SIST EN 13480-3:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Metallische industrielle Rohrleitungen - Teil 3: Konstruktion und BerechnungTuyauteries industrielles métalliques - Partie 3: Conception et calculMetallic industrial piping - Part 3: Design and calculation77.140.75Jeklene cevi in cevni profili za posebne nameneSteel pipes and tubes for specific useICS:Ta slovenski standard je istoveten z:EN 13480-3:2012SIST EN 13480-3:2012en,fr,de01-oktober-2012SIST EN 13480-3:2012SLOVENSKI
STANDARDSIST EN 13480-3:2002/A3:2009SIST EN 13480-3:2002/A4:2010SIST EN 13480-3:2002/A5:2012SIST EN 13480-3:2002SIST EN 13480-3:2002/A1:2005SIST EN 13480-3:2002/A2:20071DGRPHãþD



SIST EN 13480-3:2012



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13480-3
June 2012 ICS 23.040.01 Supersedes EN 13480-3:2002English Version
Metallic industrial piping - Part 3: Design and calculation
Tuyauteries industrielles métalliques - Partie 3: Conception et calcul
Metallische industrielle Rohrleitungen - Teil 3: Konstruktion und Berechnung This European Standard was approved by CEN on 8 May 2012.
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 CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Turkey and United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
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B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13480-3:2012: ESIST EN 13480-3:2012



EN 13480-3:2012 (E)
Issue 1 (2012-06) 2 Contents Page Foreword .9 1 Scope .11 2 Normative references .11 3 Terms, definitions, symbols and units .12 3.1 Terms and definitions .12 3.2 Symbols and units .12 4 Basic design criteria .14 4.1 General .14 4.2 Loadings .14 4.2.1 General .14 4.2.2 Combination of loads .15 4.2.3 Loads for dimensioning .15 4.2.4 Other loads to be taken into account .16 4.2.5 Design conditions .18 4.3 Thickness .20 4.4 Tolerances .22 4.5 Joint coefficient .22 4.6 Dimensioning of piping components subject to pressure .22 5 Design stresses .23 5.1 General .23 5.2 Time-independent nominal design stress .23 5.2.1 Steels other than austenitic steels .23 5.2.2 Austenitic steels .23 5.2.3 Nickel and / or chromium alloy steels .24 5.2.4 Steels castings .24 5.2.5 Additional requirements for steels with no specific control .24 5.3 Time-dependent nominal design stress .25 5.3.1 General .25 5.3.2 Steels .25 5.3.3 Nickel and/or chromium alloy steels .26 6 Design of piping components under internal pressure .26 6.1 Straight pipes .26 6.2 Pipe bends and elbows .27 6.2.1 General .27 6.2.2 Symbols .27 6.2.3 Required wall thicknesses .27 6.3 Mitre bends .29 6.3.1 General .29 6.3.2 Symbols .29 6.3.3 Effective radius of mitre bend .30 6.3.4 Multiple mitre bends .31 6.3.5 Single mitre bends .31 6.3.6 Adjacent straight pipe sections of mitre bends .31 6.4 Reducers .31 6.4.1 Conditions of applicability .31 6.4.2 Specific definitions .32 6.4.3 Specific symbols and abbreviations.32 6.4.4 Conical shells .33 SIST EN 13480-3:2012



EN 13480-3:2012 (E)
Issue 1 (2012-06) 3 6.4.5 Junctions - general . 34 6.4.6 Junction between the large end of a cone and a cylinder without a knuckle . 34 6.4.7 Junction between the large end of a cone and a cylinder with a knuckle . 37 6.4.8 Junction between the small end of a cone and a cylinder . 38 6.4.9 Offset reducers . 40 6.4.10 Special forged reducers. 40 6.5 Flexible piping components . 41 6.5.1 General . 41 6.5.2 Expansion joints . 41 6.5.3 Corrugated metal hose assemblies . 42 6.6 Bolted flange connections. 44 6.6.1 General . 44 6.6.2 Symbols . 44 6.6.3 Standard flange . 44 6.6.4 Non-standard flange . 45 7 Design of ends under internal pressure . 45 7.1 Dished ends . 45 7.1.1 Symbols . 45 7.1.2 Hemispherical ends . 46 7.1.3 Torispherical ends . 46 7.1.4 Ellipsoidal ends . 48 7.1.5 Calculation of  . 49 7.2 Circular flat ends . 52 7.2.1 General . 52 7.2.2 Symbols . 52 7.2.3 Unstayed flat circular ends welded to cylindrical shells/pipes . 54 7.2.4 Unstayed flat circular bolted ends . 61 7.2.5 Reinforcements of openings in unstayed flat ends . 67 8 Openings and branch connections . 69 8.1 General . 69 8.2 Symbols . 70 8.3 Limitations . 71 8.3.1 Thickness ratio . 71 8.3.2 Openings in the vicinity of discontinuities . 72 8.3.3 Types of reinforcement . 74 8.3.4 Calculation method . 75 8.3.5 Elliptical openings and oblique branch connections . 75 8.3.6 Reinforcing pads . 77 8.3.7 Dissimilar material of shell and reinforcements . 77 8.3.8 Extruded outlets . 77 8.3.9 Branches in bends or elbows . 77 8.3.10 Screwed-in branches . 77 8.4 Isolated openings . 78 8.4.1 General . 78 8.4.2 Unreinforced openings . 81 8.4.3 Reinforced openings with di/Di
< 0,8 . 81 8.4.4 Reinforced single openings with 0,8 < d/D  1,0 . 87 8.5 Adjacent openings . 87 8.5.1 Unreinforced openings . 87 8.5.2 Reinforced openings with d/D  0,8 . 87 8.6 Design of special piping components . 88 8.6.1 Cylindrical Y-pieces . 88 8.6.2 Spherical Y-pieces . 89 8.6.3 Triform reinforced branches . 90 9 Design of piping components under external pressure . 91 9.1 General . 91 9.2 Symbols and elastic stress limits . 93 SIST EN 13480-3:2012



EN 13480-3:2012 (E)
Issue 1 (2012-06) 4 9.2.1 Symbols .93 9.2.2 Elastic stress limits .94 9.3 Cylindrical pipes, elbows and mitre bends .94 9.3.1 Determination of lengths .94 9.3.2 Interstiffener collapse .96 9.3.3 Overall collapse of stiffened pipes .98 9.3.4 Stiffener stability .99 9.3.5 Heating/cooling channels . 102 9.4 Reducers (conical shells) . 103 9.5 Dished ends . 104 9.5.1 Hemispherical ends . 104 9.5.2 Torispherical ends . 105 9.5.3 Ellipsoidal ends . 105 10 Design for cyclic loading . 106 10.1 General . 106 10.2 Exemption from detailed fatigue analysis . 106 10.3 Fatigue design for cyclic pressure . 107 10.3.1 Equivalent full load cycles . 107 10.3.2 Simplified fatigue analysis . 107 10.4 Fatigue design for thermal gradients . 121 10.4.1 General . 121 10.4.2 Design guidance . 121 10.5 Fatigue design for combined loads . 121 11 Integral attachments . 122 11.1 General . 122 11.2 Allowable stresses. 122 11.3 Symbols . 123 11.4 Hollow circular attachments . 125 11.4.1 Limitations . 125 11.4.2 Preliminary calculations . 125 11.4.3 Analysis of attachments welded to pipe with a full penetration weld . 127 11.4.4 Analysis of attachments welded to pipe with fillet or partial penetration weld . 128 11.5 Rectangular attachments . 128 11.5.1 Limitations . 128 11.5.2 Preliminary calculations . 128 11.5.3 Analysis of attachments welded to pipe with a full penetration weld . 130 11.5.4 Analysis of attachments welded to pipe with fillet or partial penetration weld . 130 11.6 Stress analysis of the run pipe . 131 11.7 Shear stress analysis in attachment. 132 11.7.1 Hollow circular attachments . 132 11.7.2 Rectangular attachments . 133 11.8 Alternative calculation methods . 133 12 Flexibility analysis and acceptance criteria . 133 12.1 Basic conditions . 133 12.1.1 General . 133 12.1.2 Loading conditions . 133 12.1.3 Allowable stresses. 133 12.2 Piping flexibility . 135 12.2.1 General . 135 12.2.2 Basic conditions . 135 12.2.3 Displacement strains . 136 12.2.4 Displacement stresses . 137 12.2.5 Stress range . 137 12.2.6 Cold pull . 138 12.2.7 Properties for flexibility analysis . 138 12.2.8 Supporting conditions . 139 12.2.9 Expansion joints . 140 SIST EN 13480-3:2012



EN 13480-3:2012 (E)
Issue 1 (2012-06) 5 12.2.10 Flexibility analysis . 140 12.3 Flexibility analysis . 142 12.3.1 General . 142 12.3.2 Stress due to sustained loads . 142 12.3.3 Stress due to sustained and occasional or exceptional loads . 143 12.3.4 Stress range due to thermal expansion and alternating loads . 144 12.3.5 Additional conditions for the creep range . 145 12.3.6 Stresses due to a single non-repeated support movement . 145 12.3.7 Determination of resultant moments . 145 12.3.8 Reactions . 148 12.4 Fatigue analysis . 148 12.5 Vibration . 148 13 Supports . 148 13.1 General requirements . 148 13.1.1 General . 148 13.1.2 Classification of supports . 149 13.1.3 Additional definitions . 149 13.1.4 Boundaries . 150 13.1.5 Welded support attachments . 152 13.2 Material requirements .
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