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1、BRITISH STANDARD BS EN 14863:2005 Vitreous and porcelain enamels Determination of the edge covering on enamelled steel plate to be used in heat exchangers The European Standard EN 14863:2005 has the status of a British Standard ICS 25.220.50 ? BS EN 14863:2005 This British Standard was published und
2、er the authority of the Standards Policy and Strategy Committee on 17 February 2006 BSI 17 February 2006 ISBN 0 580 46949 2 National foreword This British Standard is the official English language version of EN 14863:2005. The UK participation in its preparation was entrusted to Technical Committee
3、STI/36, Vitreous enamel coatings, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be foun
4、d in the BSI Catalogue under the section entitled “ International Standards Correspondence Index” , or by using the “ Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are re
5、sponsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and kee
6、p UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in
7、 this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14863 December 2005 ICS 25.220.50 English Version Vitreous and porcelain enamels - Determination of the edge covering on enamelle
8、d steel plate to be used in heat exchangers maux vitrifis - Dtermination du revtement de larte sur une plaque en acier maill destine aux changeurs de chaleur Emails und Emaillierungen - Bestimmung der Kantenabdeckung von emaillierten Stahlblechen fr Wrmeaustauscher This European Standard was approve
9、d by CEN on 4 November 2005. 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 references concerning such national s
10、tandards may be obtained on application to the Central Secretariat 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 a CEN member into its own language and notified
11、 to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands
12、, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form an
13、d by any means reserved worldwide for CEN national Members. Ref. No. EN 14863:2005: E EN 14863:2005 (E) 2 ContentsPage Foreword 3 1Scope.4 2Normative references .4 3Principle.4 4Reagents and materials4 5Apparatus4 6Test specimens.7 7Procedure7 8Calculation and expression of results.7 9Accuracy8 10Te
14、st report.8 ? EN 14863:2005 (E) 3 Foreword This European Standard (EN 14863:2005) has been prepared 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
15、 publication of an identical text or by endorsement, at the latest by June 2006, and conflicting national standards shall be withdrawn at the latest by June 2006. WARNING The use of this European Standard may involve hazardous materials, operations and equipment. This European Standard does not purp
16、ort to address all of the safety problems associated with its use. It is the responsibility of the user of this European Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. According to the CEN/CENELEC Internal Regulat
17、ions, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
18、ay, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. ? EN 14863:2005 (E) 4 1 Scope This European 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
19、 all enamelling processes. It is applicable to plates with a thickness between 0,5 mm and 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 European S
20、tandard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3693:1987) 3 Principle The edge of an enamelle
21、d steel plate to be tested is submerged in a fluid electrolyte. An alternating 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 o
22、f recognized analytical grade and distilled or de-mineralized water or water of equivalent. 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 ch
23、loride solution, 5 % NaCl by mass, made with distilled water conforming to grade 3 of EN ISO 3696, at a temperature of (22 3) C. 5 Apparatus 5.1 Test bath, consisting of a polypropylene container holding electrolyte solution in which the electrodes and a test plate are placed. Polypropylene plates a
24、re 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. ? EN 14863:2005 (E) 5 Key 1 Plate to be tested 2 Plates for centring and lifting the test plate from the bottom. Dimens
25、ions in millimetres Figure 1 Dimensions of the test bath Key 1 Electrodes (1264 mm long) 2 NaCl solution Dimensions in millimetres 1 24 94 80 2 Figure 2 Dimensions of the two stainless steel electrodes (EN 10088-1 grade 1.4301) ? EN 14863:2005 (E) 6 Dimensions in millimetres 80 94 10 10 Figure 3 Dim
26、ensions 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. NOTEThis voltage source should be able to maintain these voltage limits throughout the test. A V 0 L1 Figure 4 Electrical
27、diagram 5.3 Ammeter, capable of reading to the nearest 0,01 A. ? EN 14863:2005 (E) 7 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 solutio
28、n (4.1) in a suitable container for a period of 10 min 10 s. Rinse the plates well with water and dry them. 7 Procedure Using the design drawing, determine to the nearest 1 mm the total or stretched edge length of the corrugated or undulated test specimen. NOTE The stretched edge length is the lengt
29、h 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 a plate in the bath (5.1) in such a way that a maximum of 10 mm of the edge to be measured (one of the edges in the fl
30、ue 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 (5.3), record the current automatically (3 0,5) s af
31、ter 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 = 1,222I2 + 12,903I(1) where I is the measured curr
32、ent in A. Calculate the percentage free surface area S using the equation: 100 cb a S =(2) where ais the uncoated surface area in mm2, calculated from Equation (1); b is the stretched edge length plate in mm; c is the thickness of the un-enamelled plate in mm. Calculate the percentage edge covering,
33、 E, using the equation: SE=100(3) ? EN 14863:2005 (E) 8 Express the percentage edge covering as the mean of all determinations, rounded to the nearest 0,1 %, reporting the results of all determinations. Calculate the uncoated surface area U, in mm2/m, using the equation: 1000 b a U =(4) Express the
34、uncoated surface area per metre length, as the mean of all determinations, rounded to the nearest 10 mm2/m. 9 Accuracy The accuracy of this measurement is 0,3 % of the calculated percentage edge covering and 2 mm2/m of the uncoated surface area. 10 Test report The test report shall include the follo
35、wing information: a) all information necessary for identification of the sample tested; b) reference to this European Standard, i.e. EN 14863:2005; c) results of the test calculated as described in Clause 8, expressed as: mean percentage edge covering, rounded to the nearest 0,1 %; mean uncoated sur
36、face area per metre length, rounded to the nearest 10 mm2/m; including the results of the individual determinations the thickness of the un-enamelled plate. d) any deviations from the procedure specified; e) any unusual features (anomalies) observed during the test; f) date of the test. ? blank ? BS
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