1、BRITISH STANDARD BS EN ISO 6708:1996 Pipework components Definition and selection of DN (nominal size) The European Standard EN ISO6708:1995 has the status of a British Standard ICS 23.040.00BSENISO6708:1996 This British Standard, having been prepared under the directionof the Engineering SectorBoar
2、d, was published underthe authority of the Standards Board and comes intoeffect on 15 march 1996 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PSE/15 Draft for comment 93/710975 DC ISBN 0 580 24946 8 Committees responsible for this British Standard
3、 The preparation of this British Standard was entrusted to Technical Committee PSE/15, Flanges, upon which the following bodies were represented: British Compressed Gases Association British Foundry Association British Iron and Steel Producers Association British Malleable Tube Fittings Association
4、British Maritime Technology British Non-Ferrous Metals Federation British Plumbing Fittings Manufacturers Association British Pump Manufacturers Association British Valve and Actuator Manufacturers Association Copper Development Association Energy Industries Council Engineering Equipment and Materia
5、ls Users Association GAMBICA (BEAMA Ltd.) Institution of Chemical Engineers Power Generation Contractors Association (PGCA) (BEAMA Ltd.) Water Services Association of England and Wales Amendments issued since publication Amd. No. Date CommentsBSENISO6708:1996 BSI 07-1999 i Contents Page Committees r
6、esponsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Definition 3 3 DN Series 3BSEN ISO6708:1996 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee PSE/15 and is the English language version of EN ISO6708:1995 Pipework components Defi
7、nition and selection of DN (nominal size), published by the European Committee for Standardization (CEN). It is identical with ISO6708:1995, published by the International Organization for Standardization (ISO). A British Standard does not purport to include all the necessary provisions of a contrac
8、t. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 and 3 an
9、d a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO6708 July 1995 ICS 23.040.00 Descriptors: Piping, components,
10、diameters, size designation, numerical designations, definitions, selection English version Pipework components Definition and selection of DN (nominal size) (ISO6708:1995) Composants de rseau de tuyauteries Dfinition et slection des DN (diamtrenominal) (ISO6708:1995) Rohrleitungsteile Definition un
11、d Auswahl von DN (Nennweite) (ISO6708:1995) This European Standard was approved by CEN on1995-06-12. 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
12、-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 und
13、er the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherl
14、ands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and b
15、y any means reserved in all countries to CEN and its members. Ref. No. EN ISO6708:1995 EENISO6708:1995 2 BSI 07-1999 Foreword The text of the international standard ISO6708:1995 has been prepared by Technical Committee ISO/TC 5 “Ferrous metal pipes and metallic fittings” in collaboration with CEN/TC
16、 74 “Flanges and their joints”. This 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 January 1996, and conflicting national standards shall be withdrawn at the latest by January 1996. According to CEN/
17、CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom.ENISO6708:1995 BSI 07-199
18、9 3 1 Scope This International Standard gives the definition of DN (nominal size) when applied to components of a pipework system, as specified in those standards which use the DN designation system. NOTE1Other methods of size designation are also used, e.g. products having threaded, compression, so
19、lder or welded end connections or products designated by NPS (nominal pipe size), OD (outside diameter), ID (inside diameter), but these are not defined in this International Standard. This International Standard gives a list of preferred DN values. 2 Definition 2.1 DN an alphanumeric designation of
20、 size for components of a pipework system, which is used for reference purposes. It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections NOTE 2The number following th
21、e letters DN does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard. NOTE 3In those standards which use the DN designation system, any relationship between DN and component dimensions should be given, e.g. DN/OD or DN/ID.
22、 3 DN Series The preferred DN values are as follows: DN10 DN250 DN1500 DN15 DN300 DN1600 DN20 DN350 DN1800 DN25 DN400 DN2000 DN32 DN450 DN2200 DN40 DN500 DN2400 DN50 DN600 DN2600 DN60 DN700 DN2800 DN65 DN800 DN3000 DN80 DN900 DN3200 DN100 DN1000 DN3400 DN125 DN1100 DN3600 DN150 DN1200 DN3800 DN200 D
23、N1400 DN4000BS ENISO 6708:1996 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.
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