DIN EN ISO 28763-2011 Vitreous and porcelain enamels - Regenerative enamelled and packed panels for air-gas and gas-gas heat exchangers - Specifications (ISO 28763 2008) German ver.pdf

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1、June 2011 Translation by DIN-Sprachendienst.English price group 11No 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!$rX“1799053www.din.deDDIN EN ISO 28763Vitreous and porcelain enamels Regenerative, enamelled and packed panels for air-gas and gas-gasheat exchangers Specifications (ISO 28763:2008)English translation of DIN EN ISO 28763:2011-06Emails und Emaillierungen Regenerative, emaillierte und gepackt

3、e Bleche fr Luft-Gas- undGas-Gas-Wrmeaustauscher Anforderungen (ISO 28763:2008)Englische bersetzung von DIN EN ISO 28763:2011-06maux vitrifis changeurs thermiques pour rchauffeurs air-gaz et gaz-gaz empilement de panneauxmaills remplaables et dmontables Spcifications (ISO 28763:2008)Traduction angla

4、ise de DIN EN ISO 28763:2011-06SupersedesDIN EN 14866:2006-05www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1705.11 DIN EN ISO 28763:2011-06 A comma is used as the decimal marker. National foreword This standard has been prepared

5、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 Kingdom). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (M

6、aterials Testing Standards Committee), Working Committee NA 062-01-63 AA Prfung von Emails und Emaillierungen. The German term Fluten (wet flow-coating) is also referred to as Schtten or Anschtten (see 1 “Scope”). ISO 28763 was prepared by the European Committee for Standardization (CEN) as EN 14866

7、 and was adopted as ISO Standard under the “fast-track-procedure” by Technical Committee ISO/TC 107. ISO 28763 published in 2008 was then adopted by CEN/TC 262 under the “unique acceptance procedure (UAP)” as European Standard EN ISO 28763, replacing EN 14866. The DIN Standards corresponding to the

8、International Standards referred to in this document are as follows: ISO 105-J03 DIN EN ISO 105-J03 ISO 2178 DIN EN ISO 2178 ISO 4534 DIN EN ISO 4534 ISO 7991 DIN ISO 7991 ISO 8289 DIN EN ISO 8289 ISO 28706-2 DIN EN ISO 28706-2 ISO 28723 DIN EN ISO 28723 ISO 28764 DIN EN ISO 28764 Amendments This st

9、andard differs from DIN EN 14866:2006-05 as follows: a) the number of the standard has been changed; b) the standard has been editorially revised. Previous editions DIN EN 14866: 2006-03, 2006-05 2 DIN EN ISO 28763:2011-06 National Annex NA (informative) Bibliography DIN EN ISO 105-J03, Textiles Tes

10、ts for colour fastness Part J03: Calculation of colour differences DIN EN ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness by the magnetic method DIN EN ISO 4534, Metallic and other inorganic coatings Vitreous and porcelain enamels Determination of fluidity beh

11、aviour Fusion flow test DIN EN ISO 8289, Vitreous and porcelain enamels Low voltage test for detecting and locating defects DIN EN ISO 28706-2, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 2: Determination of resistance to chemical corrosion by boiling acids,

12、 boiling neutral liquids and/or their vapours DIN EN ISO 28723, Vitreous and porcelain enamels Determination of the edge covering on enamelled steel plate to be used in heat exchangers DIN EN ISO 28764, Vitreous and porcelain enamels Production of specimens for testing enamels on sheet steel, sheet

13、aluminium and cast iron DIN ISO 4534, Vitreous and porcelain enamels Determination of fluidity behaviour Fusion flow test DIN ISO 7991, Glass Determination of coefficient of mean linear thermal expansion 3 DIN EN ISO 28763:2011-06 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE

14、EUROPISCHE NORM EN ISO 28763 March 2011 ICS 25.220.50 Supersedes EN 14866:2005English Version Vitreous and porcelain enamels Regenerative, enamelled and packed panels for air-gas and gas-gas heat exchangers Specifications (ISO 28763:2008) maux vitrifis changeurs thermiques pour rchauffeurs air-gaz e

15、t gaz-gaz empilement de panneaux maills remplaables et dmontables Spcifications (ISO 28763:2008) Emails und Emaillierungen Regenerative, emaillierte und gepackte Bleche fr Luft-Gas- und Gas-Gas-Wrmeaustauscher Anforderungen (ISO 28763:2008) This European Standard was approved by CEN on 3 March 2011.

16、 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 standards may be obtained on

17、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 a CEN member into its own language and notified to the CEN-CENELE

18、C 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, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, N

19、etherlands, 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: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitati

20、on in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 28763:2011: EContents Page Foreword .3 1 Scope 4 2 Normative references4 3 Terms and definitions .54 Steel substrates.6 4.1 Delivery.6 4.2 Analysis 6 4.3 Hydrogen permeability6 4.4 Fish scale test6 4.5 Pickl

21、ing speed7 5 Enamel frit(s)7 5.1 Delivery.7 5.2 Coefficient of expansion.7 5.3 Fusion flow.7 5.4 Boiling water vapour resistance 7 5.5 Acid resistance 7 5.6 Thermal shock resistance 8 5.7 Adherence 8 6 Characteristics of the enamel coating 8 6.1 Adherence 8 6.2 Thickness .8 6.3 Thermal shock resista

22、nce 9 6.4 Fundamental defects.9 6.5 Open defects10 6.6 Edge covering of gas-gas heaters.10 6.7 Boiling sulphuric acid resistance 10 6.8 Rework10 7 Characteristics after packing .11 7.1 Packing pressure.11 7.2 Visual examination 11 7.3 Edge covering of gas-gas heaters.11 8 Documentation.11 Annex A (n

23、ormative) Method for determining thermal shock resistance of vitreous or porcelain enamel coatings.13 2EN ISO 28763:2011 (E) DIN EN ISO 28763:2011-06 Foreword The text of ISO 28763:2008 has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” of the International O

24、rganization for Standardization (ISO) and has been taken over as EN ISO 28763:2011 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 i

25、dentical text or by endorsement, at the latest by September 2011, and conflicting 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

26、be held responsible for identifying any or all such patent rights. This document supersedes EN 14866:2005. 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, Cro

27、atia, 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, Sweden, Switzerland and the United Kingdom. Endorsement notice The text

28、 of ISO 28763:2008 has been approved by CEN as a EN ISO 28763:2011 without any modification. 3EN ISO 28763:2011 (E) DIN EN ISO 28763:2011-06 1 Scope This International Standard specifies the minimum requirements and the functional characteristics of enamel coatings applied by any process, such as we

29、t dipping, wet flow-coating, wet spraying, wet electrostatic spraying, wet electrodeposition or dry-powder electrostatic spraying, to profiled steel heat exchanger panels in regenerative heat exchangers, before and after packing in baskets. For very severe service conditions, or to obtain extended o

30、perational life, more stringent limits may be agreed between customer and supplier. 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 edition of th

31、e referenced document (including any amendments) applies. ISO 105-J03, Textiles Tests for colour fastness Part J03: Calculation of colour differences (including Technical Corrigendum 1:1996 and Technical Corrigendum 2:2006) ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coatin

32、g thickness Magnetic method ISO 4534, Vitreous and porcelain enamels Determination of fluidity behaviour Fusion flow test ISO 7991, Glass Determination of coefficient of mean linear thermal expansion ISO 8289:2001, Vitreous and porcelain enamels Low voltage test for detecting and locating defects IS

33、O 28706-2:2008, 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 vapours ISO 28723, Vitreous and porcelain enamels Determination of the edge covering on en

34、amelled steel plate to be used in heat exchangers ISO 28764, Vitreous and porcelain enamels Production of specimens for testing enamels on sheet steel, sheet aluminium and cast iron EN 10204:2004, Metallic products Types of inspection documents EN 10209:1996, Cold rolled low carbon steel flat produc

35、ts for vitreous enamelling Technical delivery conditions 4EN ISO 28763:2011 (E) DIN EN ISO 28763:2011-06 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 blisters localized bubbles under the surface of the fired enamel 3.2 burn-off localized a

36、reas of rough black oxide erupting through the enamel coating 3.3 chipping fracturing and detachment of particles from a vitreous enamelled surface 3.4 copperheads small freckle-like or pimple-like reddish-brown spots occurring in ground-coats or in direct-on enamels applied to sheet metals 3.5 crac

37、king laminar interruptions in the fused coating usually running vertical to the surface NOTE 1 The laminar interruptions can also occur at different angles. NOTE 2 Their causes are mainly the result of tensile stresses within the enamel coating. 3.6 crazing fine cracks in the enamel coating 3.7 fire

38、 tool marks fire marks small indentations similar in appearance to shallow pinholes 3.8 fish-scaling small half-moon-shaped defects occurring in the vitreous enamelled surface NOTE Fish-scaling can occur immediately on cooling or after some time has elapsed following firing. These defects originate

39、from supersaturation of the substrate with hydrogen (acquired during firing) that suddenly fractures the enamel coating in order to relieve the pressure that has accumulated with time at the enamel-steel interface. 3.9 spalling spontaneous fracturing and detachment of particles of enamel from within

40、 the coating layer NOTE Spalling often occurs on corners, sharp radii or panel edges and is the result of too low an enamel coefficient of expansion for the substrate, the external radii and the enamel thickness concerned. Thermal stresses can aggravate the spalling. 3.10 tearing short breaks or cra

41、cks in the enamel bisque that have healed during firing 5EN ISO 28763:2011 (E) DIN EN ISO 28763:2011-06 3.11 air-gas heater heat exchanger used to heat up the air needed for combustion in the boiler, using the combustion gases from the boiler as the hot fluid NOTE 1 The maximum temperature of the ho

42、t gases entering the heat exchanger is 450 C with a normal operating temperature from 380 C to 320 C. NOTE 2 Air-gas heat exchangers through which gases from DeNOx installations pass are considered as gas-gas heaters for the purposes of this International Standard. 3.12 gas-gas heater heat exchanger

43、 used in desulfuration plants to reheat the gases treated in the scrubber to obtain the proper draft in the stack NOTE 1 The hot gases are the untreated gases going to the scrubber. NOTE 2 The maximum temperature of the hot gases entering the heat exchanger is 200 C with a normal operating temperatu

44、re from 160 C to 120 C. 4 Steel substrates 4.1 Delivery The steel for enamelling shall conform to the requirements of EN 10209 and shall be delivered with a certificate in accordance with 3.1 of EN 10204:2004. 4.2 Analysis The chemical composition shall be determined by a ladle analysis and shall co

45、nform to the requirements of EN 10209:1996, Table 2. At the request of the enameller, other elements as mentioned in Table 2 of EN 10209:1996 shall be agreed with the steel manufacturer. For grades DCO3ED and DCO4ED, the carbon content of the product shall be determined and shall conform to EN 10209

46、:1996, Table 2. 4.3 Hydrogen permeability The hydrogen permeability shall have a minimum TH value of 100, calculated in accordance with EN 10209:1996, B.1.8, Equation (1), or shall give the result of a minimum of 8 min in accordance with EN 10209:1996, B.1, calculated in accordance with B.1.8, Equat

47、ion (2). In the absence of a certificate from the steel supplier confirming the above minimum hydrogen permeability, and with prior agreement between the customer and the supplier, the fish-scale resistance shall then be determined as described in 4.4. The hydrogen permeability method is not accepta

48、ble for the steel grades DCO6EK and DCO6ED (see EN 10209:1996, Table 2). For these grades, the fish-scale test described in 4.4 shall be used. 4.4 Fish-scale test The fish-scale test shall be carried out in accordance with EN 10209:1996, B.2, method B.2. The test sheet (150 mm coil width) shall be pre-treated without a nickel dip. The front and back shall be coated with enamel prepared in accordance with the suppliers milling formula and a