1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 28721-1:2011Vitreous and porcelain enamels Glass-lined apparatus forprocess plantsPart 1: Quality requirements for apparatus,components, appliances and accessories(ISO
2、28721-1:2008)BS EN ISO 28721-1:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 28721-1:2011. It is identical to ISO 28721-1:2008. It supersedes BS EN 15159-1:2006, which is withdrawn.The UK participation in its preparation was entrusted to Technical Com
3、mittee STI/36, Vitreous enamel coatings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 58
4、0 72281 3 ICS 25.220.50; 71.120.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate Text affectedEUROPEAN ST
5、ANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28721-1 April 2011 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) m
6、aux vitrifis - Appareils maills pour les installations industrielles - 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 f
7、r Apparate, Apparateteile, Einbau- und Zubehrteile (ISO 28721-1:2008) 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 stand
8、ard without any alteration. Up-to-date lists and bibliographical 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 an
9、y other language made by translation under the responsibility 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 Repu
10、blic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, 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
11、 NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: 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: EBS EN ISO 28721-1:2011 EN ISO 28721-1:2011 (E) 3 Foreword Th
12、e text of 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”
13、the secretariat 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. Attentio
14、n is drawn 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, t
15、he national 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, Nethe
16、rlands, Norway, 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. BS EN ISO 28721-1:2011ISO 28721-1:2008(E) ISO 2008 All rights
17、reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references 1 3 Requirements.2 4 Testing 5 5 Manufacturing stages and inspections .7 6 Repairing defects.8 7 Test report 10 8 Packaging and transportation11 9 Inspection at delivery 11 Annex A (informative) Examples of test reports 12 Biblio
18、graphy 19 BS EN ISO 28721-1:2011ISO 28721-1:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out throu
19、gh 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 part in the work. ISO collabora
20、tes closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standar
21、ds. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of th
22、is document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 28721-1 was prepared by the European Committee for Standardization (CEN) (as EN 15159-1) and was adopted, under a special “fast-track procedure”, by Technical Committ
23、ee ISO/TC 107, Metallic and other inorganic coatings, in parallel with its approval by the ISO member bodies. ISO 28721-1 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, comp
24、onents, appliances and accessories Part 2: Designation and specification of resistance to chemical attack and thermal shock Part 3: Thermal shock resistance BS EN ISO 28721-1:2011INTERNATIONAL STANDARD ISO 28721-1:2008(E) ISO 2008 All rights reserved 1Vitreous and porcelain enamels Glass-lined appar
25、atus for process plants Part 1: Quality requirements for apparatus, components, appliances and accessories 1 Scope This part of ISO 28721 specifies the quality requirements for apparatus, components, appliances and accessories of glass-lined steel (including semi-crystallized enamel coatings) and gl
26、ass-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 repair defects. It is also applicable to glass-lined pumps, pump components and fittings. It is not applicable to glass-lin
27、ed 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. The test methods specified cover checking the enamel, the dimensional accuracy and the performance of apparatus and compo
28、nents. 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 physical properties of vitreous and porcelain enamels. NOTE 2 Examples of test reports are given in Annex A. 2 Normative
29、 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. ISO 780, Packaging Pictorial marking
30、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-lined apparatus for process plants Part 2: Designation and specification of resistance to chemical attack and thermal shock
31、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 BS EN ISO 28721-1:2011ISO 28721-1:2008(E) 2 ISO 2008 All rights reserved3 Requirements 3.1 General If the requirements give
32、n 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 from those stated in this part of ISO 28721 may be agreed upon between the parties at the time of orde
33、ring. 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 colour) shall be agreed upon between the interested parties at the time of ordering. The characteristi
34、c 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 ISO 28721-3. 3.3 Surface The enamel coating shall have a uniform, smooth, fully-fused surface free from
35、 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 would render a component unusable. Such defects are typically as follows: a) defects which cannot be re
36、paired 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; b) collapsed lines in the cover coat; c) bubble lines, i.e. fused-in bubbles arranged in a distinct li
37、ne; 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) devitrified areas in vitreous enamel or over crystallized areas in semi-crystallized enamel (recognizable as a
38、dull or a rough surface); BS EN ISO 28721-1:2011ISO 28721-1:2008(E) ISO 2008 All rights reserved 3g) pull-through of ground coat (recognizable as e.g. spot-like discolorations); h) cracks detectable by e.g. a statiflux test; i) spots with a diameter 30 mm caused by grinding and polishing during the
39、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 equipment after repair. Common repairable defects are: a) depressions with a depth exce
40、eding 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) impurities in the enamel coating. Isolated impurities, such as fire clay particles, shal
41、l 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 or is not fused parallel to the surface. The maximum permissible number of defects
42、 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. Defects as defined in 3.4.3 a) and 3.4.3 b) shall be repaired as described in 6.1.
43、 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 Agitator vessels Type AE Nominal volume m3Lower part of vessel Main cover Types BE
44、 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. BS EN ISO 28721-1:2011ISO 28721-1:2008(E) 4 ISO 2008 All rights reservedTable 2 Maximum permissible number
45、 of plugged enamel defects in columns Maximum permissible number of defects for unit lengths Nominal 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
46、of repairable defects to be covered with plugs. Exceptions apply in the following cases: a) outlet 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, includ
47、ing 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 Accessories Accessories such as agitators, ba
48、ffles, thermo pipes, probes, inlet pipes, washers, manhole covers and dip-pipes shall not be repaired by plugging (see 6.1). 3.4.6 Fittings and pump components Fittings and pump components shall not be repaired by plugging (see 6.1). 3.5 Coating thickness The thickness of enamel coatings on steel su
49、bstrates shall range from 1,0 mm to 2,2 mm, with the following exceptions: a) maximum values may be exceeded by 0,2 mm on concave surfaces; b) the enamel coating may be 0,2 mm thinner than the specified minimum value in limited areas and on convex surfaces; c) coatings on small parts with very small radii u 5 mm, such as valve stems or rotors of pumps, may have a minimum thickness of 0,6 mm. Any changes in thickness shall be smooth. 3.6 General tolerances General tolerances an
