DIN EN : (E)

Transcription

1 DIN EN : (E) Unfired pressure vessels - Part 3: Design Contents Page Foreword Scope Normative references Terms and definitions Symbols and abbreviations Basic design criteria General Corrosion, erosion and protection Load cases Design methods Thickness calculations (DBF) Joint coefficient Design requirements of welded joints Maximum allowed values of the nominal design stress for pressure parts General Steels (except castings), other than austenitic steels covered by 6.4 and 6.5, with a minimum rupture elongation, as given in the relevant technical specification for the material, below 30 % Alternative route for steels (except castings), other than austenitic steels covered by 6.4 and 6.5, with a minimum rupture elongation, as given in the relevant technical specification for the material, below 30 % Austenitic steels (except castings) with a minimum elongation after rupture, as given in the relevant technical specification for the material, from 30 % to 35 % Austenitic steels (except castings) with a minimum rupture elongation, as given in the relevant technical specification for the material, from 35 % Cast steels Shells under internal pressure Purpose Specific definitions Specific symbols and abbreviations Cylindrical and spherical shells Dished ends Cones and conical ends Nozzles which encroach into the knuckle region Shells under external pressure Purpose Specific definitions Specific symbols and definitions General Cylindrical shells Conical shell Spherical shells Vessel ends

2 9 Openings in shells Purpose Specific definitions Specific symbols and abbreviations General Isolated openings Multiple openings Openings close to a shell discontinuity Flat ends Purpose Specific definitions Specific symbols and abbreviations Unpierced circular flat ends welded to cylindrical shells Unpierced bolted circular flat ends Pierced circular flat ends Flat ends of non-circular or annular shape Flanges Purpose Specific definitions Specific symbols and abbreviations General Narrow face gasketed flanges Full face flanges with soft ring type gaskets Seal welded flanges Reverse narrow face flanges Reverse full face flanges Full face flanges with metal to metal contact Bolted domed ends Purpose Specific definitions Specific symbols and abbreviations General Bolted domed ends with narrow face gaskets Bolted domed ends with full face joints Heat Exchanger Tubesheets Purpose Specific definitions Specific symbols and abbreviations U-tube tubesheet heat exchangers Fixed tubesheet heat exchangers Floating tubesheet heat exchangers Tubesheet characteristics Maximum permissible tube to tubesheet joint stress Maximum permissible longitudinal compressive stress for tubes Design of tubesheet flange extension with a narrow face gasket Design of tubesheet flange extension with a full face gasket Special tube-to-tubesheet welded joints Expansion bellows Purpose Specific definitions Specific symbols and abbreviations Conditions of applicability U-shaped unreinforced bellows U-shaped reinforced bellows Toroidal bellows Fabrication

3 14.9 Inspection and testing Bellows subjected to axial, lateral or angular displacements Pressure vessels of rectangular section Purpose Specific definitions Specific symbols and abbreviations General Unreinforced vessels Reinforced vessels Openings Additional non-pressure loads Purpose Specific definitions Specific symbols and abbreviations Local loads on nozzles in spherical shells Local loads on nozzles in cylindrical shells Line loads Lifting lugs Horizontal vessels on saddle supports Horizontal vessels on ring supports Vertical vessels on bracket supports Vertical vessels with supporting legs Vertical vessels with skirts Vertical vessels with ring supports Global loads Simplified assessment of fatigue life Purpose Specific definitions Specific symbols and abbreviations Conditions of applicability General Determination of allowable number of pressure cycles Assessment rule Design and manufacture Testing Detailed assessment of fatigue life Purpose Specific definitions Specific symbols and abbreviations Limitations General Welded material Unwelded components and bolts Elastic-plastic conditions Fatigue action Fatigue strength of welded components Fatigue strength of unwelded components Fatigue strength of steel bolts Creep design Purpose Specific definitions Specific symbols and abbreviations Design in the creep range Nominal Design stress in the creep range Weld joint factor in the creep range Pressure loading of predominantly non-cyclic nature in the creep range

4 19.8 Design procedures for DBF Design rules for reinforced flat walls General Stayed flat walls Specific definitions for stayed flat walls Required thickness of stayed flat walls Required dimensions and layout of staybolts and stays Requirements for threaded staybolts Requirements for welded-in staybolts and welded stays Tables for stayed flat walls Figures for Stayed Flat Walls Circular flat ends with radial reinforcement ribs Purpose Specific definitions Specific symbols and abbreviations Ends without additional peripheral bending moment Ends with additional peripheral bending moment Openings Welds Central Ring Annex A (normative) Design requirements for pressure bearing welds Annex B (normative) Design by Analysis - Direct Route Annex C (normative) Design by analysis - Method based on stress categories Annex D (informative) Verification of the shape of vessels subject to external pressure Annex E (normative) Procedure for calculating the departure from the true circle of cylinders and cones Annex F (normative) Allowable external pressure for vessels outside circularity tolerance Annex G (normative) Alternative design rules for flanges and gasketed flange connections Annex GA (informative) Alternative design rules for flanges and gasketed flange connections Annex H (informative) Gasket factors m and y Annex I (informative) Additional information on heat exchanger tubesheet design Annex J (normative) Alternative method for the design of heat exchanger tubesheets Annex K (informative) Additional information on expansion bellows design Annex L (informative) Basis for design rules related to additional non-pressure loads Annex M (informative) In service monitoring of vessels operating in fatigue or creep Annex N (informative) Bibliography to clause Annex O (informative) Physical properties of steels Annex P (normative) Classification of weld details to be assessed using principal stresses Annex Q (normative) Simplified procedure for the fatigue assessment of unwelded zones

5 Annex R (informative) Coefficients for creep-rupture model equations for extrapolation of creeprupture strength Annex S (informative) Extrapolation of the nominal design stress based on time- independent behaviour in the creep range Annex T (normative) Design by experimental methods Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of the EU Pressure Equipment Directive 97/23/EC