DIN 30670 refers to the polyethylene coating on steel pipes and fittings - Requirements and testing.


This standard specifies the requirements of three-layer extruded polyethylene-based coatings for factory application, and single-layer or multi-layer sintered polyethylene-based coatings for corrosion protection of steel pipes and pipe fittings. The coating is suitable for protecting buried or immersed steel pipes at design temperatures ranging from - 40 C to + 80 C. This standard specifies the requirements for coatings for longitudinal or spiral welded or seamless steel pipes and fittings for transporting liquid or gas pipelines. The application of this standard ensures that PE coatings provide adequate protection against mechanical, thermal and chemical loads during operation, transportation, storage and installation. DIN EN ISO 21809-1 specifies international requirements for three-layer extruded polyethylene and polypropylene-based coatings for steel pipes used in oil and gas pipeline transportation systems. DIN EN ISO 21809-1 does not include the following application areas: all polyethylene-based coatings for steel pipes and fittings for water and wastewater transportation and distribution; all polyethylene-based coatings for steel pipes and fittings for distribution pipes in gaseous and liquid media; and single-layer and multi-layer sintered polyethylene-based coatings for steel pipes and fittings for transportation and distribution pipes. The field of use is still valid. Double-layer polyethylene-based coatings are standardized in Europe and published in DIN EN 10288 in December 2003.


Material shall be selected by the coating machine, since according to installation and coating procedures, various materials can be used to meet the minimum requirements of finished coatings specified in this standard. Buyers shall agree on any deviation from the material used. Surface should be cleaned by sand blasting. Sandblasting and any necessary follow-up work shall not result in a reduction in the minimum wall thickness specified in the technical delivery standards for steel pipes. Residual debris should be removed before coating.