1、June 2011 Translation by DIN-Sprachendienst.English price group 13No 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 2
2、5.220.50!$s9b“1802263www.din.deDDIN EN ISO 28721-1Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 1: Quality requirements for apparatus, components, appliances andaccessories (ISO 28721-1:2008)English translation of DIN EN ISO 28721-1:2011-06Emails und Emaillierungen Ema
3、illierte Apparate fr verfahrenstechnische Anlagen Teil 1: Qualittsanforderungen fr Apparate, Apparateteile, Einbau- und Zubehrteile(ISO 28721-1:2008)Englische bersetzung von DIN EN ISO 28721-1:2011-06maux vitrifis Appareils maills pour les installations industrielles Partie 1: Exigences de qualit re
4、latives aux appareillages, composants, appareils etaccessoires (ISO 28721-1:2008)Traduction anglaise de DIN EN ISO 28721-1:2011-06SupersedesDIN EN 15159-1:2006-10www.beuth.deDocument comprises 26 pagesIn case of doubt, the German-language original shall be considered authoritative.06.11 DIN EN ISO 2
5、8721-1:2011-06 2 A comma is used as the decimal marker. National foreword This standard 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” (Secretariat: BSI, United K
6、ingdom). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-01-63 AA Prfung von Emails und Emaillierungen. Information on national footnotes In Table 1, the columns marked with “ indicate th
7、at there are no standardized vessel types for the respective nominal volumes. Users of this standard are granted the right to duplicate, in its entirety, the form given in Annex A, without prejudicing the rights of DIN. It should be noted that DIN 2876 referred to in the Bibliography of the ISO Stan
8、dard has been replaced by DIN EN 15711:2009-08. EN ISO 28721 consists of the following parts, under the general title Vitreous and porcelain enamels Glasslined apparatus for process plants: Part 1: Quality requirements for apparatus, components, appliances and accessories Part 2: Designation and spe
9、cification of resistance to chemical attack and thermal shock Part 3: Thermal shock resistance The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 780 DIN EN ISO 780 ISO 2178 DIN EN ISO 2178 ISO 2808 DIN EN ISO 2808 ISO 28721-2 DIN EN ISO 2
10、8721-2 ISO 28721-3 DIN EN ISO 28721-3 Amendments This standard differs from DIN EN 15159-1:2006-10 as follows: a) the number of the standard has been changed; b) the standard has been editorially revised. Previous editions DIN 28063: 1993-07, 1999-08 DIN 28063 Supplement 1: 1993-07, 1996-02 DIN EN 1
11、5159-1: 2006-10 ”DIN EN ISO 28721-1:2011-06 3 National Annex NA (informative) Bibliography DIN EN 15771, Vitreous and porcelain enamels Determination of surface scratch hardness according to the Mohs scale DIN EN ISO 780, Packaging Pictorial marking for the handling of goods DIN EN ISO 2178, Non-mag
12、netic coatings on magnetic substrates Measurement of coating thickness Magnetic method DIN EN ISO 2808, Paints and varnishes Determination of film thickness DIN EN ISO 28721-2, Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 2: Designation and specification of resistance
13、 to chemical attack and thermal shock DIN EN ISO 28721-3, Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 3: Thermal shock resistance DIN EN ISO 28721-1:2011-06 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28721-1 April 2011
14、 ICS 25.220.50 Supersedes EN 15159-1:2006English Version Vitreous and porcelain enamels - Glass-lined apparatus for process plants - Part 1: Quality requirements for apparatus, components, appliances and accessories (ISO 28721-1:2008) maux vitrifis - Appareils maills pour les installations industrie
15、lles - Partie 1: Exigences de qualit relatives aux appareillages, composants, appareils et accessoires (ISO 28721-1:2008) Emails und Emaillierungen - Emaillierte Apparate fr verfahrenstechnische Anlagen - Teil 1: Qualittsanforderungen fr Apparate, Apparateteile, Einbau- und Zubehrteile (ISO 28721-1:
16、2008) This European Standard was approved by CEN on 17 March 2011. 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 bibliographical
17、 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 responsibility of
18、 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, France, Germany, Greece, Hungar
19、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre:
20、 Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 28721-1:2011: EContents PageForeword3 1 Scope 4 2 Normative references 4 3 Requirements.5 4 Testing 8 5 Manufacturing stages and inspection
21、s .10 6 Repairing defects.11 7 Test report 13 8 Packaging and transportation14 9 Inspection at delivery 14 Annex A (informative) Examples of test reports 15 Bibliography 22 DIN EN ISO 28721-1:2011-06 EN ISO 28721-1:2011 (E) 2 Foreword DIN EN ISO 28721-1:2011-06 EN ISO 28721-1:2011 (E) 3 The text of
22、ISO 28721-1:2008 has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 28721-1:2011 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the secret
23、ariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2011, and conflicting national standards shall be withdrawn at the latest by October 2011. Attention is drawn
24、 to the possibility that some of the elements of this document may be the 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 15159-1:2006. According to the CEN/CENELEC Internal Regulations, the nationa
25、l standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, No
26、rway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 28721-1:2008 has been approved by CEN as a EN ISO 28721-1:2011 without any modification. 1 Scope This part of ISO 28721 specifies the quality requirements for ap
27、paratus, components, appliances and accessories of glass-lined steel (including semi-crystallized enamel coatings) and glass-lined steel castings used for process plants. It specifies the quality requirements and the tests to be carried out by the manufacturer as well as the action to be taken to re
28、pair defects. It is also applicable to glass-lined pumps, pump components and fittings. It is not applicable to glass-lined flanged steel pipes or glass-lined flanged steel fittings. NOTE 1 Provisions for glass-lined flanged steel pipes and glass-lined flanged steel fittings are given in DIN 28761.
29、The test methods specified cover checking the enamel, the dimensional accuracy and the performance of apparatus and components. This part of ISO 28721 applies to new apparatus and components as well as used items that have been re-enamelled. It does not contain requirements regarding the chemical or
30、 physical properties of vitreous and porcelain enamels. NOTE 2 Examples of test reports are given in Annex A. 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
31、, the latest edition of the referenced document (including any amendments) applies. ISO 780, Packaging Pictorial marking for handling of goods ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method ISO 28721-2, Vitreous and porcelain enamels Glass-lin
32、ed apparatus for process plants Part 2: Designation and specification of resistance to chemical attack and thermal shock ISO 28721-3, Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 3: Thermal shock resistance EN 14430, Vitreous and porcelain enamels High voltage test DI
33、N EN ISO 28721-1:2011-06 EN ISO 28721-1:2011 (E) 4 3 Requirements 3.1 General If the requirements given in this part of ISO 28721 are to be applied to glass-lined apparatus and components, this shall be stated as follows when ordering: Prepared in accordance with ISO 28721-1. Requirements differing
34、from those stated in this part of ISO 28721 may be agreed upon between the parties at the time of ordering. 3.2 Design and quality of enamel finish The manufacturer shall be responsible for the appropriate design and construction. The enamel quality (i.e. the type of enamel and, where relevant, the
35、colour) shall be agreed upon between the interested parties at the time of ordering. The characteristic composition of individual enamel layers shall correspond to that of specimens submitted for laboratory testing. The quality of the enamel shall meet the requirements specified in ISO 28721-2 and I
36、SO 28721-3. 3.3 Surface The enamel coating shall have a uniform, smooth, fully-fused surface free from impurities. 3.4 Defects 3.4.1 General Defects shall be examined visually (see 4.2). 3.4.2 Defects unacceptable in the finished product Defects unacceptable in the finished product are those which w
37、ould render a component unusable. Such defects are typically as follows: a) defects which cannot be repaired by the means described in Clause 6, such as: defects extending over an area with a diameter 8 mm, defects on inaccessible spots, defects concerning vessels and columns as described in 3.4.4;
38、b) collapsed lines in the cover coat; c) bubble lines, i.e. fused-in bubbles arranged in a distinct line; d) fused strain lines (recognizable as lines with colours different from that of the surrounding enamel); e) areas not properly fused (a rough surface similar to a sandblasted one); f) devitrifi
39、ed areas in vitreous enamel or over crystallized areas in semi-crystallized enamel (recognizable as a dull or a rough surface); DIN EN ISO 28721-1:2011-06 EN ISO 28721-1:2011 (E) 5 g) pull-through of ground coat (recognizable as e.g. spot-like discolorations); h) cracks detectable by e.g. a statiflu
40、x test; i) spots with a diameter 30 mm caused by grinding and polishing during the removal of impurities (see also 3.4.3 and 6.2). 3.4.3 Repairable defects Repairable defects are imperfections in the enamel coating which allow, under certain circumstances (see below), further use of glass-lined equi
41、pment after repair. Common repairable defects are: a) depressions with a depth exceeding 25 % of the coating thickness; b) blisters, such as circular holes in the coating exposing the ground coat; c) areas with weak spots or defects detectable by high-voltage testing in accordance with 4.3; d) impur
42、ities in the enamel coating. Isolated impurities, such as fire clay particles, shall be removed. Dust-like impurities on the surface may be accepted. Scale fused into the surface shall be removed where it extends parallel to the surface over a distance of more than 3 mm and/or is not a flat particle
43、 or is not fused parallel to the surface. The maximum permissible number of defects repaired by plugging shall be as given in Tables 1 and 2. Further requirements, such as the maximum level of pores or use without plugging, shall be agreed upon between the interested parties at the time of ordering.
44、 Defects as defined in 3.4.3 a) and 3.4.3 b) shall be repaired as described in 6.1. Specifications regarding defects in various types of apparatus and components are given in 3.4.4 to 3.4.6. Table 1 Maximum permissible number of plugged enamel defects in vessels Maximum permissible number of defects
45、 Agitator vessels Type AE Nominal volume m3Lower part of vessel Main cover Types BE and CEaOther vessels up to 4 0 0 0 0 over 4 to 10 1 1 1 1 over 10 to 20 2 3 over 20 to 32 3 4 over 32 to 40 4 5 over 40 to 80 6 over 80 7 aAssembly covers shall be delivered without any plugs. N1)nominal volumes. N1)
46、 National footnote: Columns marked with “” indicate that there are no standardized vessel types for the respective DIN EN ISO 28721-1:2011-06 EN ISO 28721-1:2011 (E) 6 Table 2 Maximum permissible number of plugged enamel defects in columns Maximum permissible number of defects for unit lengths Nomin
47、al diameter of column mm up to 2 000 mm over 2 000 mm up to 5 000 mm over 5 000 mm up to 600 0 0 0 over 600 to 1 200 0 1 2 over 1 200 1 2 3 3.4.4 Vessels and columns Table 1 and Table 2 list the number of repairable defects to be covered with plugs. Exceptions apply in the following cases: a) outlet
48、 nozzles and agitator nozzles, including the complete neck area around the nozzle, shall not be repaired by plugging (this also applies to other nozzles with a nominal diameter of 150 mm or less, including the neck area which extends out 30 mm beyond the inner nozzle diameter); b) convex and concave surfaces with a radius of 75 mm or less shall not be repaired by plugging; c) seal areas (gasket bearing surfaces) shall not be repaired by plugging. 3.4.5
