Date:2018-04-09 View:803 Tag:DIN 30670
refers to polyethylene coating on steel pipes and fittings -- Requirements and tests.
This standard stipulates the requirements for the three layer extruded polyethylene based coatings used by the factory, as well as the single-layer or multi-layer sintered polyethylene based coatings for corrosion prevention of steel pipes and fittings. The coating is suitable for protecting embedded or immersed steel pipes at the design temperature of -40 to C +80 to C. This standard specifies the coating requirements for seamless steel tubes and fittings for pipeline construction for longitudinal or DSAW pipes or for transporting liquids or gases. 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 the international standard requirements for the three tier extruded polyethylene and polypropylene based coatings for oil and gas pipeline transportation systems. DIN EN ISO 21809-1 does not include the following application areas: - all polyethylene based coatings for pipes and accessories for transporting and distributing water and wastewater - all polyethylene based coatings for steel pipes and accessories for gas and liquid medium distribution pipes - single-layer and multi-layer burning for pipes and fittings of transport pipes and distribution pipes The standard for polyethylene coating is applicable to the above application areas. Two layers of polyethylene based coatings have been standardized in Europe in the DIN EN 10288 standard released in December 2003.
The material should be chosen by the coating machine itself, because according to the installation and coating procedures, various materials can be used to meet the minimum requirements for the finished coating specified in this standard. Buyer should agree to any deviation from material use. The surface should be cleaned by sand blasting. Jet cleaning and any necessary follow-up work should not lead to the reduction of minimum wall thickness specified in the standard of steel pipe technology delivery. The remaining debris should be removed before the coating is coated.