ÖNORM EN 13480-3 Edition: 2007-05-01

Metallic industrial piping Part 3: Design and calculation (consolidated version) Metallische industrielle Rohrleitungen ― Teil 3: Konstruktion und Berechnung (konsolidierte Fassung) Tuyauteries industrielles métalliques ― Partie 3: Conception et calcul (version consolidée)

ICS 23.040.01 Identical (IDT) with (see National Foreword) Supersedes ÖNORM EN 13480-3:2006-10 responsible ON-Committee ON-K 007 Pressure equipment

Publisher and printing ON Österreichisches Normungsinstitut Austrian Standards Institute Heinestraße 38, 1020 Wien Copyright © ON – 2007. All rights reserved! No part of this publication may be reproduced or utilized in any form or by any means – electronic, mechanical, photpcopying or any other data carries without prior permission from ON! E-Mail: copyright@on-norm.at Sale and distribution of national and foreign standards and technical regulations via ON Österreichisches Normungsinstitut Austrian Standards Institute Heinestraße 38, 1020 Wien E-Mail: sales@on-norm.at Internet: www.on-norm.at/shop Fax: (+43 1) 213 00-818 Tel.: (+43 1) 213 00-805

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ÖNORM 13480-3

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National Foreword

The present ÖNORM EN 13480-3 has been published without formal voting procedure. It represents the consolidated national English version of EN 13480-3:2002-05 which includes the following CEN-Correction Notices EN 13480:2002:

CEN-Correction Notices EN 13480:2002,

version 02 (2005-08), Amendment EN 13480-3/A1:2005-08 as version 04 (2005-11), version 06 (2006-03), version 07 (2006-08), Amendment EN 13480-3/A2:2006-11 as version 08 (2006-11) and version 09 (2006-12).

Pages with version number 1 correspond to EN 13480-3:2002-05. Corrections which were made in the text are marked by a stroke as well as the new version number is located under the Standard number on the head of the page.

With version number 08 (2006-11) the Amendment EN 13480-3:2002/A2:2006-11 was implemented into the present ÖNORM and the following pages have been changed:

page 5, 6, 7, 40, 41, 149, 194, 196, 265cc to 265el, 268 and 269.

Furthermore with version 09 (2006-12) the following pages of the present ÖNORM have been changed:

page 5, 32, 41, 44, 45, 71, 80, 96 to 98, 142, 146, 149, 153, 243, 245 to 248, 265ac, 265ad, 265ae, 265ar, 265av, 265be, 265bl, 265br, 265bx, 265bz.

An overview of the corrected pages with their version numbers is sited on the website for the so called “EN 13480 Migration Help Desk” under

http://comelec.afnor.fr/cen(/en13480 Scope Published Standards.

The European Standard EN 13480-3:2002-05 was already published in the Official Journal of the European Communities (2001/C 171/08) and has now the status of a Harmonized Standard related to the Directive 97/23/EC concerning pressure equipment. Annex ZA of this Standard presents the relationship between the different clauses of the Standard and the basic requirements given in Annex I of the Directive 97/23/EC.

Through the Decree on Pressure Equipment (DGVO, BGBl. II Nr. 426/1999) the Directive 97/23/EC has been converted into Austrian domestic law. §9 paragraph 1 Z 1 of DGVO makes reference to harmonized standards.

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EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 13480-3

May 2002

ICS 23.040.01

English version

Metallic industrial piping - Part 3: Design and calculation

Tuyauteries industrielles métalliques - Partie 3: Conceptionet calcul

Metallische industrielle Rohrleitungen - Teil 3: Konstruktionund Berechnung

This European Standard was approved by CEN on 23 May 2002.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATIONC OM ITÉ EUR OP ÉEN DE NOR M ALIS AT IONEUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2002 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. EN 13480-3:2002 E

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Contents

Foreword....................................................................................................................... ...............................................6

1 Scope ......................................................................................................................... .....................................7

2 Normative references .......................................................................................................... ..........................7

3 Terms, definitions, symbols and units ......................................................................................... ...............83.1 Terms and definitions....................................................................................................... .............................83.2 Symbols and units ........................................................................................................... ..............................8

4 Basic design criteria......................................................................................................... ...........................104.1 General..................................................................................................................... .....................................104.2 Loadings .................................................................................................................... ...................................104.2.1 General................................................................................................................... .......................................104.2.2 Combination of loads ...................................................................................................... ............................114.2.3 Loads for dimensioning .................................................................................................... ..........................114.2.4 Other loads to be taken into account ...................................................................................... ..................124.2.5 Design conditions......................................................................................................... ...............................134.3 Thickness................................................................................................................... ...................................164.4 Tolerances .................................................................................................................. ..................................184.5 Joint coefficient........................................................................................................... .................................184.6 Dimensioning of piping components subject to pressure ......................................................................1 8

5 Design stresses............................................................................................................... .............................195.1 General..................................................................................................................... .....................................195.2 Time-independent nominal design stress...................................................................................... ...........195.2.1 Steels other than austenitic steels....................................................................................... ......................195.2.2 Austenitic steels......................................................................................................... ..................................205.2.3 Nickel and / or chromium alloy steels ..................................................................................... ..................205.2.4 Steels castings........................................................................................................... ..................................205.2.5 Additional requirements for steels with no specific control ............................................................... ....215.3 Time-dependent nominal design stress ........................................................................................ ............215.3.1 General................................................................................................................... .......................................215.3.2 Steels.................................................................................................................... .........................................215.3.3 Nickel and/or chromium alloy steels ....................................................................................... ..................22

6 Design of piping components under internal pressure........................................................................... 226.1 Straight pipes .............................................................................................................. .................................226.2 Pipe bends and elbows ....................................................................................................... ........................236.2.1 General................................................................................................................... .......................................236.2.2 Symbols ................................................................................................................... .....................................236.2.3 Required wall thicknesses ................................................................................................. .........................236.3 Mitre bends................................................................................................................. ..................................256.3.1 General................................................................................................................... .......................................256.3.2 Symbols ................................................................................................................... .....................................256.3.3 Effective radius of mitre bend ............................................................................................ ........................266.3.4 Multiple mitre bends ...................................................................................................... ..............................276.3.5 Single mitre bends........................................................................................................ ...............................276.3.6 Adjacent straight pipe sections of mitre bends............................................................................ ............276.4 Reducers.................................................................................................................... ...................................276.4.1 Conditions of applicability ............................................................................................... ...........................276.4.2 Specific definitions ...................................................................................................... ................................286.4.3 Specific symbols and abbreviations........................................................................................ ..................296.4.4 Conical shells ............................................................................................................ ...................................306.4.5 Junctions - general ....................................................................................................... ...............................306.4.6 Junction between the large end of a cone and a cylinder without a knuckle .......................................316.4.7 Junction between the large end of a cone and a cylinder with a knuckle .............................................34

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6.4.8 Junction between the small end of a cone and a cylinder ................................................................... ...356.4.9 Offset reducers ........................................................................................................... .................................376.4.10 Special forged reducers.................................................................................................. ............................376.5 Flexible piping components .................................................................................................. .....................386.5.1 General................................................................................................................... .......................................386.5.2 Expansion joints .......................................................................................................... ................................386.5.3 Corrugated metal hose assemblies .......................................................................................... .................396.6 Bolted flange connections................................................................................................... .......................40

7 Design of ends under internal pressure........................................................................................ ............417.1 Dished ends................................................................................................................. .................................417.1.1 Symbols ................................................................................................................... .....................................417.1.2 Hemispherical ends ........................................................................................................ .............................417.1.3 Torispherical ends ........................................................................................................ ...............................427.1.4 Ellipsoidal ends.......................................................................................................... ..................................447.1.5 Calculation of � ............................................................................................................................................457.2 Circular flat ends.......................................................................................................... ................................487.2.1 General................................................................................................................... .......................................487.2.2 Symbols ................................................................................................................... .....................................487.2.3 Unstayed flat circular ends welded to cylindrical shells/pipes ............................................................ ..507.2.4 Unstayed flat circular bolted ends ........................................................................................ .....................577.2.5 Reinforcements of openings in unstayed flat ends .......................................................................... .......63

8 Openings and branch connections............................................................................................... .............668.1 General..................................................................................................................... .....................................668.2 Symbols ..................................................................................................................... ...................................668.3 Limitations................................................................................................................. ...................................678.3.1 Thickness ratio........................................................................................................... ..................................678.3.2 Openings in the vicinity of discontinuities ............................................................................... ................688.3.3 Types of reinforcement .................................................................................................... ...........................708.3.4 Calculation method........................................................................................................ ..............................718.3.5 Elliptical openings and oblique branch connections ........................................................................ ......718.3.6 Reinforcing pads.......................................................................................................... ................................728.3.7 Dissimilar material of shell and reinforcements........................................................................... ............738.3.8 Extruded outlets.......................................................................................................... .................................738.3.9 Branches in bends or elbows............................................................................................... ......................738.3.10 Screwed-in branches...................................................................................................... .............................738.4 Isolated openings ........................................................................................................... .............................748.4.1 General................................................................................................................... .......................................748.4.2 Unreinforced openings..................................................................................................... ...........................778.4.3 Reinforced openings with di/Di < 0,8........................................................................................................778.4.4 Reinforced single openings with 0,8 < d/D � 1,0 ......................................................................................838.5 Adjacent openings........................................................................................................... ............................838.5.1 Unreinforced openings..................................................................................................... ...........................838.5.2 Reinforced openings with d/D � 0,8 ...........................................................................................................838.6 Design of special piping components ......................................................................................... ..............848.6.1 Cylindrical Y-pieces...................................................................................................... ...............................848.6.2 Spherical Y-pieces ........................................................................................................ ...............................858.6.3 Triform reinforced branches............................................................................................... ........................86

9 Design of piping components under external pressure ..........................................................................8 79.1 General..................................................................................................................... .....................................879.2 Symbols and elastic stress limits ........................................................................................... ...................899.2.1 Symbols ................................................................................................................... .....................................899.2.2 Elastic stress limits ..................................................................................................... ................................909.3 Cylindrical pipes, elbows and mitre bends................................................................................... ............909.3.1 Determination of lengths .................................................................................................. ..........................909.3.2 Interstiffener collapse................................................................................................... ...............................929.3.3 Overall collapse of stiffened pipes ....................................................................................... .....................949.3.4 Stiffener stability....................................................................................................... ...................................959.3.5 Heating/cooling channels .................................................................................................. .........................989.4 Reducers (conical shells) ................................................................................................... ........................999.5 Dished ends................................................................................................................. ...............................101

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9.5.1 Hemispherical ends ........................................................................................................ ...........................1019.5.2 Torispherical ends ........................................................................................................ .............................1029.5.3 Ellipsoidal ends.......................................................................................................... ................................102

10 Design for cyclic loading .................................................................................................... ......................10210.1 General.................................................................................................................... ....................................10210.2 Exemption from detailed fatigue analysis................................................................................... ............10210.3 Fatigue design for cyclic pressure......................................................................................... ..................10310.3.1 Equivalent full load cycles .............................................................................................. ..........................10310.3.2 Simplified fatigue analysis.............................................................................................. ..........................10310.4 Fatigue design for thermal gradients ....................................................................................... ...............11710.4.1 General.................................................................................................................. ......................................11710.4.2 Design guidance .......................................................................................................... ..............................11710.5 Fatigue design for combined loads .......................................................................................... ...............117

11 Integral attachments......................................................................................................... .........................11811.1 General.................................................................................................................... ....................................11811.2 Allowable stresses......................................................................................................... ............................11811.3 Analysis methods for welded attachments on piping.......................................................................... ..11911.3.1 General.................................................................................................................. ......................................11911.3.2 Symbols .................................................................................................................. ....................................11911.3.3 Limitations .............................................................................................................. ....................................12011.3.4 Preliminary calculations................................................................................................. ...........................12111.3.5 Analysis of attachments welded to pipe with a full penetration weld ..................................................12411.3.6 Analysis of attachments welded to pipe with fillet or partial penetration weld ..................................12511.3.7 Stress analysis of the run pipe.......................................................................................... .......................12511.4 Alternative calculation methods............................................................................................ ...................126

12 Flexibility analysis and acceptance criteria ................................................................................. ...........12612.1 Basic conditions ........................................................................................................... .............................12612.1.1 General.................................................................................................................. ......................................12612.1.2 Loading conditions....................................................................................................... .............................12712.1.3 Allowable stresses....................................................................................................... ..............................12712.2 Piping flexibility......................................................................................................... .................................12812.2.1 General.................................................................................................................. ......................................12812.2.2 Basic conditions ......................................................................................................... ...............................12912.2.3 Displacement strains..................................................................................................... ............................12912.2.4 Displacement stresses .................................................................................................... ..........................13012.2.5 Stress range ............................................................................................................. ..................................13112.2.6 Cold spring .............................................................................................................. ...................................13112.2.7 Properties for flexibility analysis...................................................................................... ........................13112.2.8 Supporting conditions.................................................................................................... ...........................13212.2.9 Expansion joints ......................................................................................................... ...............................13312.2.10 Flexibility analysis .................................................................................................... .................................13312.3 Flexibility analysis ....................................................................................................... ..............................13512.3.1 General.................................................................................................................. ......................................13512.3.2 Stress due to sustained loads ............................................................................................ ......................13612.3.3 Stress due to sustained and occasional or exceptional loads .............................................................1 3612.3.4 Stress range due to thermal expansion and alternating loads .............................................................1 3712.3.5 Additional conditions for the creep range ................................................................................ ..............13812.3.6 Stresses due to a single non-repeated support movement ..................................................................1 3812.3.7 Determination of resultant moments ....................................................................................... ................13812.3.8 Reactions ................................................................................................................ ....................................14112.4 Fatigue analysis ........................................................................................................... ..............................141

13 Supports ..................................................................................................................... ................................14113.1 General requirements....................................................................................................... .........................14113.1.1 General.................................................................................................................. ......................................14113.1.2 Classification of supports............................................................................................... ..........................14113.1.3 Additional definitions ................................................................................................... .............................142Boundaries ..................................................................................................................... .........................................14213.1.5 Welded support attachments............................................................................................... .....................14413.2 Material requirements...................................................................................................... ..........................14613.3 Design ..................................................................................................................... ....................................146

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13.3.1 General........................................................................................................................................................146

13.3.2 Design temperatures for support components ......................................................................................147

13.3.3 Detail design ..............................................................................................................................................148

13.3.4 Buckling......................................................................................................................................................149

13.3.5 Vibration .....................................................................................................................................................149

13.3.6 Support location ........................................................................................................................................150

13.3.7 Determination of component sizes..........................................................................................................150

13.4 Connections ...............................................................................................................................................151

13.4.1 Welded connections..................................................................................................................................151

13.4.2 Bolted connections ...................................................................................................................................152

13.5 Design requirements for special components .......................................................................................152

13.5.1 Constant load hangers and supports......................................................................................................152

13.5.2 Variable load hangers and supports .......................................................................................................153

13.5.3 Rigid struts.................................................................................................................................................155

13.5.4 Shock arrestors .........................................................................................................................................155

13.5.5 Sliding supports ........................................................................................................................................156

13.5.6 Anchors ......................................................................................................................................................156

13.6 Documentation of supports......................................................................................................................157

13.7 Marking of supports ..................................................................................................................................157

Annex A (informative) Dynamic analysis.............................................................................................................158

Annex B (normative) More accurate calculation of bends and elbows..........................................................171

Annex C (informative) Expansion joints ..............................................................................................................179

Annex D (normative) Flanges .............................................................................................................................194

Annex E (normative) Design of branch connections in piping accessories .................................................229

Annex F (informative) Testing during operation in the case of cyclic loading...............................................234

Annex G (informative) Physical properties of steels..........................................................................................235

Annex H (normative) Flexibility characteristics, flexibility and stress intensification factors and section moduli of piping components and geometrical discontinuities .............................................242

Annex I (informative) Production testing of spring supports and shock arrestors ......................................250

Annex J (normative) Type testing of support components.............................................................................255

Annex K (informative) Attachment of supports to structures ...........................................................................256

Annex L (informative) Buckling of linear type supports ...................................................................................258

Annex M (informative) Design guidance for structural components................................................................261

Annex N (normative) Documentation of supports..............................................................................................265

Annex O (normative) Alternative method for checking branch connections ..............................................265aa

Annex P (informative) Bolted flange connections - Application of EN 1591................................................265cc

Annex ZA (informative) Relationship between this European Standard and the essential requirements of EU Directive 97/23/EC ...........................................................................................................................266

Bibliography............................................................................................................................................................268 AS

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Foreword

This document (EN 13480-3:2002, EN 13480-3:2002/A1:2005 and EN 13480-3:2002/A2:2006) has been prepared by Technical Committee CEN /TC 267, "Industrial piping and pipelines", the secretariat of which is held by AFNOR.

EN 13480-3:2002 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002. EN 13480-3:2002/A1:2005 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006. EN 13480-3:2002/A2:2006 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2007, and conflicting national standards shall be withdrawn at the latest by May 2007.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this European Standard.

In this European Standard the Annexes A, C, F, G, I, K, L, M and P are informative and the Annexes B, D, E, H, J, N and O are normative.

This European Standard EN 13480 for metallic industrial piping is the third part of a set of seven interdependent Parts which are:

Part 1: General.

Part 2: Materials.

Part 3: Design and calculation.

Part 4: Fabrication and installation.

Part 5: Inspection and testing;

Part 6: Additional requirements for buried piping.

CEN/TR 13480-7: Guidance on the use of conformity assessment procedures.

According to the CEN/CENELEC Internal 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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