1、June 2011 Translation by DIN-Sprachendienst.English price group 8No 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 25
2、.220.50!$s2“1801561www.din.deDDIN EN ISO 28721-3Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 3: Thermal shock resistance (ISO 28721-3:2008)English translation of DIN EN ISO 28721-3:2011-06Emails und Emaillierungen Emaillierte Apparate fr verfahrenstechnische Anlagen T
3、eil 3: Temperaturschockbestndigkeit (ISO 28721-3:2008)Englische bersetzung von DIN EN ISO 28721-3:2011-06maux vitrifis Appareils maills pour les installations industrielles Partie 3: Rsistance au choc thermique (ISO 28721-3:2008)Traduction anglaise de DIN EN ISO 28721-3:2011-06SupersedesDIN EN 15159
4、-3:2006-10www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1306.11 DIN EN ISO 28721-3:2011-06 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 107 “Metallic and
5、 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 (Materials Testing Standards Committee), Working
6、Committee NA 062-01-63 AA Prfung von Emails und Emaillierungen. 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: Des
7、ignation and specification of resistance to chemical attack and thermal shock Part 3: Thermal shock resistance The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 28721-1 DIN EN ISO 28721-1 Amendments This standard differs from DIN EN 15159-3:
8、2006-10 as follows: a) the number of the standard has been changed; b) the standard has been editorially revised. Previous editions DIN 28065: 1993-08 DIN EN 15159-3: 2006-10 National Annex NA (informative) Bibliography DIN EN ISO 28721-1, Vitreous and porcelain enamels Glass-lined apparatus for pro
9、cess plants Part 1: Quality requirements for apparatus, components, appliances and accessories EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28721-3 April 2011 ICS 25.220.50 Supersedes EN 15159-3:2006English Version Vitreous and porcelain enamels - Glass-lined apparatus for process plants
10、 - Part 3: Thermal shock resistance (ISO 28721-3:2008) maux vitrifis - Appareils maills pour les installations industrielles - Partie 3: Rsistance au choc thermique (ISO 28721-3:2008) Emails und Emaillierungen - Emaillierte Apparate fr verfahrenstechnische Anlagen - Teil 3: Temperaturschockbestndigk
11、eit (ISO 28721-3:2008) 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 an
12、d 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 any other language made by translation under the
13、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 Republic, Denmark, Estonia, Finland, France, German
14、y, 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 NORMALISATION EUROPISCHES KOMITEE FR NORMUNG M
15、anagement 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 28721-3:2011: EContents DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 2 Page Foreword3 1 Scope 4 2 Terms and definiti
16、ons .4 3 Thermal shock diagram 5 4 Heating/cooling diagram.7 5 Quality designation9 Annex A (informative) Explanatory notes.10 Bibliography 11 Foreword The text of ISO 28721-3:2008 has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” of the International Organi
17、zation for Standardization (ISO) and has been taken over as EN ISO 28721-3:2011 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 iden
18、tical 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 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
19、 responsible for identifying any or all such patent rights. This document supersedes EN 15159-3:2006. 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,
20、 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 of I
21、SO 28721-3:2008 has been approved by CEN as a EN ISO 28721-3:2011 without any modification. DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 3 1 Scope This part of ISO 28721 specifies requirements for the thermal shock resistance of, and heating and cooling procedures for, glass-lined apparatus, c
22、omponents, accessories and pipes primarily used for process equipment in chemical plants. It specifies the limits of thermal shock resistance using diagrams (see Figure 1 and Figure 2). For glass-lined steel, a distinction is made between a thermal shock on the glass-lined side (produced by charging
23、 an apparatus) and a thermal shock on the steel side (produced by heating or cooling an apparatus). This part of ISO 28721 applies to operating temperatures from 25 C to + 230 C. It is only applicable to enamelled unalloyed and low-alloy carbon steels. 2 Terms and definitions For the purposes of thi
24、s document, the following terms and definitions apply. 2.1 glass-lined steel composite material produced by smelting a vitreous and porcelain enamel coat onto a steel substrate 2.2 shock medium substance (e.g. steam, an aqueous liquid or a solid) having a higher or lower temperature than that of the
25、 enamel and thus causing a sudden temperature change when brought into contact with the glass-lined surface 2.3 thermal shock sudden change of temperature, either on the glass-lined side or on the steel side of an enamelled steel item, resulting from contact with a shock medium 2.4 wall temperature
26、TWaverage steel temperature, in degrees Celsius, of the enamel NOTE The wall temperature is often equivalent to the temperature of the heating or cooling medium entering the jacket of the apparatus. DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 4 2.5 product temperature TPtemperature, in degree
27、s Celsius, of the product which is inside the apparatus and in contact with the glass-lined surface or is to be introduced into the apparatus 2.6 temperature of heating or cooling medium THCtemperature, in degrees Celsius, of the medium (e.g. water, steam, heat-transfer oil) which is introduced into
28、 the jacket of an apparatus for heating or cooling purposes NOTE Where steam is the heating medium, the temperature of the heating or cooling medium is the condensation temperature at the particular pressure in the jacket of the apparatus. EXAMPLE For saturated steam at an overpressure of 0,6 MPa, T
29、HC= 165 C. 3 Thermal shock diagram The thermal shock diagram (see Figure 1) defines the thermal shock limits for a shock medium brought into contact with the glass-lined surface of an apparatus e.g. when a product is introduced into the apparatus and the heating or cooling medium is in a half-pipe c
30、oil (or other) jacket. These thermal shock limits depend on the wall temperature, TW, and the product temperature, TP. NOTE The values defined in the diagram were calculated assuming essentially infinitely high heat-transfer coefficients which are found to be approximately the case with aqueous shoc
31、k media. Tables 1 and 2 give examples showing the corresponding wall temperature and minimum and maximum product temperatures. If the product (e.g. a gas, solid or highly viscous fluid) has a relatively low heat-transfer coefficient, higher thermal shock limits are permitted by agreement with the ma
32、nufacturer (see Annex A). DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 5 Key X wall temperature, TW(C) Y product temperature, TP(C) Figure 1 Thermal shock diagram for examples 1 to 8 (see Tables 1 and 2) (thermal shock on the glass-lined side of the steel) Table 1 Introducing a hot product int
33、o a cold apparatus Wall temperature TWMaximum product temperature TP(rounded) Example C C 1 20 130 2 0 150 3 20 165 4 40 180 DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 6 Table 2 Introducing a cold product into a hot apparatus Wall temperature TWMinimum product temperature TP(rounded) Example
34、 C C 5 120 25 6 140 5 7 160 20 8 180 50 4 Heating/cooling diagram The heating/cooling diagram (see Figure 2) defines the thermal shock limits for a shock medium brought into contact with the steel side of the enamelled wall e.g. when a heating or cooling medium is introduced into the half-pipe coil
35、(or other) jacket of an apparatus filled with a product. These thermal shock limits depend on the temperature of the heating or cooling medium, THC, and of the product, TP. NOTE The values defined in the diagram were calculated assuming essentially infinitely high temperature transfer coefficients f
36、or both the product and the heating or cooling medium. Such coefficients are found to be approximately the case with aqueous products, with steam used as a heating medium and with water used as a cooling medium. If the product (e.g. a gas, solid or highly viscous fluid) has a relatively low heat-tra
37、nsfer coefficient, higher thermal shock limits for heating are permitted by agreement with the manufacturer. If relatively low heat-transfer coefficients prevail in the jacket (e.g. if heat-transfer oil is used as the shock medium instead of condensing steam or water), thermal shock limits wider tha
38、n those shown in Figure 2 are permitted by agreement with the manufacturer (see Annex A). Tables 3 and 4 give examples showing the corresponding product temperature and maximum heating or minimum cooling temperatures. DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 7 Key X product temperature, TP
39、(C) Y temperature of heating or cooling medium, THC(C) Figure 2 Diagram for heating and cooling for examples 9 to 16 (see Tables 3 and 4) (thermal shock on the steel side of the enamel) Table 3 Introducing a heating medium into the half-pipe coil (or other) jacket of a cold apparatus Product tempera
40、ture TPMaximum temperature of heating medium THC(rounded) Example C C 9 20 125 10 0 145 11 20 165 12 40 175 DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 8 Table 4 Introducing a cooling medium into the half-pipe coil (or other) jacket of a hot apparatus Product temperature TPMinimum temperature
41、 of cooling medium THC(rounded) Example C C 13 120 20 14 140 0 15 160 20 16 180 40 If the intended temperature change exceeds the limits in the diagram (see Figure 2), this operation shall be carried out in steps. EXAMPLE Heating a cold apparatus containing a product at a temperature of 0 C using sa
42、turated steam at a temperature of 165 C: First step: Introduce steam at a pressure of 0,3 MPa into the jacket until the product temperature exceeds 25 C. Second step: Switch to steam at a pressure of 0,6 MPa and heat until the product temperature reaches 165 C. 5 Quality designation Glass-lined stee
43、l apparatus, components and pipes conforming to this part of ISO 28721 shall be designated as follows: Resistance to thermal shock in accordance with ISO 28721-3. DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 9 Annex A (informative) Explanatory notes The thermal shock resistance of a glass-line
44、d apparatus depends on several different factors, such as the physical properties of the enamel, the material characteristics of the steel, the design of the apparatus, the enamelling process used and the service conditions. The data on thermal shock resistance given in this part of ISO 28721 apply
45、to most glass-lined apparatus in service, based on the following general conditions: a) Apparatus design in accordance with ISO 28721-1; design of flanged pipes and flanged fittings in accordance with DIN 2873 (a permitted operating pressure from 0,1 MPa to + 0,6 MPa and a permitted operating temper
46、ature from 25 C to 230 C inside the apparatus or jacket). b) Base material is unalloyed or low-alloy carbon steel which can be glass-lined with a minimum yield strength of 210 N/mm2. In many cases, this value determines the thermal shock limits for heating and cooling as shown in Figure 2. c) The ap
47、paratus and the pipe fittings comply with the quality requirements specified in ISO 28721-1. d) At the moment of the thermal shock, the pressure in the apparatus and in the jacket is in the range 0,1 MPa to + 0,6 MPa. Deviations from these general conditions or from any other specifications given in
48、 this part of ISO 28721 can restrict or extend the limits in both the thermal shock diagram and the heating/cooling diagram. In such cases, a special agreement will be necessary between the manufacturer and the user before the apparatus concerned is put into service. DIN EN ISO 28721-3:2011-06 EN ISO 28721-3:2011 (E) 10 Bibliography 1 ISO 28721-1, Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 1: Quality requirements for apparatus, c
