BS en ISO 6708_96 - Pipework Components — Definition and Selection of DN (Nominal Size)

August 6, 2017 | Author: Anonymous Rig3UZBqDD | Category: Engineering, Reference, Technology, Science, Business
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Pipework components — Definition and selection of DN (nominal size)

The European Standard EN ISO 6708:1995 has the status of a British Standard

ICS 23.040.00

BS EN ISO 6708:1996

BS EN ISO 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 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 Actuator 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 and 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 © 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

Amendments issued since publication Amd. No.



BS EN ISO 6708:1996

Contents Committees responsible National foreword Foreword 1 Scope 2 Definition 3 DN Series

© BSI 07-1999

Page Inside front cover ii 2 3 3 3


BS EN ISO 6708:1996

National foreword This British Standard has been prepared by Technical Committee PSE/15 and is the English language version of EN ISO 6708:1995 — Pipework components — Definition and selection of DN (nominal size), published by the European Committee for Standardization (CEN). It is identical with ISO 6708:1995, published by the International Organization for Standardization (ISO). A British Standard does not purport to include all the necessary provisions of a contract. 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, the EN title page, pages 2 and 3 and 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. ii

© BSI 07-1999


EN ISO 6708



Descriptors: Piping, components, diameters, size designation, numerical designations, definitions, selection

English version

Pipework components — Definition and selection of DN (nominal size) (ISO 6708:1995)

Composants de réseau de tuyauteries — Définition et sélection des DN (diamètre nominal) (ISO 6708:1995)

Rohrleitungsteile — Definition und Auswahl von DN (Nennweite) (ISO 6708:1995)

This European Standard was approved by CEN on 1995-06-12. 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-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 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, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 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 ISO 6708:1995 E

EN ISO 6708:1995

Foreword The text of the international standard ISO 6708:1995 has been prepared by Technical Committee ISO/TC 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, 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/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 United Kingdom.


© BSI 07-1999

EN ISO 6708:1995

1 Scope

3 DN Series

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.

The preferred DN values are as follows: DN 10

DN 250

DN 1 500

DN 15

DN 300

DN 1 600

DN 20

DN 350

DN 1 800

DN 25

DN 400

DN 2 000

DN 32

DN 450

DN 2 200

This International Standard gives a list of preferred DN values.

DN 40

DN 500

DN 2 400

DN 50

DN 600

DN 2 600

2 Definition

DN 60

DN 700

DN 2 800

2.1 DN

DN 65

DN 800

DN 3 000

DN 80

DN 900

DN 3 200

an alphanumeric designation of 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

DN 100

DN 1 000

DN 3 400

DN 125

DN 1 100

DN 3 600

DN 150

DN 1 200

DN 3 800

DN 200

DN 1 400

DN 4 000

NOTE1 Other methods of size designation are also used, e.g. products having threaded, compression, solder 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.

NOTE 2 The number following the letters DN does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard. NOTE 3 In 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.

© BSI 07-1999


BS EN ISO 6708:1996

BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the internationalstandardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.

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