Polypropylene coatings on steel pipes and fittings - Requirements and testing
|Publication Date:||1 September 2013|
|ICS Code (Iron and steel pipes):||23.040.10|
This standard specifies requirements for factory-applied three-layer extruded polypropylene-based coatings, and one- or multi-layered sintered polypropylene-based coatings for the corrosion protection of steel pipes and fittings.
The present standard specifies requirements for coatings that are applied to longitudinally or spirally welded or seamless steel pipes and fittings used for the construction of pipelines for conveying liquids or gases.
Applying this standard ensures that the PP coating provides sufficient protection against the mechanical, thermal and chemical loads occurring during operation, transport, storage and installation.
DIN EN ISO 21809-1 specifies requirements at international level for three-layer extruded polypropylene- and polypropylene-based coatings for steel pipes for petroleum and natural gas pipeline transportation systems.
The following fields of application are not covered by DIN EN ISO 21809-1:
-all polypropylene-based coatings for steel pipes and fittings used for the conveyance and distribution of water and wastewater,
-all polypropylene-based coatings for steel pipes and fittings in distribution pipelines for gaseous and liquid media,
-single- and multi-layer sintered polypropylene-based coatings for steel pipes and fittings used for transport pipelines and distribution pipelines.
The present standard remains valid for the above fields of application.
The coatings are suitable for the protection of buried or submerged steel pipes at design temperatures of -20 ºC up to +110 ºC (see DIN EN ISO 21809-1:2011-10, Table 1). Special precautions in transport, handling and installation need to be taken for temperatures below 0 ºC. The purchaser shall specify temperature ranges below 0 ºC and above 90 ºC, as this could require adjustments to be made in the coating components