1、September 2013 Translation by DIN-Sprachendienst.English price group 15No 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).
2、ICS 23.040.10!%1J“2145939www.din.deDDIN 30678Polypropylene coatings on steel pipes and fittings Requirements and testing,English translation of DIN 30678:2013-09Polypropylen-Umhllungen von Rohren und Formstcken aus Stahl Anforderungen und Prfungen,Englische bersetzung von DIN 30678:2013-09Revtements
3、 base de polypropylne de tubes et raccords en acier Exigences et essais,Traduction anglaise de DIN 30678:2013-09SupersedesDIN 30678:1992-10www.beuth.deDocument comprises 35 pagesIn case of doubt, the German-language original shall be considered authoritative.06.14 DIN 30678:2013-09 2 A comma is used
4、 as the decimal marker. Contents Page Foreword . 5 1 Scope . 7 2 Normative references . 7 3 Terms and definitions 8 4 Symbols and abbreviations . 9 5 Coating . 9 6 Information to be supplied by the purchaser 9 6.1 Mandatory information . 9 6.2 Order options 9 7 Application of the coating 10 7.1 Gene
5、ral . 10 7.2 Surface preparation 10 7.3 Composition of the coating . 10 7.3.1 General . 10 7.3.2 Epoxy resin primer . 11 7.3.3 Polypropylene adhesive (PP adhesive) 11 7.3.4 Polypropylene . 11 7.3.5 Cutback 12 8 Requirements 12 8.1 General . 12 8.2 Material properties 12 8.3 Production monitoring . 1
6、5 8.3.1 Surface preparation 15 8.3.2 Pipe coating . 15 9 Inspection and testing 15 9.1 General . 15 9.2 Inspection documents 15 9.3 Types and frequency of tests 16 10 Repairs . 18 11 Marking 18 12 Handling, transportation and storage. 18 Annex A (normative) Inspection of thickness . 19 Annex B (norm
7、ative) Degree of cure of the epoxy resin layer 20 B.1 General . 20 B.2 Apparatus 20 B.3 Procedure 20 B.3.1 Sampling 20 B.3.2 Measurement . 20 B.3.3 Evaluation 21 DIN 30678:2013-09 3 Page Annex C (normative) CD Test (cathodic disbondment) 22 C.1 General . 22 C.2 Apparatus . 22 C.3 Procedure . 24 C.3.
8、1 Preparation of specimens 24 C.3.2 Measurement . 24 C.3.3 Evaluation 24 Annex D (normative) Peel strength . 25 D.1 General . 25 D.2 Apparatus . 25 D.3 Procedure . 27 D.3.1 Sample preparation . 27 D.3.2 Measurement . 27 D.3.3 Evaluation 27 Annex E (normative) Continuity (holiday detection) . 28 E.1
9、General . 28 E.2 Apparatus . 28 E.3 Procedure . 28 Annex F (normative) Elongation at break . 29 F.1 General . 29 F.2 Apparatus . 29 F.3 Procedure . 29 F.3.1 Preparation of specimens 29 F.3.2 Measurement . 29 F.3.3 Evaluation 29 Annex G (normative) Measuring the melt mass-flow rate (MFR) . 30 G.1 Gen
10、eral . 30 G.2 Apparatus . 30 G.3 Procedure . 30 G.3.1 Sampling 30 G.3.2 Measurement . 30 G.3.3 Evaluation 30 Annex H (normative) Impact resistance and low temperature impact resistance . 31 H.1 General . 31 H.2 Apparatus . 31 H.3 Procedure . 31 H.3.1 Preparation of specimens 31 H.3.2 Procedure and e
11、valuation 31 Annex I (normative) Indentation resistance . 32 I.1 General . 32 I.2 Apparatus . 32 I.3 Procedure . 32 I.3.1 Preparation of specimens 32 I.3.2 Procedure and evaluation 32 Annex J (normative) Specific electrical coating resistance . 33 J.1 General . 33 J.2 Apparatus . 33 J.3 Procedure .
12、33 J.3.1 Preparation of specimens 33 J.3.2 Procedure and evaluation 33 DIN 30678:2013-09 4 Page Annex K (normative) UV resistance . 34 K.1 General . 34 K.2 Apparatus 34 K.3 Procedure 34 K.3.1 Preparation of specimens 34 K.3.2 Measurement . 34 K.3.3 Evaluation 34 Annex L (normative) Thermal ageing re
13、sistance 35 L.1 General . 35 L.2 Apparatus 35 L.3 Procedure 35 L.3.1 Preparation of specimens 35 L.3.2 Measurement . 35 L.3.3 Evaluation 35 DIN 30678:2013-09 5 Foreword This standard has been revised by Working Committee NA 032-02-09 AA Auenkorrosion of the Normenausschuss Gastechnik (NAGas) (Gas Te
14、chnology Standards Committee). The previous edition of DIN 30678 was published in 1992 and could not be revised for a long time because work was being carried out on the European standards project EN 10286. The present edition of DIN 30678 not only covers fields of application that are not dealt wit
15、h in DIN EN ISO 21809-1, 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. A check of the effectiveness of stabilizing agents by controlling the MRF be
16、fore 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 international level. Extensive investigations and practical experience have shown t
17、hat, regardless of the manufacturing method, disbondment of damaged polypropylene coatings can occur depending on the salinity of the soil water and the extent of cathodic polarization. However this involves neither an increased risk of corrosion (underrusting) nor an increase in the protective curr
18、ent 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 primarily a means of assessing the boundary areas between the epoxy resin laye
19、r and the steel substrate. For single-layer sintered polypropylene coatings, it is difficult to achieve the required peel strength without suitable surface preparation, and so the cathodic disbondment test is not required for single-layer sintered polypropylene coatings. The peel strength requiremen
20、ts have been adapted to the production methods commonly used today. The differences between sintered and extruded (by sleeve extrusion or sheet extrusion) coatings have been taken into consideration. Experience gained in the storage, transport and laying of pipes and pipelines with polypropylene coa
21、tings 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 to the protection the coating provides against corrosion, as long as the thickness and quality of the coating meet the requirements of this
22、standard. In the Explanatory Notes to DIN 30678:1992-10, reference was 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 significa
23、nce as regards ageing-related stress cracking behaviour. Relevant changes 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 polypropylene are not well-described in short-term tests involving expos
24、ure to wetting agents even at higher test temperatures. The saponification 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
25、 single-layer sintered polypropylene coatings. For this reason, a wetting 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 DKE shall not be held responsible for identifying a
26、ny or all such patent rights. DIN 30678:2013-09 6 Amendments The standard differs from DIN 30678:1992-10 as follows: a) the scope has been restricted; b) requirements and testing of the epoxy resin primer of three-layer polypropylene coatings are specified; c) test frequencies are now specified; d)
27、current standards have been taken into consideration; e) requirements 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) the peel
28、 strength has been adjusted. Previous editions DIN 30678: 1992-10 DIN 30678:2013-09 7 1 Scope 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 st
29、eel 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 provid
30、es 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 p
31、etroleum 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 st
32、eel 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. T
33、he coatings are suitable for the protection of buried or submerged steel pipes at design temperatures of 20 C up to +110 C (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 C. The purchaser shall specify t
34、emperature ranges below 0 C and above 90 C, as this could require adjustments to be made in the coating components. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only t
35、he edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN EN 10204:2005-01, Metallic products Types of inspection documents DIN EN ISO 306, Plastics Thermoplastic materials Determination of Vicat softening temperature (VST
36、) DIN EN ISO 527-1, Plastics Determination of tensile properties Part 1: General principles DIN EN ISO 527-2:2012-06, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plastics DIN EN ISO 868, Plastics and ebonite Determination of indentation hardness by
37、 means of a durometer (Shore hardness) DIN EN ISO 1133-1:2012-03, Plastics Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Part 1: Standard method DIN EN ISO 2808:2007-05, Paints and varnishes Determination of film thickness DIN EN ISO 4287, Geometric
38、al product specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters DIN EN ISO 4577, Plastics Polypropylene and propylene-copolymers Determination of thermal oxidative stability in air, oven method DIN 30678:2013-09 8 DIN EN ISO 4892-2, Plastics Methods
39、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 powders Part 2: Determination of density by gas comparison pyknometer (referee method) DIN EN ISO 8130-3, Coati
40、ng 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 temperature DIN EN ISO 8501-1, Preparation of steel substrates before application of paints and related produ
41、cts 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 ISO 9001, Quality management systems Requirements DIN EN ISO 11357-1, Plastics Differential scanning calorime
42、try (DSC) Part 1: General principles DIN EN ISO 11357-6, Plastics Differential 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:
43、2011-10, Petroleum and natural gas industries External coatings for buried or submerged pipelines used in pipeline transportation systems Part 1: Polyolefin coatings ISO 11357-2, Plastics Differential scanning calorimetry (DSC) Part 2: Determination of glass transition temperature 3 Terms and defini
44、tions 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 coating material suitable for application to the product to be coated 3.2 coater person responsible for applying the coating material to the stee
45、l components to be coated in accordance with the requirements of this standard or the deviations therefrom as agreed in the tender specification and in the order 3.3 purchaser company which buys the coated products DIN 30678:2013-09 9 4 Symbols and abbreviations A0is the elongation at break in % W i
46、s the impact energy in J I is the current in A L0, L1are the lengths used to determine elongation (given in same unit, e.g. m or mm) MFR is the melt mass-flow rate in g/(10 min) OIT is the oxidation induction time as in DIN EN ISO 11357-6*)Rz is the roughness parameter (average roughness from five s
47、uccessive evaluation areas measured according to DIN EN ISO 4287) ruis the specific electrical coating resistance in m2S is the area in m2U is the voltage in V T is the difference in the dew point temperature in C Tg2is the difference in the glass transition temperature in C is the correction factor
48、 for the impact resistance test DSC is the differential scanning calorimetry as in DIN EN ISO 11357-1 5 Coating The extruded coatings consist of three layers: an epoxy resin primer, a PP adhesive and an extruded polypropylene outer layer. The epoxy resin primer is applied as a powder. The adhesive can be applied either as a powder or by extrusion. For extruded coatings a differentiation is made between sleeve extrusion and sheet extrusion. Sintered polypropylene coatin
