DIN EN : (E)

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1 DIN EN : (E) Metallic industrial piping - Part 3: Design and calculation Contents Page Foreword Scope Normative references Terms, definitions, symbols and units Terms and definitions Symbols and units Basic design criteria General Loadings General Combination of loads Loads for dimensioning Other loads to be taken into account Design conditions Thickness Tolerances Joint coefficient Dimensioning of piping components subject to pressure Design stresses General Time-independent nominal design stress Steels other than austenitic steels Austenitic steels Nickel and / or chromium alloy steels Steels castings Additional requirements for steels with no specific control Time-dependent nominal design stress General Steels Nickel and/or chromium alloy steels Design of piping components under internal pressure Straight pipes Pipe bends and elbows General Symbols Required wall thicknesses Mitre bends General Symbols Effective radius of mitre bend Multiple mitre bends Single mitre bends Adjacent straight pipe sections of mitre bends Reducers Conditions of applicability Specific definitions

2 6.4.3 Specific symbols and abbreviations Conical shells Issue 2 ( ) Junctions - general Junction between the large end of a cone and a cylinder without a knuckle Junction between the large end of a cone and a cylinder with a knuckle Junction between the small end of a cone and a cylinder Offset reducers Special forged reducers Flexible piping components General Expansion joints Corrugated metal hose assemblies Bolted flange connections General Symbols Standard flange Non-standard flange Design of ends under internal pressure Dished ends Symbols Hemispherical ends Torispherical ends Ellipsoidal ends Calculation of Circular flat ends General Symbols Unstayed flat circular ends welded to cylindrical shells/pipes Unstayed flat circular bolted ends Reinforcements of openings in unstayed flat ends Openings and branch connections General Symbols Limitations Thickness ratio Openings in the vicinity of discontinuities Types of reinforcement Calculation method Elliptical openings and oblique branch connections Reinforcing pads Dissimilar material of shell and reinforcements Extruded outlets Branches in bends or elbows Screwed-in branches Isolated openings General Unreinforced openings Reinforced openings with di/di < 0, Reinforced single openings with 0,8 < d/d 1, Adjacent openings Unreinforced openings Reinforced openings with d/d 0, Design of special piping components Cylindrical Y-pieces Spherical Y-pieces Triform reinforced branches Design of piping components under external pressure General

3 9.2 Symbols and elastic stress limits Issue 2 ( ) Symbols Elastic stress limits Cylindrical pipes, elbows and mitre bends Determination of lengths Interstiffener collapse Overall collapse of stiffened pipes Stiffener stability Heating/cooling channels Reducers (conical shells) Dished ends Hemispherical ends Torispherical ends Ellipsoidal ends Design for cyclic loading General Exemption from detailed fatigue analysis Fatigue design for cyclic pressure Equivalent full load cycles Simplified fatigue analysis Fatigue design for thermal gradients General Design guidance Fatigue design for combined loads Integral attachments General Allowable stresses Symbols Hollow circular attachments Limitations Preliminary calculations Analysis of attachments welded to pipe with a full penetration weld Analysis of attachments welded to pipe with fillet or partial penetration weld Rectangular attachments Limitations Preliminary calculations Analysis of attachments welded to pipe with a full penetration weld Analysis of attachments welded to pipe with fillet or partial penetration weld Stress analysis of the run pipe Shear stress analysis in attachment Hollow circular attachments Rectangular attachments Alternative calculation methods Flexibility analysis and acceptance criteria Basic conditions General Loading conditions Allowable stresses Piping flexibility General Basic conditions Displacement strains Displacement stresses Stress range Cold pull Properties for flexibility analysis Supporting conditions Expansion joints

4 Issue 2 ( ) Flexibility analysis Flexibility analysis General Stress due to sustained loads Stress due to sustained and occasional or exceptional loads Stress range due to thermal expansion and alternating loads Additional conditions for the creep range Stresses due to a single non-repeated support movement Determination of resultant moments Reactions Fatigue analysis Vibration Supports General requirements General Classification of supports Additional definitions Boundaries Welded support attachments Material requirements Design General Design temperatures for support components Detail design Buckling Support location Determination of component sizes Connections Welded connections Bolted connections Design requirements for special components Constant load hangers and supports Variable load hangers and supports Rigid struts Shock arrestors (shock absorber, snubber) Sliding supports Anchors Documentation of supports Marking of supports Annex A (informative) Dynamic analysis A.1 General A.2 Analysis by calculation A.2.1 Seismic events A.2.2 Rapid valve closure A.2.3 Flow induced vibration A.2.4 Safety valve discharge A.2.5 Allowable stresses A.3 Alternative means of design verification A.3.1 Comparative studies A.3.2 Full scale testing A.3.3 Reduced scale testing Annex B (normative) More accurate calculation of bends and elbows B.1 General B.2 Symbols and units B.3 Required wall thickness B.4 Calculation

5 B.4.1 Calculation of wall thickness Issue 2 ( ) B.4.2 Stress calculation Annex C (informative) Expansion joints C.1 Incorporation of expansion joints into piping systems C.1.1 General C.1.2 Types of expansion joints C.1.3 Design of expansion joints C.1.4 Designing with expansion joints C.1.5 Analyses and calculation C.1.6 Cold pull C.2 Maximum spacing for unrestrained axially compensated straight runs C.2.1 General C.2.2 Calculation rules C.2.3 Maximum spacing for defined conditions C.3 Indication for the design of expansion joints C.3.1 General C.3.2 Design data, Symbols C.3.3 Design and calculation C.3.4 Information for the system analyst Annex D (normative) Flanges D.1 Purpose D.2 Specific terms and definitions D.3 Specific symbols and abbreviations D.4 General D.4.1 Introduction D.4.2 Use of standard flanges without calculation D.4.3 Bolting D.4.4 Flange construction D.4.5 Machining D.4.6 Gaskets D.5 Narrow face gasketed flanges D.5.1 General D.5.2 Bolt loads and areas D.5.3 Flange moments D.5.4 Flange stresses and stress limits D.5.5 Narrow face flanges subject to external pressure D.5.6 Lap joints D.5.7 Split ring flanges D.6 Full face flanges with soft ring type gaskets D.6.1 Specific symbols and abbreviations D.6.2 Bolt loads and areas D.6.3 Flange design D.6.4 Full face flanges subject to external pressure D.7 Seal welded flanges D.8 Reverse narrow face flanges D.8.1 Internal pressure D.8.2 External pressure D.9 Reverse full face flanges D.9.1 General D.9.2 Design following method of D D.9.3 Design following method of D D.10 Full face flanges with metal to metal contact D.10.1 General D.10.2 Specific symbols and abbreviations D.10.3 Design Annex E (normative) Design of branch connections in piping accessories

6 E.1 Scope E.1.1 General Issue 2 ( ) E.2 Reinforcement E.2.1 Angles and areas E.2.2 The following condition shall be satisfied: E.3 Flexibility analysis Annex F (informative) Testing during operation in the case of cyclic loading F.1 Testing during operation F.2 Measures to be taken when the calculated fatigue life has been reached Annex G (informative) Physical properties of steels G.1 General G.2 Physical properties G.2.1 Density G.2.2 Differential coefficient of linear expansion G.2.3 Specific thermal capacity G.2.4 Thermal diffusivity G.2.5 Poisson's ratio G.3 Physical properties of steels Annex H (normative) Flexibility characteristics, flexibility and stress intensification factors and section moduli of piping components and geometrical discontinuities Annex I (informative) Production testing of spring supports and shock arrestors (shock absorbers) I.1 Constant load supports I.2 Variable spring supports I.3 Shock arrestors Annex J (normative) Type testing of support components Annex K (informative) Attachment of supports to structures K.1 Attachment of supports to concrete structures K.2 Attachment to metallic structures K.2.1 Standard bolts K.2.2 Friction grip bolts K.2.3 Welding Annex L (informative) Buckling of linear type supports L.1 General L.2 Symbols L.3 Basic formulae L.4 Allowable compressive stress L.5 Buckling length Annex M (informative) Design guidance for structural components M.1 Linear type components subjected to bending M.1.1 General M.1.2 Supplementary verifications for linear type supports M.2 Stability of plate type supports M.3 Anchorage plates or equivalent anchorage components M.3.1 General M.3.2 Design of simple anchorage plates

7 M.3.3 Fixing plates with stiffening gussets M.3.4 Load calculations for anchorages fixed in concrete Annex N (normative) Documentation of supports Annex O (normative) Alternative method for checking branch connections O.1 Scope O.2 Symbols O.3 Design and checking of the branch connection O.3.1 Limit value for the load due to pressure only for straight pipes without opening O.3.2 Determination of the minimum thicknesses under loading due to pressure only Issue 2 ( ) O.3.3 Checking of the thicknesses selected for the combination of pressure loading and loadings due to external loads Annex P (informative) Bolted flange connections -- Application of EN P.1 Introduction P.2 Scope P.2.1 General P.2.2 Materials P.2.3 Loadings P.2.4 Assumptions P.3 Application of EN P.3.1 Calculations P.3.2 Gasket coefficients P.3.3 Tightening Annex Q (informative) Simplified pipe stress analysis Q.1 General Q.2 Simplified procedure Q.2.1 General Q.2.2 Specification of allowable spacing of supports Q.2.3 Check of elasticity Q.3 Explanatory notes for Table Q Q.4 Symbols Q.5 Indices fl Q.6 Explanatory notes to Q Q.6.1 Specification of allowable spacing of supports Q.7 Conversion of the allowable lengths Q.7.1 Other support conditions Q.7.2 Other parameters Q.8 Additional single loads Q.8.1 General Q.9 Explanatory note on Figure Q Q.9.1 General Q.9.2 Required pipe leg length L1, for f1 from the nomogram Q.9.3 Required pipe leg length L2, for f2 from the nomogram Annex ZA (informative) Relationship between this European Standard and the essential requirements of EU Directive 97/23/EC Bibliography

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