in which graphite is present substantially in spheroidal form
3.2
adhesion
force per unit area, applied perpendicular to the surface, which is necessary to separate the lining from its substrate
3.3
indirect impact strength
impact energy applied from outside of the pipe with deformation to which a lining can withstand without damage under defined test conditions
3.4
hardness
resistance of the lining to the penetration of a ball under defined test conditions
3.5
minimum lining thickness
lower limit calculated for the polyurethane lining thickness by the mean value (x) minus two times the standard
deviation ( σ )
3.6
non porosity
absence of holidays in a high voltage test under defined test conditions
3.7
polyurethane lining
factory applied lining which consists of polyurethane on the inside of the pipe or fitting
EN 15655:2009 – Ductile iron pipes, fittings and accessories – Internal polyurethane lining for pipes and fittings – Requirements and test methods