DIN30670PolyethyleneCoatingforSteelPipesandFittings参考技术资料

UDC621.643.2-034.14:621.643.06-034.14:620.197.6-036742.2DEUTSCHE NORMApril 1991Polyethylene coatings forsteel pipes and fittingsD瓜Requirements and testing30670Umhullung von Stahlrohren und-formstucken mit PolyethylenSupersedes July 1980 edition.In keeping with current practice in standards published by the International Organization for Standardization (ISO),a commahas been used throughout as the decimal marker.This standard has been prepared jointly by DIN Deutsches Institut fur Normung e.V.and DVGW Deutscher Verein des Gas-und Wasserfaches e.V.(German Gas and Water Engineers'Association).The Standard has been adopted into the DVGWCodes of practice on gas and water.Dimensions in mmContentsPagePage1 Scope and field of application....................14.25 ldentation hardness...........................22Concepts......................4.26 Percentage elongation at failure.........22.1Indentation hardness ...........................14.27 Coating resistivity22.2 Light ageing ..................................14.28 Heat ageing...................................22.3 Minimum coating thickness14.29 Light ageing ................................22.4Continuity...................................5 Testing ...........................................44店2.5Percentage elongation at failure.................15.1 General,,,,,…2.6Bond strength ................................15.2Inspection documents..........................42.7Impact strength....…5.3 Procedure .........422.8Coating resistivity .............................5.3.1.Coating thickness444444。，。。。。。。。。。。。。。，。。，442.9Heat ageing ..................................25.3.2 Continuity.…43 Designation.…5.3.3 Bond strength ...............................25.8.4 Impact strength .............................4Requirements..…2g5.3.5 Indentation hardness..........................44.1 Requirements for substrate25.3.64.2 Requirements for coatingPercentage elongation at failure...............45.3.7 Coating resistivity.............................4.2.1 Minimum thickness ..........................25.3.8 Heat ageing...................................54.2.2 Continuity25.3.9 Light ageing...............................54.2.3 Bond strength ............................、26 Marking…4.2.4Impact strength2Standards refemed to...............................61 Scope and field of applicationlaboratory apparatus at a given irradiance,combined withThis standard specifies requirements for and methods ofperiodic wetting.testing extruded and fused polyethylene coatings applied atthe works to DIN 2448 or DIN 2458 steel pipes that will be in2.3 Minimum coating thicknesscontact with soil or water.It is intended to be used for qual-The minimum coating thickness is the required thickness ofity assurance purposes.When supplied with normal typecoatings at any point.9coatings(N).pipes in compliance with this standard are suit-able for continuous service temperatures of up to 50C,andwith special type coatings (S),for temperatures up to 70C.2.4 ContinuityFo