1、CEN EN*ISO*b708 35 3404589 0320423 T55 BRITISH STANDARD Pipework components - Definition and selection of DN (nominal size) The European Standard EN IS0 6708 : 1995 has the status of a British Standard ICs 23.040.00 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 670
2、8 : 1996 CEN EN*ISO*b08 95 3404589 OL2042Y 991 BS EN IS0 6708 : 1996 Committees responsible for this British Standard 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
3、British Foundry Association British Iron and Steel Producers? Association British Malleable Tube Fittings Association British Maritime Technology British Non-Ferrous Metals Federation British Plumbing Fittings Manufacturers? Association British Pump Manufacturers? Association British Valve and Actua
4、tor Manufacturers? Association Copper Development Association Energy Industries Council Engineering Equipment and Materials Users? Association GAMBICA (BEAMA Ltd.) Institution of Chemical Engineers Power Generation Contractors? Association (PGCA) (BEAMA Ltd.) Water Services Association of England an
5、d Wales This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1996 O BSI 1996 Amendments issued since publication Amd. No* I Date I Text affected The following BSI re
6、ferences relate to the work on this standard: Committee reference PSE/15 Draft for comment 93/710975 DC ISBN O 580 24946 8 CEN EN*ISO*b7Q 95 3404589 OL20425 828 BS EN IS0 6708 : 1996 Contents Committees responsible National foreword Page Inside front cover 11 Foreword 1 Scope 2 Definition 3 DN Serie
7、s O BSI 1996 1 CEN EN*ISO*b708 95 3404589 0120426 764 m BS EN IS0 6708 : 1996 National foreword This British Standard has been prepared by Technical Committee PSE/15 and is the English language version of EN IS0 6708 : 1995 Pipework componunts - Definition and selection of DN (nominal size), publish
8、ed by the European Committee for Standardization (GEN). It is identical with IS0 6708 : 1995, published by the International Organization for Standardization (ISO). Compliance with a British Standard does not of itself confer immunity from legal obligations. ii O BSI 1996 CEN EN*IS0*6708 95 3404589
9、0320427 bTO M EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 6708 July 1995 ICs 23.040.00 Descriptors: piping, components, diameters, size designation, numerical designations, definitions, selection English version Pipework components - Definition and selection of DN (nominal size) (IS0 67
10、08 : 1995) Composants de rseau de tuyauteries - Dfinition et slection des DN (diamtre nominal) (IS0 6708 : 1995) Rohrleitungsteile - Definition und Auswahl von DN (Nennweite) (IS0 6708 : 1995) This European Standard was approved by CEN on 1995-06-12. CEN members are bound to comply with the CENICENE
11、LEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any C
12、EN member. This European Standard ex!?ts in three official versions (English, French, German). A version in any other language made by translation under 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
13、members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europ
14、isches Komitee fr Normung Central Secretariat: rue de Stassart 36. B- 1050 Brussels O 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN IS0 6708 : 1995 E CEN EN*ISO*b708 95 3404589 OL20Y28 537 H Page 2 EN IS0
15、6708 : 1995 Foreword The text of the international standard IS0 6708 : 1995 has been prepared by Technical Committee ISO/C 5 Ferrous metal pipes and metallic fittings in collaboration with CEN/TC 74 Flanges and their joints. This European Standard shall be given the status of a national standard, ei
16、ther 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 CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria
17、, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. O BSI 1996 Page 3 EN IS0 6708 : 1995 Pipework components - Definition and selection of DN (nominal size) 1 Scope This International
18、 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. NOTE 1 Other methods of size designation are also used, e g products having threaded, compression, solder or welded end connection
19、s or products designated by NPS (nominal pipe size), OD (outside diameter), ID (inside diam- eter), but these are not defined in this International Stan- dard This International Standard gives a list of preferred DN values. 2 Definition 2.1 DN: An alphanumeric designation of size for components of a
20、 pipework system, which is used for reference purposes. It comprises the letters DN fol- lowed by a dimensionless whole number which is in- directly related to the physical size, in millimetres, of the bore or outside diameter of the end connections. NOTES 2 The number following the letters DN does
21、not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard. 3 In those standards which use the DN designation sys- tem, any relationship between DN and component dimen- sions should be given, e.g. DN/OD or DN/ID. 3 DN Series The p
22、referred DN values are as follows: DN 10 DN 15 DN 20 DN 25 DN 32 DN 40 DN 50 DN 60 DN 65 DN 80 DN 100 DN 125 DN 150 DN 200 DN 250 DN 300 DN 350 DN 400 DN 450 DN 500 DN 600 DN 700 DN 800 DN 900 DN 1 O00 DN 1 100 DN 1 200 DN 1 400 DN 1 500 DN 1 600 DN 1 800 DN 2 O00 DN 2 200 DN 2 400 DN 2 600 DN 2 800
23、 DN 3 O00 DN 3 200 DN 3 400 DN 3 600 DN 3 800 DN 4 O00 8 BSI 1996 CEN EN*ISO*b708 95 3404589 OI120430 195 BS EN IS0 6708 : 1996 BSI 389 Chiswick High Road London W4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents t
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32、purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager, BSI, 389 Chiswick High Road, London W4 4AL. %I: 0181 996 7111; PdX: 0181 996 7048. ISBN O 580 24946 8 PSE!16
