1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 28723:2011Vitreous and porcelain enamels Determination of theedge covering on enamelledsteel plate to be used in heatexchangers (ISO 28723:2008)BS EN ISO 28723:2011 BRI
2、TISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 28723:2011. It is identical to ISO 28723:2008. It supersedes BS EN 14863:2005, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/36, Vitreous enamel coatings.A lis
3、t 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 0 580 72285 1 ICS 25.220.50 Compliance with a Bri
4、tish 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 T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO
5、28723 March 2011 ICS 25.220.50 Supersedes EN 14863:2005English Version Vitreous and porcelain enamels - Determination of the edge covering on enamelled steel plate to be used in heat exchangers (ISO 28723:2008) maux vitrifis - Dtermination du revtement de larte sur une plaque en acier maill destine
6、aux changeurs de chaleur (ISO 28723:2008) Emails und Emaillierungen - Bestimmung der Kantenabdeckung von emaillierten Stahlblechen fr Wrmeaustauscher (ISO 28723:2008) This European Standard was approved by CEN on 3 March 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
7、 which stipulate the conditions for giving this European Standard the status of a national standard 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. Thi
8、s European Standard exists in three official versions (English, French, German). A version in any 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 memb
9、ers are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
10、 Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE 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 Memb
11、ers. Ref. No. EN ISO 28723:2011: EBS EN ISO 28723:2011 EN ISO 28723:2011 (E) 3 Foreword The text of ISO 28723:2008 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
12、 28723:2011 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” 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 September 2011, and c
13、onflicting national standards shall be withdrawn at the latest by September 2011. Attention 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
14、 document supersedes EN 14863:2005. According to the CEN/CENELEC Internal Regulations, the 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, German
15、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 28723:2008 has been approved by CEN as a EN ISO 28723:2011 with
16、out any modification. BS EN ISO 28723:2011ISO 28723:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references1 3 Principle1 4 Reagents and materials 1 5 Apparatus .2 6 Test specimens3 7 Procedure .4 8 Calculation and expression of results 4 9 Precision.5 10 T
17、est report5 BS EN ISO 28723:2011ISO 28723:2008(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 through
18、 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 collaborate
19、s 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 Standards
20、. 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 this
21、 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 28723 was prepared by the European Committee for Standardization (CEN) (as EN 14863) and was adopted, under a special “fast-track procedure”, by Technical Committee ISO
22、/TC 107, Metallic and other inorganic coatings, in parallel with its approval by the ISO member bodies. BS EN ISO 28723:2011INTERNATIONAL STANDARD ISO 28723:2008(E) ISO 2008 All rights reserved 1Vitreous and porcelain enamels Determination of the edge covering on enamelled steel plate to be used in
23、heat exchangers 1 Scope This International Standard specifies a test method for the determination of the covering of the edge of enamelled steel plate to be used in heat exchangers. This method is applicable to all enamelling processes. It is applicable to plates with a thickness between 0,5 mm and
24、1,5 mm. This method is not applicable where the current flow generated in the test exceeds 3 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, the latest e
25、dition of the referenced document (including any amendments) applies. ISO 3696, Water for analytical laboratory use Specification and test methods EN 10088-1, Stainless steels List of stainless steels 3 Principle The edge of an enamelled steel plate to be tested is submerged in an electrolyte. An al
26、ternating current source and a stabilized voltage are connected to the plate. The recorded current is a measure of the covering at the edge. 4 Reagents and materials During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and distilled or de-mineralized water o
27、r water of equivalent purity. 4.1 Pickling fluid, consisting of sulfuric acid (H2SO4) solution, (7 0,5) % by mass, with an Fe2+concentration of (2 1,5) g/l, at a temperature of (60 2) C. 4.2 Test bath electrolyte, consisting of sodium chloride solution, 5 % NaCl by mass, made with distilled water co
28、nforming to grade 3 of ISO 3696, at a temperature of (22 3) C. BS EN ISO 28723:2011ISO 28723:2008(E) 2 ISO 2008 All rights reserved5 Apparatus 5.1 Test bath, consisting of a polypropylene container holding the electrolyte solution in which the electrodes and a test plate are placed. Polypropylene pl
29、ates are used for centring and holding the test plate 10 mm from the bottom of the bath. The arrangement of the bath and the dimensions of the components are shown in Figures 1, 2 and 3. Dimensions in millimetres Key 1 plate to be tested 2 plates for centring and lifting the test plate from the bott
30、om Figure 1 Dimensions of the test bath Dimensions in millimetres Key 1 electrode (1 264 mm long) 2 NaCl solution Figure 2 Dimensions of the two stainless-steel electrodes (EN 10088-1 grade 1.4301) BS EN ISO 28723:2011ISO 28723:2008(E) ISO 2008 All rights reserved 3Dimensions in millimetres Figure 3
31、 Dimensions of the two polypropylene centring plates 5.2 Voltage source, consisting of a stabilized alternating source of (10,0 0,05) V. The electrical diagram is shown in Figure 4. The voltage source shall be able to maintain these voltage limits throughout the test. Figure 4 Electrical diagram 5.3
32、 Ammeter, capable of reading to the nearest 0,01 A. 6 Test specimens Select at least one pair of plates, one corrugated and one undulated, of the same length. The minimum length of the edge to be used for the test is 300 mm. Immerse the plates in the pickling solution (4.1) in a suitable container f
33、or a period of 10 min 10 s. Rinse the plates well with water and dry them. BS EN ISO 28723:2011ISO 28723:2008(E) 4 ISO 2008 All rights reserved7 Procedure Using the design drawing, determine, to the nearest 1 mm, the total (i.e. stretched) length of the edge of the corrugated or undulated test speci
34、men. NOTE The stretched edge length is the length taking into account the profiling of the corrugation and undulation of the test specimen. Determine the un-enamelled thickness of the test specimen to the nearest 0,1 mm. Position the plate in the bath (5.1) in such a way that a maximum of 10 mm of t
35、he edge to be measured (one of the edges in the flue gas direction) is immersed in the electrolyte solution (4.2). Do this within one hour after rinsing off the sulfuric acid. Connect the voltage source (5.2) between the bath electrodes and electrode L1 to the test specimen and, using the ammeter (5
36、.3), record the current automatically (3 0,5) s after switching on the test voltage. Repeat the test for the other edge of the test specimen and for the second test specimen. 8 Calculation and expression of results For each edge, calculate the uncoated surface area, a, in mm2, using the equation: a
37、= 1,222I2+ 12,903I (1) where I is the measured current, in A. Calculate the percentage free surface area, S, using the equation: 100aSbc=(2) where a is the uncoated surface area, in mm2, calculated from Equation (1); b is the stretched length of the edge of the plate, in mm; c is the thickness of th
38、e un-enamelled plate, in mm. Calculate the percentage edge covering, E, using the equation: 100E S= (3) Express the percentage edge covering as the mean of all the determinations, rounded to the nearest 0,1 %. Calculate the uncoated surface area, U, in mm2/m, using the equation: 1000aUb= (4) Express
39、 the uncoated surface area per metre length as the mean of all the determinations, rounded to the nearest 10 mm2/m. BS EN ISO 28723:2011ISO 28723:2008(E) ISO 2008 All rights reserved 59 Precision The precision of this measurement is 0,3 % of the calculated percentage edge covering and 2 mm2/m of the
40、 uncoated surface area. 10 Test report The test report shall include the following information: a) all information necessary for the identification of the sample tested; b) a reference to this International Standard, i.e. ISO 28723:2008; c) the results of the test, calculated as described in Clause
41、8, expressed as: the mean percentage edge covering, rounded to the nearest 0,1 %, the mean uncoated surface area per metre length, rounded to the nearest 10 mm2/m, and including the results of the individual determinations and the thickness of the un-enamelled plate. d) any deviations from the proce
42、dure specified; e) any unusual features (anomalies) observed during the test; f) the date of the test. This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, informati
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