1、BRITISH STANDARD BS EN 12560-7:2004 Flanges and their joints Gaskets for Class-designated flanges Part 7: Covered metal jacketed gaskets for use with steel flanges The European Standard EN 12560-7:2004 has the status of a British Standard ICS 23.040.80 BS EN 12560-7:2004 This British Standard was pu
2、blished under the authority of the Standards Policy and Strategy Committee on 14 June 2004 BSI 14 June 2004 ISBN 0 580 43936 4 National foreword This British Standard is the official English language version of EN 12560-7:2004 The UK participation in its preparation was entrusted to Technical Commit
3、tee PSE/2, Jointing materials and compounds, 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
4、may be found 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. User
5、s are responsible 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,
6、 and keep the 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 18, an inside back cover and a back cover. The BSI copyright notice
7、 displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN125607 June2004 ICS23.040.80 Englishversion FlangesandtheirjointsGasketsforClassdesignatedflanges Part7:Coveredmetaljack
8、etedgasketsforusewithsteel flanges BridesetleursassemblagesJointspourlesbrides dsignesClassPartie7:Jointsmtalloplastiques revtuspourutilisationavecdesbridesenacier FlanscheundihreVerbindungenDichtungenfrFlansche mitClassBezeichnungTeil7:Metallummantelte DichtungenmitAuflagefrStahlflansche ThisEurope
9、anStandardwasapprovedbyCENon1April2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedona
10、pplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENm
11、embersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEF
12、ORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN125607:2004:EEN 12560-7:2004 (E) 2 Contents page Foreword3 1 Scope 4 2 Norma
13、tive references 4 3 Terms and definitions .4 4 Designations 4 4.1 Range of Class designations4 4.2 Range of gasket sizes .5 4.3 Gasket types.5 4.4 Information to be supplied by the purchaser .5 5 Constructional details .5 5.1 General details .5 5.2 Metal jacket.7 5.2.1 Metal jacket description 7 5.2
14、.2 Metal jacket material7 5.3 Soft filler .7 5.3.1 Soft filler description.7 5.3.2 Soft filler material.7 5.4 Covering layers8 5.4.1 Covering layers description .8 5.4.2 Covering layers material .8 5.5 Inner and outer rings.8 5.5.1 Inner and outer rings description 8 5.5.2 Inner and outer rings mate
15、rial 9 5.6 Attachment of facing .9 5.6.1 Methods of attachment .9 5.6.2 De-greasing of core .9 5.6.3 Number of joins9 5.6.4 Excessive facing9 5.7 Integrity of facing attachment 9 5.8 Construction characteristics details9 6 Dimenisons.10 7 Marking .12 8 Colour coding.13 9 Packaging .13 Annex A (infor
16、mative) Information to be supplied by the purchaser15 Annex B (informative) A-deviation16 Bibliography 18 EN 12560-7:2004 (E) 3 Foreword This document (EN 12560-7:2004) has been prepared by Technical Committee CEN/TC 74 “Flanges and their joints”, the secretariat of which is held by DIN. This Europe
17、an Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2004, and conflicting national standards shall be withdrawn at the latest by December 2004. The annex A is informative and contains “Information to be
18、 supplied by the purchaser“. The annex B is informative and contains “A-deviations“. EN 12560 consists of 7 parts: Part 1: Non-metallic flat gaskets with or without inserts Part 2: Spiral wound gaskets for use with steel flanges Part 3: Non-metallic PTFE envelope gaskets Part 4: Corrugated, flat or
19、grooved metallic and filled metallic gaskets for use with steel flanges Part 5: Metallic ring joint gaskets for use with steel flanges Part 6: Covered serrated metal gaskets for use with steel flanges Part 7: Covered metal jacketed gaskets for use with steel flanges According to the CEN/CENELEC Inte
20、rnal Regulations, 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, Nethe
21、rlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12560-7:2004 (E) 4 1 Scope This European Standard specifies the construction, dimensions and marking of covered metal jacketed gaskets for use with flanges complying with prEN 1759-1 for Class 150
22、, Class 300, Class 600, Class 900. Class 1 500 for sizes up to and including NPS 24, and for Class designation 2 500 up to and including NPS 12. This European Standard does not extend to covered metal jacketed based heat exchanger gaskets with pass bars or large vessel gaskets but, in the lack of a
23、dedicated document for such gaskets, the principles set down may be applied to them. 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 in EN 12560-1, EN 12560-2, EN 12560-3, EN 12560-4, EN 12560-5 and EN 12560-6. NOTE 2 Annex A lists i
24、nformation that should be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the supplier. 2 Normative references Not applicable. 3 Terms and definitions For the purposes of this European Standard, the follo
25、wing terms and definitions apply. 3.1 covered metal jacketed gasket consists of a sealing element with or without a location ring which may not be rigidly fixed to the sealing element NOTE The sealing element consists of a metal jacketed core and a conformable sealing material adhered both top and l
26、ower metal jacketed core surfaces. 3.2 DN see EN ISO 6708 3.3 NPS see EN 1759-3 3.4 Class see EN 1759-3 4 Designations 4.1 Range of Class designations Gaskets shall be designated as suitable for use with one or more of the following Class designations of flange: Class 150, Class 300, Class 600, Clas
27、s 900, Class 1 500 and Class 2 500. EN 12560-7:2004 (E) 5 4.2 Range of gasket sizes Gasket nominal sizes shall also be designated in accordance with the ranges specified in Tables 2 and 3. The general principles described in this standard shall be applied to gaskets outside of the ranges specified i
28、n Tables 2 and 3 by agreement between supplier and customer. 4.3 Gasket types Gasket types, as illustrated in Figure 1, shall be designated as: Type SC: Sealing element self centring (used with type C/D or E/F flange facings); Type C/I: Sealing element with inner ring (used with type C/D or E/F flan
29、ge facings); Type C/O: Sealing element with centring ring (used with type A or B flange facings); Type C/IO: Sealing element with centring ring and inner ring (used with type A or B flange facings). The type A, type B, type C/D, type E/F flange facings are specified in prEN 1759-1. 4.4 Information t
30、o be supplied by the purchaser The selection of gasket materials and type should take into account the fluid, the operating conditions and the properties of the gasket materials as well as the type of flange. It is recommended that the selection of a gasket for any particular application is made in
31、consultation with the gasket supplier who will advise on the materials required for a particular service (see annex A). 5 Constructional details 5.1 General details The covered metal jacketed gasket shall consist of a metal jacketed core and of covering layers stuck on both sides. All gasket sizes a
32、nd classes shall be designed so that an applied uniform bolt stress of 200 MPa will correctly seat the gasket and offer the required level of seal. Gaskets for which dimensions are specified shall be one of the designs shown in Figure 1. EN 12560-7:2004 (E) 6 a) Type SC b) Type C/I c) Type C/O d) Ty
33、pe C/IO Figure 1 Covered metal jacketed gaskets a) gaskets (C/O or C/IO type) for use with type A (flat face) or type B (raised face) flanges b) gaskets (SC or C/I type) for use with type C/D (tongue/groove) or type E/F (spigot/recess) flanges Key 1 Centring ring 2 Sealing element 3 Inner ring Figur
34、e 2 Examples of typical covered metal jacketed gaskets configurations EN 12560-7:2004 (E) 7 5.2 Metal jacket 5.2.1 Metal jacket description The tolerance of the inside and the outside diameters of metal jacket cross section are given in Tables 2 and 3. Thickness of the metal jacket cross section is
35、depending on the soft filler material. 5.2.2 Metal jacket material The material of the shell of the metal jacket shall be selected to be compatible with the intended service. Table 4 lists the most frequently used materials. The shell of the metal jacket shall have a thickness between 0,3 mm and 0,5
36、 mm. 5.3 Soft filler 5.3.1 Soft filler description The thickness of the soft filler material shall be selected to ensure: a good compressibility and elastic recovery of the gasket in order to compensate as much as possible the flatness defaults and to respond to variations due to operating condition
37、s; a final thickness (with covering layers) adapted with the length of the piping line (after tightening); the compatibility with the assembly specification (spigot and recess or tongue and groove, metal to metal contact, .). 5.3.2 Soft filler material The filler material shall be selected in accord
38、ance with the intended service but as guidance, satisfactory mechanical behaviour is usually obtained with the following soft filler materials: Suitable expanded graphite is: 98 % purity, ash content max. 2 %, sulphur content max. 1 000 10 -6 (ppm), halogen contents max. 50 10 -6 (ppm), the initial
39、density shall be 1,0 g/cm 3to 1,1 g/cm 3 . Suitable expanded PTFE is: Not recycled 100 % expanded PTFE, the initial density shall be 0,7 g/cm 3to 0,9 g/cm 3 . Suitable Flexible Mica is: Phlogopite Mica (content 96 %) with Silicon binder, the initial density shall be 1,8 g/cm 3to 1,9 g/cm 3 . EN 1256
40、0-7:2004 (E) 8 5.4 Covering layers 5.4.1 Covering layers description The covering layers material and thickness should be selected to be compatible: with the process fluid, and the operating conditions; the type and surface finish of the flange facings; the flange bolt loading; and to guarantee: sat
41、isfactory level of seal; a good adaptation with flange facings defaults. 5.4.2 Covering layers material As a guidance, satisfactory leaktightness is usually reached with the following covering materials: Suitable expanded graphite is: 98 % purity, ash content max. 2 %, sulphur content max. 1 000 10
42、-6 (ppm), halogen contents max. 50 10 -6 (ppm), the initial density shall be 1,0 g/cm 3to 1,1 g/cm 3 . to be finished with an anti-sticking coating Suitable Virgin PTFE is: not recycled 100 % PTFE, the initial density shall be 1,6 g/cm 3 . Suitable Expanded Vermiculite is: the initial density shall
43、be 1,2 g/cm 3 . NOTE It would be preferable that the gasket does not show any adhesion to the flange facings. 5.5 Inner and outer rings 5.5.1 Inner and outer rings description The ring thickness depend on the sealing element thickness. The rings material and thickness should be selected to be compat
44、ible: with the assembly considered (spigot and recess or tongue and groove, metal to metal contact, .), with the process fluid, and the operating conditions, EN 12560-7:2004 (E) 9 and to guarantee: protection of the sealing element against over-load sufficient load to assure good level of seal. The
45、tolerances of the inside and outside diameters of the inner and/or outer rings are given in tables 2 and 3. 5.5.2 Inner and outer rings material For the outer ring, carbon steel may be selected as standard. For the inner ring, the same material or one with better corrosion resistance than that of th
46、e metal jacket shall be selected as standard. 5.6 Attachment of facing 5.6.1 Methods of attachment An appropriate bonding adhesive shall be used (maximum chlorine levels of below 50 ppm). 5.6.2 De-greasing of core Where an adhesive is used the core shall be de-greased before use of the adhesive and
47、the amount of the adhesive used shall be minimised. 5.6.3 Number of joins In case of joins in the facing material, their number shall be minimised. 5.6.4 Excessive facing Once the sealing faces have been applied any excess material shall be removed paying particular attention that none protrudes ins
48、ide of the inner diameter of the gasket. 5.7 Integrity of facing attachment In order to ensure adequate fixation of the cover layer to the metal jacketed, it shall be ensured that the material is free from any defects such as incisions, cracks or fractures. 5.8 Construction characteristics details As a guidance, satisfactory configuration of covered metal jacketed gaskets is obtained as described in Table 1. EN 12560-7:2004 (E) 10 Table 1 Construction characteristic details General petr
