1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58polyethylene coating for pipes Requirements and test methodsThe European Standard EN 14628:2005 has
2、 the status of a British StandardICS 23.040.10; 23.040.40Ductile iron pipes, fittings and accessories External BRITISH STANDARDBS EN 14628:2005BS EN 14628:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 November 2005 BSI 28 November 20
3、05ISBN 0 580 46917 4Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Elec
4、tronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis
5、 document comprises a front cover, an inside front cover, the EN title page, pages 2 to 23 and a back cover.The BSI copyright date displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on th
6、is committee can be obtained on request to its secretary.UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard is the official English language version of EN 14628:2005.The UK participation in its preparati
7、on was entrusted to Technical Committee PSE/10, Iron pipes and fittings, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep EUROPEAN STANDARDNORME EU
8、ROPENNEEUROPISCHE NORMEN 14628October 2005ICS 23.040.10; 23.040.40English VersionDuctile iron pipes, fittings and accessories - Externalpolyethylene coating for pipes - Requirements and test methodsTuyaux, raccords et accessoires en fonte ductile -Revtement extrieur en polythylne de tuyaux -Exigence
9、s et mthodes dessaiRohre, Formstcke und Zubehr aus duktilem Gusseisen -Polyethylenumhllung von Rohren - Anforderungen undPrfverfahrenThis European Standard was approved by CEN on 29 August 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions f
10、or giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official v
11、ersions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium,
12、Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROP
13、EN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14628:2005: EEN 14628:2005 (E) 2 Contents Page Foreword 3 Introduction4 1 Sc
14、ope .5 2 Normative references .5 3 Terms and definitions.5 4 Ordering information 7 5 Technical Requirements.7 6 Performance requirements.9 7 Test Methods.11 Annex A (informative) Quality assurance .16 Annex B (informative) Application process19 Annex C (informative) Coating material21 Bibliography.
15、23 EN 14628:2005 (E) 3 Foreword This European Standard (EN 14628:2005) has been prepared by Technical Committee CEN/TC 203 “Cast iron pipes, fittings and their joints”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publi
16、cation of an identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement thi
17、s European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 1462
18、8:2005 (E) 4 Introduction This European Standard is in conformity with the general requirements already established by CEN/TC 164 in the field of water supply (e.g. potable water) and CEN/TC 165 in the field of waste water. In respect of potential adverse effects on the quality of water intended for
19、 human consumption, caused by the product covered by this standard: a) this European Standard provides no information as to whether the product may be used without restriction in any of the member states of the EU or EFTA; b) it should be noted that, while awaiting the adoption of verifiable Europea
20、n criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. EN 14628:2005 (E) 5 1 Scope This European Standard defines the requirements and test methods applicable to factory applied extruded polyethylene coatings for the external corrosio
21、n protection of ductile iron pipes conforming to EN 545, EN 598 and EN 969 for use at operating temperatures up to 50 C. This European Standard does not cover ductile iron pipes protected with thin PE sleeve. Special works at site like drilling, tapping etc. may influence the corrosion protection pr
22、operties. Those job steps shall be included in the instructions of pipe saddle and accessory manufacturers and all other essential installation instructions. These instructions are not part of this European Standard. 2 Normative references The following referenced documents are indispensable for the
23、 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. EN 545, Ductile iron pipes, fittings, accessories and their joints for water pipelines Requirements and test
24、methods. EN 598, Ductile iron pipes, fittings, accessories and their joints for sewerage application Requirements and test methods. EN 969, Ductile iron pipes, fittings, accessories and their joints for gas pipelines Requirements and test methods. EN 1238, Adhesives Determination of the softening po
25、int of thermoplastic adhesives (ring and ball). EN ISO 527-1, Plastics Determination of tensile properties - Part 1: General principles (ISO 527-1:1993 including Corr 1:1994). EN ISO 527-2, Plastics Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics (IS
26、O 527-2:1993 including Corr 1:1994). EN ISO 1133, Plastics Determination of the melt mass - flow rate (MFR) and the melt volume - flow rate (MVR) of thermoplastics (ISO 1133:1997). EN ISO 3681, Binders for paints and varnishes Determination of saponification value Titrimetric method (ISO 3681:1996).
27、 EN ISO 4892-2, Plastics Methods of exposure to laboratory light sources Part 2: Xenon-arc sources (ISO 4892-2:1994). 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 ductile iron cast iron used for pipes, fittings and accessories in
28、which graphite is present substantially in spheroidal form 3.2 elongation at break relative change in length of the specimen of the polyethylene material when it breaks in a tensile test EN 14628:2005 (E) 6 3.3 heat ageing artificial ageing of the polyethylene under the effects of hot air at a given
29、 temperature and over a given period 3.4 impact strength impact energy which a coating can withstand without damage under defined test conditions 3.5 indentation resistance resistance of the coating to the penetration of a punch under defined test conditions 3.6 light ageing artificial ageing of the
30、 polyethylene under the effects of xenon arc radiation at an elevated temperature and at a given level of atmospheric humidity using a xenon test apparatus 3.7 minimum coating thickness lower limit specified for the polyethylene coating thickness 3.8 non-porosity absence of holidays in a high voltag
31、e test under defined test conditions 3.9 peel resistance force required to peel off a strip of polyethylene coating over a defined peeling path under defined test conditions 3.10 polyethylene coating coating which generally consists of two factory applied layers: an adhesive layer applied by extrusi
32、on or by hot spraying; and an extruded polyethylene compound outer layer applied either by the tubular extrusion method (cross head extrusion) or by the flat die wrapping extrusion method. 3.11 specific coating resistance surface related electric resistance of the coating perpendicular to the pipe w
33、all 3.12 performance test test which is done once and is repeated only after change of polymer supplier, polymer material or relevant change in process application 3.13 routine test test carried out to control the manufacturing process with a frequency defined by the manufacturer EN 14628:2005 (E) 7
34、 4 Ordering information 4.1 General The following information shall be supplied to the manufacturer by the purchaser: 4.2 Mandatory Ductile iron pipes according to EN 545, EN 598 or EN 969, but coated in accordance with this European Standard shall be specified in the purchasers enquiry and order by
35、 reference to this standard: EXAMPLE 5 000 m of ductile iron pipe DN 300 according to EN 545; external polyethylene coating according to EN 14628. 4.3 Options to be indicated by the purchaser One of the following options shall be specified by the purchaser: a) standard thickness, pipe not zinc-coate
36、d: PE-A; b) increased thickness, pipe not zinc-coated: PE-B; c) standard thickness, pipe zinc-coated: PE-C; d) increased thickness, pipe zinc-coated: PE-D. In the event that no option is stipulated option a) shall apply. 5 Technical Requirements 5.1 Surface preparation The polyethylene coating shall
37、 be applied to the works standard oxide skin surface, blast cleaned surface or zinc coated surface of ductile iron pipes. Immediately prior to application the surface of the pipes shall be substantially free of rust (individual incipient rust spots are permissible), loose constituent materials, dirt
38、, oil, grease and moisture. 5.2 Material properties 5.2.1 Polyethylene Only the use of virgin material is permitted. 5.2.2 Adhesive The adhesive consists generally of a blend of rubber and high molecular weight resins and its physical properties shall conform to the values specified in Table 1. Tabl
39、e 1 Adhesive physical properties Property Standard Requirements Softening point EN 1238 70 C to 112 C Saponification value EN ISO 3681 200; This figure shall be reduced by 15 % for DN 200 in order to account for their increased radius of curvature. The minimum distance between two impact points shal
40、l be 30 mm. Care shall be taken to ensure that the impact energy is maintained at a constant level by ensuring that little or no friction is encountered when the falling weight is dropped. Any punctures shall be detected immediately after impact by applying a test voltage of 25 kV (in accordance wit
41、h 7.3). For reasons of statistical accuracy, a sufficient number of impacts shall be carried out until the number of electrical punctures falls into either range A or range C given in Figure 2. If the number of punctures falls into range B (see Figure 2), the test shall be continued accordingly unti
42、l either range A (passed) or range C (failed) is reached. 7.5 Indentation resistance The test is to be carried out on the peeled-off and adhesive-free PE-layer with max. 2 mm thickness, if necessary by grinding off the underside. The test is to be carried out on five specimens taken from different p
43、ipes. If one of the specimens fails to satisfy the requirements, the test is to be repeated on ten additional specimens taken from ten different pipes, in which case none of the specimens may fail. The test apparatus consists of a 250 g metal bar which can receive an additional weight. A metal pin w
44、ith a smooth end face measuring 1,8 mm in diameter (2,5 mm2of punch area) shall be attached centrically to the bottom end of the bar. The total weight shall be 2,5 kg which equates to a pressure of 10 N/mm2. A penetrometer comprising a dial gauge with an accuracy of 0,05 mm is required. The test sha
45、ll be carried out at a temperature of (23 2) C. After a temperature stabilisation period of one hour, the punch without additional weight shall be slowly and carefully placed on the specimen and the zero value determined within 5 s. The additional weight shall subsequently be applied slowly and care
46、fully. The depth of penetration (indentation depth) shall be measured on the penetrometer scale to within 0,05 mm after a loading period of 24 h. 7.6 Elongation at break Ten specimens taken from at least 5 different pipes shall be subjected to this test. The specimens shall be prepared in such a way
47、 that they shall be removed without damage either by applying the PE without adhesive or by subsequently heating the pipe to a maximum temperature of 80 C. The specimens shall be taken in the circumferential direction. The test of elongation at break shall be carried out at a temperature of (23 2) C
48、 in accordance with EN ISO 527-2 on shoulder test bars type 1B. Measurements shall be taken between measuring marks at a speed of 50 mm/min in accordance with EN ISO 527-1. For smaller diameters test bar type 1BA may be used. In this case a speed of 20 mm/min shall apply. 7.7 Specific coating resist
49、ance Five specimens each with a test area of not less than 0,03 m2taken from five different pipes shall be tested. If one of the specimens does not satisfy the requirements, the test shall be repeated on 10 further specimens, in which case none of the specimens may fail. Prior to the test each specimen shall be tested for non-porosity (see 7.3). The test equipment shall comprise a counter electrode with a surface area of not less than 10 cm2, a DC source with an output voltage of not less
