1、BSI Standards PublicationBS EN ISO 28721-4:2015Vitreous and porcelain enamels Glass-lined apparatus forprocess plantsPart 4: Quality requirements for glass-linedflanged steel pipes and flanged steel fittingsBS EN ISO 28721-4:2015 BRITISH STANDARDNational forewordThis British Standard is the UK imple
2、mentation of EN ISO 28721-4:2015.It supersedes BS EN ISO 28721-4:2012 which is withdrawn. The UK participation in its preparation was entrusted to TechnicalCommittee STI/36, Vitreous enamel coatings.A list of organizations represented on this committee can beobtained on request to its secretary.This
3、 publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 85959 5ICS 25.220.50Compliance with a British Standard cannot confer imm
4、unity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28721-4 November 2015 ICS 25.
5、220.50 Supersedes EN ISO 28721-4:2012English Version Vitreous and porcelain enamels - Glass-lined apparatus for process plants - Part 4: Quality requirements for glass-lined flanged steel pipes and flanged steel fittings (ISO 28721-4:2015) maux vitrifis - Appareils maills pour les installations indu
6、strielles - Partie 4: Exigences de qualit pour les tubes et raccords brides en acier maill (ISO 28721-4:2015) Emails und Emaillierungen - Emaillierte Apparate fr verfahrenstechnische Anlagen - Teil 4: Qualittsanforderungen an Flansch-Rohre und Flansch-Formstcke aus Stahl mit Emaillierung (ISO 28721-
7、4:2015) This European Standard was approved by CEN on 1 November 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliograph
8、ical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibilit
9、y of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of
10、 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION
11、 EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 28721-4:2015 EBS EN ISO 28721-4:2015EN ISO 28721-4:2015 (E) 3 European forewo
12、rd This document (EN ISO 27821-4:2015) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings“ in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the secretariat of which is held by BSI. This European Standard shall be giv
13、en the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2016, and conflicting national standards shall be withdrawn at the latest by May 2016. Attention is drawn to the possibility that some of the elements of this document may be the
14、subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 28721-4:2012. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to impl
15、ement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
16、, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 28721-4:2015 has been approved by CEN as EN ISO 28721-4:2015 without any modification. BS EN ISO 28721-4:2015ISO 28721-4:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms an
17、d definitions . 24 Materials for steel parts 25 Information to be supplied by the purchaser. 26 Requirements 26.1 Requirements for the steel parts . 26.1.1 Welding 26.1.2 Material properties 26.1.3 Surface characteristics 36.1.4 Exterior protection 36.2 Requirements for the glass-lined components .
18、36.2.1 Surfaces 36.2.2 Enamel defects . 36.2.3 Foreign matter in the enamel 36.2.4 Enamel coating thickness . 46.2.5 Dimensions and tolerances . 46.2.6 Other requirements . 47 Tests and certificates 47.1 General . 47.2 Place of testing 47.3 Testing of the substrate . 47.4 Testing of the glass-lined
19、components . 48 Marking 5 ISO 2015 All rights reserved iiiContents PageBS EN ISO 28721-4:2015ISO 28721-4:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards i
20、s normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take par
21、t in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particul
22、ar the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this
23、document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.is
24、o.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WT
25、O principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings.This second edition cancels and replaces the first edition (ISO 28721-4:2010), which has b
26、een technically revised.ISO 28721 consists of the following parts, under the general title Vitreous and porcelain enamels Glass-lined apparatus for process plants: Part 1: Quality requirements for apparatus, components, appliances and accessories Part 2: Designation and specification of resistance t
27、o chemical attack and thermal shock Part 3: Thermal shock resistance Part 4: Quality requirements for glass-lined flanged steel pipes and flanged steel fittings Part 5: Presentation and characterization of defectsiv ISO 2015 All rights reservedBS EN ISO 28721-4:2015INTERNATIONAL STANDARD ISO 28721-4
28、:2015(E)Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 4: Quality requirements for glass-lined flanged steel pipes and flanged steel fittingsWARNING This part of ISO 28721 calls for the use of substances and/or procedures that may be injurious to health if adequate safe
29、ty measures are not taken. This part of ISO 28721 does not address any health hazards, safety or environmental matters associated with its use. It is the responsibility of the user of this part of ISO 28721 to establish appropriate health, safety and environmentally acceptable practices and take sui
30、table actions for any national and international regulations. Compliance with this part of ISO 28721 does not in itself confer immunity from legal obligations.1 ScopeThis part of ISO 28721 specifies the quality requirements for glass-lined flanged steel pipes and flanged steel fittings used for proc
31、ess plants.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including
32、 any amendments) applies.ISO 2746, Vitreous and porcelain enamels High voltage testISO 5817, Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfectionsISO 8501-1, Preparation of steel substrates before application of paints and r
33、elated 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 coatingsISO 12944-5, Paints and varnishes Corrosion protection of steel structures by protective paint systems Pa
34、rt 5: Protective paint systemsISO 28706-2, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or their vapoursISO 28706-4, Vitreous and porcelain enamels Determinatio
35、n of resistance to chemical corrosion Part 4: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vesselISO 28706-5, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 5: Determination of resistance to chemical corrosion in clo
36、sed systemsEN 1708-1, Welding Basic welded joint details in steel Part 1: Pressurized componentsEN 10204, Metallic products Types of inspection documentsEN 13480-2, Metallic industrial piping Part 2: Materials ISO 2015 All rights reserved 1BS EN ISO 28721-4:2015ISO 28721-4:2015(E)EN 13480-3:2002, Me
37、tallic industrial piping Part 3: Design and calculationEN 15826, Vitreous and porcelain enamels TerminologyDIN 2873, Flanged fitting pipes and flanged steel glass lined PN 10 and PN 253 Terms and definitionsFor the purposes of this document, the terms and definitions given in EN 15826 apply.4 Materi
38、als for steel partsThe materials to be used shall be selected by the purchaser or the manufacturer in accordance with EN 13480-2; the material chosen shall be suitable for enamelling.Material selections, technical and all other requirements shall be in accordance with national rules and regulations
39、of the user country and shall be agreed between the interested parties.5 Information to be supplied by the purchaserWhen ordering articles in accordance with this part of ISO 28721, the purchaser shall provide the following information in writing, in, for example, the contract or purchase order, or
40、on engineering drawings:a) a reference to this part of ISO 28721, i.e. ISO 28721-4;b) designation of the dimension standard;c) quantity (number of items);d) materials testing certificates, in accordance with EN 10204 (see 7.1 and 7.3);e) relevant delivery conditions (if applicable).6 Requirements6.1
41、 Requirements for the steel parts6.1.1 Welding6.1.1.1 The pipes and fittings with welding necks shall be welded such that the welded joint is fully penetrated. The welded joints shall conform to a quality level in accordance with ISO 5817 (quality class B) and EN 1708-1. The welding process shall be
42、 monitored to ensure its acceptability. If internal pressure is exerted, the joint coefficient shall be at least 85 %, as specified in EN 13480-3:2002, 4.5.6.1.1.2 Local repair of welded joints is permitted, provided that the repair procedure is suitable to carry out the repair according to the requ
43、ired quality.6.1.1.3 The manufacturer shall have the necessary facilities, procedures and competent staff for welding, and monitoring and testing of welds.6.1.2 Material properties6.1.2.1 Chemical compositionThe chemical composition shall be in accordance with EN 13480-2.2 ISO 2015 All rights reserv
44、edBS EN ISO 28721-4:2015ISO 28721-4:2015(E)6.1.2.2 Mechanical propertiesChanges in the mechanical properties of the substrate due to the glass-lining process shall not cause any degradation of the performance characteristics of the components.6.1.2.3 WeldabilityMaterials to be welded and welding con
45、sumables shall conform to the requirements of EN 13480-2.6.1.3 Surface characteristicsComponents to be provided with an exterior protection shall be blast-cleaned in accordance with ISO 8501-1, preparation grade Sa 21/2.Shallow surface defects may be eliminated, provided that the remaining wall thic
46、kness continues to conform to the requirements.Weld repairs shall only be performed with the approval of the purchaser.6.1.4 Exterior protectionFor exterior protection, a priming coat shall be applied in accordance with ISO 12944-5.6.2 Requirements for the glass-lined components6.2.1 SurfacesThe ena
47、mel coating shall show a uniform, smooth and completely melted surface.6.2.2 Enamel defectsThe flanged pipes and flanged fittings shall not show any of the following enamel defects (see EN 15826): damaged enamel (e.g. chippings, cracks, open pores); collapsed lines in the cover coat; bubble lines, i
48、.e. fused-in bubbles arranged in a distinct line for fused strain lines; areas not properly fused (in the case of vitreous enamel, recognizable by the carborundum-like rough surface); pull-through of ground coat; depressions exceeding more than 25 % of the coating thickness; areas with weak spots or
49、 defects, as detected when tested in accordance with 7.4.2; particles of fireclay.6.2.3 Foreign matter in the enamelTinder particles may appear if none of their dimensions in any direction and parallel to the component-part surface is greater than 3 mm, and provided that they are laminar in shape and melted into the enamel parallel to the surface of the steel part concerned. ISO 2015 All rights reserved 3BS EN ISO 28721-4:2015ISO 28721-4:2015(E)6.2.4 Enamel coating thicknessThe coating thickne
