1、DEUTSCHE NORM SeDtember 1995 Pipework components English version of DIN EN IS0 6708 Definition and selection of DN (nominal size) DIN EN IS0 6708 ICs 23.040.00 Descriptors: Pipework, nominal size. Rohrleitungsteile; Definition und Auswahl von DN (Nennweite) Supersedes parts of DIN 2402, February 197
2、6 edition. European Standard EN IS0 6708: 1995 has the status of a DIN Standard. National foreword This standard has been prepared by CEN/TC 74. The responsible German body involved in its preparation was the Normenausschu Rohre, Rohrverbindungen und Rohr- leitungen (Pipes, Pipe Joints and Pipelines
3、 Standards Committee), Technical Committee Gueiserne Rohre und Form- stcke. It should be noted that for sizes DN 3 to DN 6 and DN 8, DIN 2402 continues to apply. Amendments For sizes DN 10 and above, DIN 2402, February 1976 edition, has been superseded by the specifications of EN IS0 6708, which is
4、identical to IS0 6708. Previous editions DIN 2402: 1926-04, 1936-08, 1964-1 1, 1976-02. EN comprises 2 pages. Eeuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 08.96 DIN EN IS0 6708 Eng/. Price group 5 Sales No. 1105 EUROPEAN STANDARD NORME EUROPENNE EUROP
5、AISCHE NORM EN IS0 6708 July 1995 ICs 23.040.00 Descriptors: Pipework, nominal size. English version Pipework components Definition and selection of DN (nominal size) (IS0 6708 : 1995) Composants de rseau de tuyauteries; dfinition et slection des DN (diamtre nominal) (IS0 6708: 1995) Rohrleitungstei
6、le; Definition und Auswahl von DN (Nennweite) (IS0 6708: 1995) This European Standard was approved by CEN on 1995-06-12 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipu- late the conditions for giving this Europ
7、ean 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 CEN member. This European Standard exists in three official versions (English,
8、 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 members are the national standards bodies of Austria, Belgium, Denmark, Finla
9、nd, 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 Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-IO50 Bru
10、ssels 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 Page 2 EN IS0 6708: 1995 Foreword International Standard IS0 6708: 1995 Pipework components; definition and selection of DN (nominal
11、size), which was prepared by ISO/TC 5 Ferrous metal pipes and metallic fittings of the International Organization for Standardi- zation, has been adopted by Technical Committee CEN/TC 74 Flanges and their joints as a European Standard. This European Standard shall be given the status of a national s
12、tandard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by January 1996 at the latest. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark
13、, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard ISO6708:1995 was approved by CEN as a European Standard without any modification. 1 Scope T
14、his 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. NOTE 1 Other methods of size designation are also used, e.g. products having threaded, compression, solder or wel
15、ded end connections or products designated by NPS (nominal pipe size). OD (outside diameter). ID (inside diarn- 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
16、for components of a pipework system, which is used for reference purposes. It cornprises 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
17、the letters DN does 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 dirnen- sions should be given, e.g. DN/OD or DN/
18、ID. 3 DN Series The preferred 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 1400 DN 1 500 DN 1 600 DN 1 800 DN 2 O00 DN 2 200 DN 2 400 DN 2 600 DN 2 800 DN 3 O00 DN 3 200 DN 3 400 DN 3 600 DN 3 800 DN 4 O00
