1、June 2016 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 25.220.50!%VpU“2517750www.din.deDIN
2、EN ISO 28721-2Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 2: Designation and specification of resistance to chemical attack and thermal shock (ISO 28721-2:2015);English version EN ISO 28721-2:2015,English translation of DIN EN ISO 28721-2:2016-06Emails und Emaillieru
3、ngen Emaillierte Apparate fr verfahrenstechnische Anlagen Teil 2: Bezeichnung und Festlegung der chemischen und Temperaturschockbestndigkeit (ISO 28721-2:2015);Englische Fassung EN ISO 28721-2:2015,Englische bersetzung von DIN EN ISO 28721-2:2016-06maux vitrifis Appareils maills pour les installatio
4、ns industrielles Partie 2: Dsignation et spcifications de la rsistance lattaque chimique et au choc thermique (ISO 28721-2:2015);Version anglaise EN ISO 28721-2:2015,Traduction anglaise de DIN EN ISO 28721-2:2016-06SupersedesDIN EN ISO 28721-2:2011-06www.beuth.deDocument comprises 12 pagesDTranslati
5、on by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.07.16DIN EN ISO 28721-2:2016-06 2 A comma is used as the decimal marker. National foreword This document (EN ISO 28721-2:2015) has been prepared by Technical Committee ISO/TC 107 “Metallic and o
6、ther 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 DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Workin
7、g Committee NA 062-01-63 AA Prfung von Emails und Emaillierungen. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 13807 ISO 28706-2 ISO 28706-4 ISO 28721-3 DIN EN ISO 13807 DIN EN ISO 28706-2 DIN EN ISO 28706-4 DIN EN ISO 28721-3 Amendm
8、ents This standard differs from DIN EN ISO 28721-2:2011-06 as follows: a) a WARNING has been included; b) in Subclause 4.3, a NOTE concerning the minimum temperature of the drying oven has been included. Previous editions DIN 28064: 1993-08 DIN EN 15159-2: 2006-10 DIN EN ISO 28721-2: 2011-06 DIN EN
9、ISO 28721-2:2016-06 3 National Annex NA (informative) Bibliography DIN EN ISO 13807, Vitreous and porcelain enamels Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry DIN EN ISO 28706-2, Vitreous and porcelain enamels Determination of resis
10、tance to chemical corrosion Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or their vapours DIN EN ISO 28706-4, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 4: Determination of resistance to chemical co
11、rrosion by alkaline liquids using a cylindrical vessel DIN EN ISO 28721-3, Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 3: Thermal shock resistance DIN EN ISO 28721-2:2016-06 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2
12、8721-2 December 2015 ICS 25.220.50 Supersedes EN ISO 28721-2:2011English Version Vitreous and porcelain enamels Glass-lined apparatus for process plants Part 2: Designation and specification of resistance to chemical attack and thermal shock (ISO 28721-2:2015) maux vitrifis Appareils maills pour les
13、 installations industrielles Partie 2: Dsignation et spcifications de la rsistance lattaque chimique et au choc thermique (ISO 28721-2:2015) Emails und Emaillierungen Emaillierte Apparate fr verfahrenstechnische Anlagen Teil 2: Bezeichnung und Festlegung der chemischen und Temperaturschockbestndigke
14、it (ISO 28721-2:2015) This European Standard was approved by CEN on 1 November 2015. 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 a
15、nd 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
16、 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, Former Yugosl
17、av Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN D
18、E NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 28721-2:2015 EEN ISO 28721-2:2015 (E) 2 Contents Page European
19、 foreword . 3 Foreword 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Designation 6 4 Quality requirements 7 4.1 Rate of corrosion in hydrochloric acid 7 4.2 Rate of corrosion in sodium hydroxide solution . 7 4.3 Crack formation temperature 7 Bibliography 8 DIN EN ISO 28721-2:2016-06 EN ISO 2
20、8721-2:2015 (E) 3 European foreword This document (EN ISO 27821-2:2015) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the secretariat of which is held by BSI. Th
21、is 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 June 2016, and conflicting national standards shall be withdrawn at the latest by June 2016. Attention is drawn to the possibility that some of the el
22、ements 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 ISO 28721-2:2011. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the fo
23、llowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands
24、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 28721-2:2015 has been approved by CEN as EN ISO 28721-2:2015 without any modification. DIN EN ISO 28721-2:2016-06 EN ISO 28721-2:2015 (E)ForewordISO
25、(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 ISO technical committees. Each member body interested in a subject for which a technical comm
26、ittee 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 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrote
27、chnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafte
28、d in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent right
29、s. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitut
30、e an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committ
31、ee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings.This second edition of ISO 28721-2 cancels and replaces the first edition (ISO 28721-2:2008), of which it constitutes a minor revision.ISO 28721 consists of the following parts, under the general title Vitreous and
32、 porcelain enamels Glass-lined apparatus for process plants: Part 1: Quality requirements for apparatus, components, appliances and accessories Part 2: Designation and specification of resistance to chemical attack and thermal shock Part 3: Thermal shock resistance Part 4: Quality requirements for g
33、lass-lined flanged steel pipes and flanged steel fittings Part 5: Presentation and characterisation of defects4DIN EN ISO 28721-2:2016-06 EN ISO 28721-2:2015 (E)IntroductionFor many materials, the chemical composition can serve as a basis for a specification. This is not possible for chemical enamel
34、s because the composition is tied very closely to the specific enamelling technique and is therefore not disclosed by the manufacturer for competitive reasons. In order to ascribe measurable attributes to an enamel besides its general designation, the manufacturer conducts standardized tests and spe
35、cifies its enamel in terms of the resulting resistance to corrosion and thermal shock, together with a declaration of the structure of the cover coat enamel and the colour of the enamel.The quality requirements stated in this part of ISO 28721 represent the minimum requirements a chemical enamel is
36、expected to meet based on the current state of the art.5DIN EN ISO 28721-2:2016-06 WARNING This International Standard calls for the use of substances and/or procedures that may be injurious to health if adequate safety measures are not taken. This International Standard does not address any health
37、hazards, safety or environmental matters associated with its use. It is the responsibility of the user of this International Standard to establish appropriate health, safety and environmentally acceptable practices and take suitable actions for any national and International regulations. Compliance
38、with this International Standard does not of itself confer immunity from legal obligations.1 ScopeThis part of ISO 28721 specifies requirements for the resistance to chemical attack and thermal shock of chemical enamels and their designation for ordering purposes.It is applicable to enamelled appara
39、tus, piping and other components primarily used for process equipment in chemical plants.It only applies to unalloyed and low-alloy carbon steels suitable for enamelling.NOTE The main criteria for assessing enamel quality are the resistance to chemical attack and thermal shock and the structure of t
40、he cover coat enamel.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document
41、(including any amendments) applies.ISO 13807, Vitreous and porcelain enamels Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industryISO 28706-2, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 2: Determinati
42、on of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or their vapoursISO 28706-4, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 4: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vessel3
43、 DesignationThe enamel quality shall be designated by stating the following information: the rate of corrosion in hydrochloric acid, determined in accordance with ISO 28706-2; the rate of corrosion in sodium hydroxide solution, determined in accordance with ISO 28706-4; the crack formation temperatu
44、re, determined in accordance with ISO 13807;EN ISO 28721-2:2015 (E)6DIN EN ISO 28721-2:2016-06 EN ISO 28721-2:2015 (E) the structure of the cover coat enamel, e.g. all-vitreous, all-semicrystalline, vitreous on a semicrystalline intermediate layer and semicrystalline on a vitreous intermediate layer
45、; the colour of the enamel.The designation of data on quality requirements in accordance with this part of ISO 28721 shall be as follows:Enamel quality requirements in accordance with ISO 28721-2.4 Quality requirements4.1 Rate of corrosion in hydrochloric acidWhen determined in accordance with ISO 2
46、8706-2, the resistance to condensing hydrochloric acid vapour shall be equal to or less than 0,08 mm/year.4.2 Rate of corrosion in sodium hydroxide solutionWhen determined in accordance with ISO 28706-4, the rate of corrosion in sodium hydroxide solution shall be equal to or less than 0,40 mm/year.T
47、he ratio of the volume, in cubic centimetres, of the attacking sodium hydroxide solution to the area, in square centimetres, of the exposed enamel surface shall be 3,5:1.4.3 Crack formation temperatureWhen determined in accordance with ISO 13807, the crack formation temperature shall be equal to or
48、greater than 190 C.For enamels used on accessories such as agitators, baffles, thermometer wells, immersion tubes, intermediate rings, sensors and perforated plates, and also for piping accessories and pumps, a crack formation temperature of at least 170 C may be permissible.The crack formation temp
49、erature determined in accordance with ISO 13807 represents a characteristic of the specimens tested. The test result shall not, therefore, be applied directly to an apparatus or accessories.Temperature limits for thermal shock and for heating and cooling of an apparatus are given in the thermal shock diagram and the heating/cooling diagram in ISO 28721-3.NOTE The drying oven temperature has a minimum of 210 C subtracting 20 C for the quenching water temperature.7DIN EN ISO 28721-2:2016-06 E
