1、BRITISH STANDARDBS EN 12560-6:2003Flanges and their joints Gaskets for class-designated flanges Part 6: Covered serrated metal gaskets for use with steel flangesThe European Standard EN 12560-6:2003 has the status of a British StandardICS 23.040.80g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55
2、g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 12560-6:2003This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 22 December 2003 BSI 22 Dec
3、ember 2003ISBN 0 580 43133 9National forewordThis British Standard is the official English language version of EN 12560-6:2003.The UK participation in its preparation was entrusted to Technical Committee PSE/2, Jointing materials and compounds, which has the responsibility to: A list of organization
4、s represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence I
5、ndex”, 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 responsible for its correct application.Compliance with a British Standard does not of itself con
6、fer 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 keep the UK interests informed; monitor related international and European developments and promulg
7、ate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 15 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments
8、EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12560-6December 2003ICS 23.040.80English versionFlanges and their joints - Gaskets for Class-designated flanges -Part 6: Covered serrated metal gaskets for use with steelflangesBrides et leurs assemblages - Joints pour les bridesdsignes Class - Parti
9、e 6: Joints mtalliques strisrevtus pour utilisation avec des brides en acierFlansche und ihre Verbindungen - Dichtungen fr Flanschemit Class-Bezeichnung - Teil 6: Kammprofildichtungen frStahlflanscheThis European Standard was approved by CEN on 3 November 2003.CEN members are bound to comply with th
10、e CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to
11、 any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN
12、members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCO
13、MIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2003 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12560-6:2003 EEN 12560-6:2003 (E)2Contents pageForeword31 Scope 42
14、Normative references 43 Terms and definitions44 Designations.54.1 Range of class designations 54.2 Range of gasket sizes .54.3 Gasket types.54.4 Information to be supplied by the purchaser55 Constructional details .55.1 General details .55.2 Core .55.2.1 Core materials 55.2.2 Core welding.55.2.3 Dre
15、ssing of core welds65.2.4 Core flatness 65.3 Serrations .65.4 Location rings 65.4.1 Integral ring 65.4.2 Loose ring.65.5 Facing materials.65.6 Facing weight per unit area 65.7 Attachment of facing .75.7.1 Methods of attachment75.7.2 De-greasing of core .75.7.3 Number of joins75.7.4 Excessive facing
16、75.8 Integrity of facing attachment.75.9 Typical construction details .76 Dimensions.107 Marking .118 Colour coding.119 Packaging .11Annex A (informative) Information to be supplied by the purchaser.13Annex B (informative) The use of metric bolting with class designated covered serrated metal gasket
17、s14B.1 General14B.2 Comparable imperial & metric bolt sizes 14B.3 Gasket assembly guidance with metric bolting14B.4 Imperial/metric bolt comparisons 14Bibliography 15EN 12560-6:2003 (E)3ForewordThis document (EN 12560-6:2003) has been prepared by Technical Committee CEN/TC 74 “Flanges and theirjoint
18、s”, the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn at the latest byJune 2004.The annex A is
19、 informative and contains “Information to be supplied by the purchaser“.The annex B is informative and contains “The use of metric bolting with class designated covered serrated metalgaskets“.This document includes a Bibliography.EN 12560 consists of 7 parts:Part 1: Non-metallic flat gaskets with or
20、 without insertsPart 2: Spiral wound gaskets for use with steel flangesPart 3: Non-metallic PTFE envelope gasketsPart 4: Corrugated, flat or grooved metallic and filled metallic gaskets for use with steel flangesPart 5: Metallic ring joint gaskets for use with steel flangesPart 6: Covered serrated m
21、etal gaskets for use with steel flangesPart 7: Covered metal jacketed gaskets for use with steel flangesAccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, D
22、enmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.EN 12560-6:2003 (E)41 ScopeThis European Standard specifies the construction, dimensions and marking of covered serr
23、ated metal gaskets foruse with flanges complying with prEN 1759-1 for Class 150, Class 300, Class 600, Class 900, Class 1500 andClass 2500 up to and including NPS 24.This document does not extend to serrated covered metal based heat exchanger gaskets with pass bars or largevessel gaskets but, in the
24、 lack of a dedicated document for such gaskets, the principles set down can be applied tothem.NOTE 1 Dimensions of other types of gaskets for use with flanges to prEN 1759-1, EN 1759-3 and EN 1759-4 are given inEN 12560-1, EN 12560-2, EN 12560-3, EN 12560-4, EN 12560- 5 and prEN 12560-7.NOTE 2 Annex
25、 A lists information that should be supplied by the purchaser when ordering gaskets in circumstances wherethe choice of the gasket materials appropriate to the service is left to the supplier.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from oth
26、er publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or r
27、evision. For undated references the latest edition of thepublication referred to applies (including amendments).prEN 1759-1, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, Class-designated - Part 1: Steel flanges, NPS 1/2 to 24.EN 1759-3:2003, Flanges and th
28、eir joints Circular flanges for pipes, valves, fittings and accessories, Classdesignated Part 3: Copper alloy flanges.EN ISO 6708:1995, Pipework components Definition and selection of DN (nominal size) (ISO 6708:1995).3 Terms and definitionsFor the purposes of this European Standard, the terms and d
29、efinitions given in EN 1759-3:2003,EN ISO 6708:1995 and the following apply.3.1covered serrated metal gasketconsists of a sealing element with or without a location ring which may or may not be rigidly fixed to the sealingelement. The sealing element consists of a metal core with serrated top and lo
30、wer surfaces and a conformablesealing material adhered to each serrated surface. The serrations into metal core have the function of creatingregions of high surface pressure on the conformable sealing material to ensure the required level of tightness inservice. The density of the sealing material i
31、n the serrations during service should also be high enough to ensurethat secondary sealing is provided by the impermeable nature of the material between the tips of the serrations. Inservice the thickness of the sealing material over the serrations is minimal, often about 0,1 mm. The widths of theti
32、ps of the serrations should also be of the order of 0,1 mm3.2DNsee EN ISO 67083.3NPSsee EN 1759-33.4classsee EN 1759-3EN 12560-6:2003 (E)54 Designations4.1 Range of class designationsGaskets shall be designated as suitable for use with one or more of the following class designations of flange:Class
33、150, Class 300, Class 400, Class 600, Class 900, Class 1500 and Class 25004.2 Range of gasket sizesGasket nominal sizes shall also be designated in accordance with the ranges specified in Table 1.The general principles described in this standard shall also be applied to gaskets outside of the range
34、specified inTable 1 by agreement between supplier and customer.4.3 Gasket typesGasket types, as illustrated in Figure 1, shall be designated as:Type NR: Sealing element without any location ring.Type IR: Sealing element with integral location ring.Type LR: Sealing element with loose location ring.Ty
35、pe NR is used only with spigot faced or tongue & groove faced flanges.4.4 Information to be supplied by the purchaserThe selection of gasket materials and type should take into account the fluid, the operating conditions and theproperties of the gasket materials as well as the type of flange. It is
36、recommended that selection of a gasket for anyparticular application is made in consultation with the gasket supplier who will advise on the materials required for aparticular service (see annex A).5 Constructional details5.1 General detailsFigure 1 gives illustrations of the cores and, where used,
37、the location rings of the three types of covered serratedmetal gasket listed in 4.3.Figure 2 shows a typical covered serrated metal gasket for use with type A and type B flanges, the Type A and Bflange facings are specified in prEN 1759-1.5.2 Core5.2.1 Core materialsThe material of the core shall be
38、 selected to be compatible with the intended service. The core thickness measuredover the tips of the serrations shall be a minimum of three times the depth of the serrations.5.2.2 Core weldingIf the core is of a welded construction then the method of welding shall be such as to ensure that the weld
39、 isthroughout the full thickness of the core. The number of welds shall not be more than two.EN 12560-6:2003 (E)65.2.3 Dressing of core weldsThe welds shall be dressed to preserve the number and depth of the serrations of the rest of the core.5.2.4 Core flatnessThe out of flatness of the serrated co
40、re shall not be more than 3 mm for every 300 mm of outside diameter.5.3 SerrationsThe serration depth shall be a minimum of 0,4 mm. The pitch of the serration and the width of the serration shall bearranged so that the width of the tips is 0,1 mm. The first and last tips of the serrated core should
41、be as near aspossible to the respective edges of the core.Proprietary forms of serrations and core profiles may be used by agreement between the purchaser andmanufacturer.To reduce the possibility of vibration induced cracking of the core, the radius at the bottom of the grooves shall beas large as
42、possible.5.4 Location rings5.4.1 Integral ringThe thickness of the integral ring shall be a minimum of twice the serration depth. The location ring shall beundercut on at least one side to protect the sealing element in the event of thermal expansion induced interferencebetween the location ring and
43、 the bolts of the flange.5.4.2 Loose ringThe thickness of the location ring shall be a minimum of 0,5 mm. When installed the ring shall be sufficiently loosein the location slot in the core so that thermal expansion effects never cause the ring to become tight in the locationslot. The location ring
44、may be made in sections and assembled around the core. The sections of the assembledring shall be either welded together or otherwise securely held together. The material of the loose location ring maybe carbon steel.5.5 Facing materialsThe facing material shall be selected to be suitable for the in
45、tended service and the material of the flanges.Suitable materials range from very soft, rubber bound, sheet material to metal foils.The facing material may be cut from sheet to the appropriate size, applied in the form of texturised tape or by anyother means that meets the other requirements of this
46、 standard.5.6 Facing weight per unit areaThe weight per unit area of facing in order to create the required level of tightness in service is a function of thethickness and density of the facing material, the depth, width and pitch of the serrations, the required in servicedensity of the facing mater
47、ial and the thickness of facing required above the core in service. The weight per unitarea shall be such that metal to metal contact between the tips of the serrations and the flange surface is avoided.For guidance, a satisfactory level of sealing is routinely achieved with graphite of 0,5 mm thick
48、ness and a density of1,0 gm/cm3as received when used with a core where the serrations are 0,4 mm in depth and the serration tip widthis 0,1 mm.Ignoring the effects of the thickness of any adhesive and the grooving of the flange surfaces, the target weight perunit area of facing can be estimated from
49、 the following:EN 12560-6:2003 (E)7Weight per unit area = sr t + ( AG/ P)Where snis the required density of the facing in servicet is the required thickness in service of facing above the coreAGis the cross sectional area, perpendicular to the plane of the core, of the serrationsP is the pitch of the serrations5.7 Attachment of facing5.7.1 Methods of attachmentThe facing may be attached to the core by any means that satisfies the requirement of 5.8 provided that theattachment method does not result in the introduction of any component that is likely to initiate
