1、April 2012 English price group 16No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.040.10; 23.040.40!$k“1909072www
2、.din.deDDIN 30670Polyethylene coatings on steel pipes and fittings Requirements and testing,English translation of DIN 30670:2012-04Polyethylen-Umhllungen von Rohren und Formstcken aus Stahl Anforderungen und Prfungen,Englische bersetzung von DIN 30670:2012-04Gainage du polythylne pour des tubes et
3、des pices ajustes dacier Exigences et essais,Traduction anglaise de DIN 30670:2012-04Together with supersedesDIN 30670:1991-04www.beuth.deDocument comprises 37 pagesDIN EN 10288:2003-12,01.13Translation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authorit
4、ative.DIN 30670:2012-04 2 Contents Page Foreword . 5 1 Scope . 7 2 Normative references . 7 3 Terms and definitions 8 4 Symbols and abbreviations . 9 5 Coating . 9 5.1 General . 9 5.2 Types of coating . 9 6 Information to be supplied by the purchaser 10 6.1 Mandatory information . 10 6.2 Order optio
5、ns 10 7 Application of the coating 10 7.1 General . 10 7.2 Surface preparation 10 7.3 Composition of the coating . 10 7.3.1 General . 10 7.3.2 Epoxy resin primer . 12 7.3.3 PE adhesive . 12 7.3.4 Polyethylene coating 12 7.3.5 Cutback 13 8 Requirements 13 8.1 General . 13 8.2 Material properties 13 8
6、.3 Production monitoring . 17 8.3.1 Surface preparation 17 8.3.2 Pipe coating . 17 9 Inspection and testing 18 9.1 General . 18 9.2 Inspection documents 18 9.3 Types and frequency of tests 18 10 Repairs . 21 11 Marking 21 12 Handling, transportation and storage. 21 Annex A (normative) Inspection of
7、thickness . 22 Annex B (normative) Degree of cure of the epoxy resin layer 23 B.1 General . 23 B.2 Apparatus 23 B.3 Description of procedure . 23 B.3.1 Sampling 23 B.3.2 Measurement . 23 B.3.3 Evaluation 23 Annex C (normative) Cathodic disbondment (CD test) 24 C.1 General . 24 C.2 Apparatus 24 C.3 P
8、rocedure 26 C.3.1 Sampling 26 DIN 30670:2012-04 3 Page C.3.2 Measurement . 26 C.3.3 Evaluation 26 Annex D (normative) Peel strength . 27 D.1 General . 27 D.2 Apparatus . 27 D.3 Procedure . 29 D.3.1 Sample preparation . 29 D.3.2 Measurement . 29 D.3.3 Evaluation 29 Annex E (normative) Continuity (hol
9、iday detection) 30 E.1 General . 30 E.2 Apparatus . 30 E.3 Procedure . 30 Annex F (normative) Elongation at break . 31 F.1 General . 31 F.2 Apparatus . 31 F.3 Procedure . 31 F.3.1 Sample preparation . 31 F.3.2 Measurement . 31 F.3.3 Evaluation 31 Annex G (normative) Measuring the melt mass-flow rate
10、 (MFR) . 32 G.1 General . 32 G.2 Apparatus . 32 G.3 Procedure . 32 G.3.1 Sampling 32 G.3.2 Measurement . 32 G.3.3 Evaluation 32 Annex H (normative) Impact resistance and low temperature impact resistance . 33 H.1 General . 33 H.2 Apparatus . 33 H.3 Procedure . 33 H.3.1 Test specimen preparation . 33
11、 H.3.2 Procedure and evaluation 33 Annex I (normative) Indentation resistance . 34 I.1 General . 34 I.2 Apparatus . 34 I.3 Procedure . 34 I.3.1 Test piece preparation 34 I.3.2 Procedure and evaluation 34 Annex J (normative) Specific electrical coating resistance . 35 J.1 General . 35 J.2 Apparatus .
12、 35 J.3 Procedure . 35 J.3.1 Test piece preparation 35 J.3.2 Procedure and evaluation 35 Annex K (normative) UV resistance 36 K.1 General . 36 K.2 Apparatus . 36 K.3 Procedure K.3.1 Sample preparation . 36 K.3.2 Measurement . 36 K.3.3 Evaluation 36 . 36DIN 30670:2012-04 4 Page Annex L (normative) Th
13、ermal ageing resistance 37 L.1 General . 37 L.2 Apparatus 37 L.3 Procedure 37 L.3.1 Sample preparation 37 L.3.2 Measurement . 37 L.3.3 Evaluation 37 DIN 30670:2012-04 5 Foreword This standard has been revised by Working Committee NA 032-02-09 AA Auenkorrosion of the Normen-ausschuss Gastechnik (NAGa
14、s) (Gas Technology Standards Committee). The previous edition of DIN 30670 was published in 1991 and could not be revised for a long time because work was being carried out on the European standards project EN 10288. The present edition of DIN 30670 not only covers fields of application that are not
15、 dealt with in DIN EN ISO 21809-1 and DIN EN 10288, it also takes into consideration the current state of the art, not only as regards the tests and test frequencies specified here for the first time, but also as regards various product requirements. The option of agreeing on design temperatures for
16、 different types of coating, and of agreeing on a special, greater coating thickness have been maintained here. A 1 mm thickness is necessary for the polyethylene coating layer in terms of corrosion protection, while the remaining layer thicknesses serve to improve resistance to mechanical loading.
17、A check of the effectiveness of stabilizing agents by controlling the MRF before and after extrusion has now been specified. The test of the degree of cure of the epoxy resin coating by means of DSC measurement is also new, as is the cathodic disbondment test, which is frequently required at interna
18、tional level. Extensive investigations and practical experience have shown that, regardless of the manufacturing method, disbondment of damaged polyethylene coatings can occur depending on the salinity of the soil water and the extent of cathodic polarization. However this involves neither an increa
19、sed risk of corrosion (underrusting) nor an increase in the protective current density requirement in cathodic corrosion protection. The cathodic disbondment test thus does not serve to evaluate the boundary phase reaction in the case of damaged coatings, which is unavoidable in practice, but is pri
20、marily a means of assessing the boundary areas between the epoxy resin layer and the steel substrate. This test has therefore been specified here to evaluate surface preparation. For single-layer sintered polyethylene coatings, it is difficult to achieve the required peel strength without suitable s
21、urface preparation, and so the cathodic disbondment test is not required for single-layer sintered polyethylene coatings. The peel strength requirements have been adapted to the production methods commonly used today. The differences between sintered and extruded (by sleeve extrusion or sheet extrus
22、ion) coatings have been taking into consideration. Experience gained in the transport and laying of pipes and pipelines with polyethylene coatings has shown that a high bond strength is necessary to reduce possible mechanical damage to the pipes. Bond strength is not a significant factor with regard
23、 to the protection the coating provides against corrosion, as long as the thickness and quality of the coating meet the requirements of this standard and as long as the coating is undamaged and is in good contact along the entire pipe length. In the Explanatory Notes to DIN 30670:1991-04 reference w
24、as made to the possibility of testing stress crack formation under the influence of wetting agents. Today, findings confirm that the testing of new materials exposed to wetting agents at high temperatures does not have any significance as regards ageing-related stress cracking behaviour. Relevant ch
25、anges to the materials during operation, such as a reduction of elongation-at-break and tear strength values and thus changes to the fracture properties of the polyethylene are not well-described in short-term tests involving exposure to wetting agents even at higher test temperatures. The saponific
26、ation of adhesive components, and thus stress crack formation due to the effects of wetting agents, are not possible when an epoxy resin primer and adhesive copolymers are used in a three-layer coating system. This also applies for single-layer sintered polyethylene coatings. For this reason, a wett
27、ing agent test is not specified in this standard. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN and/or the DKE shall not be held responsible for identifying any or all such patent rights. DIN 30670:2012-04 6 Amendments The s
28、tandard differs from DIN 30670:1991-04 as follows: a) the scope has been restricted; b) requirements and testing of the epoxy resin primer of three-layer polyethylene coatings are specified; c) test frequencies are now specified; d) current standards have been taken into consideration; e) requiremen
29、ts for documentation are specified; f) separate requirements for the different coating methods (sintering or extrusion) are specified; g) the temperature has been modified; h) testing of cathodic disbondment is specified; i) two-layer extruded polyethylene coatings are no longer included as they are
30、 covered by DIN EN 10288; j) agreement on special coating thicknesses is now permitted. Previous editions DIN 30670: 1974-02, 1980-07, 1991-04 DIN 30670:2012-04 7 1 Scope This standard specifies requirements for factory-applied three-layer extruded polyethylene-based coatings, and one- or multi-laye
31、red sintered polyethylene-based coatings for the corrosion protection of steel pipes and fittings. The coatings are suitable for the protection of buried or submerged steel pipes at design temperatures of 40 C up to +80 C. The present standard specifies requirements for coatings that are applied to
32、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 PE coating provides sufficient protection against the mechanical, thermal and chemical loads occurring during operatio
33、n, transport, storage and installation. DIN EN ISO 21809-1 specifies requirements at international level for three-layer extruded polyethylene- and polypropylene-based coatings for steel pipes for petroleum and natural gas pipeline transportation systems. The following fields of application are not
34、covered by DIN EN ISO 21809-1: all polyethylene-based coatings for steel pipes and fittings used for the conveyance and distribution of water and wastewater, all polyethylene-based coatings for steel pipes and fittings in distribution pipelines for gaseous and liquid media, single- and multi-layer s
35、intered polyethylene-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. Two-layer polyethylene-based coatings are standardized at European level in DIN EN 10288 which was publishe
36、d in December 2003. 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. DIN EN
37、 10204:2005-01, Metallic products Types of inspection documents DIN EN 10288, Steel tubes and fittings for onshore and offshore pipelines External two layer extruded polyethylene based coatings DIN EN ISO 306, Plastics Thermoplastic materials Determination of Vicat softening temperature (VST) DIN EN
38、 ISO 527-1, Plastics Determination of tensile properties Part 1: General principles DIN EN ISO 527-2, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plastics DIN EN ISO 527-3, Plastics Determination of tensile properties Part 3: Test conditions for fi
39、lms and sheets DIN EN ISO 868, Plastics and ebonite Determination of indentation hardness by means of a durometer (Shore hardness) DIN EN ISO 1133-1, Plastics Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Part 1: Standard method DIN EN ISO 1183-1, P
40、lastics Methods for determining the density of non-cellular plastics Part 1: Immer-sion method, liquid pyknometer method and titration method DIN 30670:2012-04 8 DIN EN ISO 2808, Paints and varnishes Determination of film thickness DIN EN ISO 4287, Geometrical Product Specifications (GPS) Surface te
41、xture: Profile method Terms, definitions and surface texture parameters DIN EN ISO 4892-2, Plastics Methods of exposure to laboratory light sources Part 2: Xenon-arc lamps DIN EN ISO 8130-1, Coating powders Part 1: Determination of particle size distribution by sieving DIN EN ISO 8130-2, Coating pow
42、ders Part 2: Determination of density by gas comparison pyknometer (referee method) DIN EN ISO 8130-3, Coating powders Part 3: Determination of density by liquid displacement pyknometer DIN EN ISO 8130-6, Coating powders Part 6: Determination of gel time of thermosetting coating powders at a given t
43、emperature DIN EN ISO 8501-1, Preparation of steel substrates before application of paints and related products Visual assessment of surface cleanliness Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings DIN EN I
44、SO 9001, Quality management systems Requirements DIN EN ISO 11357-1, Plastics Differential scanning calorimetry (DSC) Part 1: General principles DIN EN ISO 11357-2, Plastics Differential scanning calorimetry (DSC) Part 2: Determination of glass transition temperature DIN EN ISO 11357-6, Plastics Dif
45、ferential scanning calorimetry (DSC) Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) DIN EN ISO 15512, Plastics Determination of water content DIN EN ISO 21809-1:2011-10, Petroleum and natural gas industries External coatings for b
46、uried or submerged pipelines used in pipeline transportation systems Part 1: Polyolefin coatings (3-layer PE and 3-layer PP) 3 Terms and definitions For the purposes of this document, the terms and definitions in DIN EN ISO 21809-1 and the following apply. 3.1 product manufacturer supplier of the co
47、ating material suitable for application to the product to be coated NOTE See also DIN EN 10288. 3.2 coater person responsible for applying the coating material to the steel components to be coated in accordance with the requirements of this standard or the deviations therefrom as agreed in the tende
48、r specification and in the order NOTE See also DIN EN 10288. 3.3 purchaser company which buys the coated products NOTE See also DIN EN 10288. DIN 30670:2012-04 9 4 Symbols and abbreviations A0elongation at break in % W impact energy in J I current in A L0, L1lengths used to determine elongation (giv
49、en in same unit, e.g. m or mm) MFR melt mass-flow rate in g/(10 min) OIT oxidation induction time as in DIN EN ISO 11357-6 roughness parameter (average roughness from five successive evaluation areas measured according to DIN EN ISO 4287) ruspecific electrical coating resistance in /m2S area in m U voltage in V T difference in the dew point temperature in C Tg2difference in the glass transition temperature in C correction factor for the impact resistance test DSC differential scann
