BS EN 12516-2:2014
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Industrial valves. Shell design strength – Calculation method for steel valve shells
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 104 |
This European Standard specifies the method for the strength calculation of the shell with respect to internal pressure of the valve.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Contents Page |
| 6 | Foreword |
| 8 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Symbols and units Table 1 — Symbols characteristics and units |
| 14 | 4 General conditions for strength calculation |
| 15 | Figure 1 — Composition of section thickness and tolerance allowances 5 Design pressure 6 Nominal design stresses for pressure parts other than bolts 6.1 General |
| 16 | Table 2 — Nominal design stresses (allowable stresses) 6.2 Steels and cast steels other than defined in 6.3, 6.4 or 6.5 6.3 Austenitic steel and austenitic cast steel with a minimum rupture elongation not less than 30 % |
| 17 | 6.4 Austenitic steel and austenitic cast steel with a minimum rupture elongation not less than 35 % 6.5 Ferritic and martensitic cast steel 6.6 Creep conditions 7 Calculation methods for the wall thickness of valve bodies 7.1 General |
| 18 | 7.2 Wall thickness of bodies and branches outside crotch area 7.2.1 General 7.2.2 Cylindrical bodies or branches |
| 19 | 7.2.3 Spherical bodies or branches 7.2.4 Conical bodies or branches |
| 20 | Figure 2 — Cone calculation coefficient |
| 21 | Table 3 — Cone calculation coefficient 7.2.5 Bodies or branches with oval or rectangular cross-sections 7.2.5.1 General |
| 22 | 7.2.5.2 Oval-shaped cross sections Figure 4 — Calculation coefficient B03 for location 3 |
| 23 | Figure 5 — Calculation coefficient Bn for oval-shaped cross-sections |
| 24 | Figure 6 — Examples of changes in cross-section B – B in oval basic bodies |
| 26 | 7.2.5.3 Rectangular cross sections Figure 7 — Calculation coefficient Bn for rectangular cross-sections |
| 27 | Figure 8 — Correction factor k for short casing bodies |
| 28 | 7.3 Wall thickness in the crotch area Figure 9 — Calculation procedure in the crotch area |
| 29 | Table 4 — Calculation formulae 7.4 Examples of pressure-loaded areas Ap and metallic cross-sectional areas Af 7.4.1 General |
| 30 | 7.4.2 Cylindrical valve bodies Figure 10 — Cylindrical valve body |
| 31 | Figure 11 — Angle valve Figure 12 — Angle screw-down valve |
| 32 | Figure 13 — Cylindrical valve body with oblique branch Figure 14 — Angle pattern valve body 7.4.3 Spherical valve bodies |
| 33 | Figure 15 — Spherical valve body 7.4.4 Oval and rectangular cross-sections |
| 34 | 7.4.5 Details Figure 16 — Example of a closure |
| 35 | Figure 17 — Example of an end connection Figure 18 — Example of an end connection |
| 36 | Figure 19 — Example of a flanged connection with blind holes Figure 20 — Example of a thick-walled body |
| 37 | Figure 21 — Example of opening reinforcement Figure 22 — Examples of opening reinforcement 8 Calculation methods for bonnets and covers 8.1 General 8.2 Covers made of flat plates 8.2.1 General |
| 38 | Figure 23 — Calculation coefficient Cy for flat plates with supplementary marginal moment acting in the same sense as the pressure load |
| 39 | Figure 24 — Opening factor Cz for flat plates with additional marginal moment |
| 41 | Figure 25 — Calculation coefficient Cx for rectangular (1) or elliptical flat plates (2) |
| 42 | 8.2.2 Circular cover without opening, with Figure 26 — Cover (direct loading) with full face gasket Figure 27 — Cover with gasket (direct loading) entirely within the bolt circle |
| 43 | Figure 28 — Cover with gasket (not subjected to direct loading) entirely within the bolt circle 8.2.3 Circular covers with concentric circular opening, with Figure 29 — Cover with gasket (direct loading) entirely within the bolt circle Figure 30 — Cover with gasket (not subjected to direct loading) entirely within the bolt circle |
| 44 | Figure 31 — Cover with central nozzle gasket (direct loading) entirely within the bolt circle 8.2.4 Non-circular covers (elliptical or rectangular) |
| 45 | Figure 33 — Diameter of non-circular covers 8.2.5 Special covers made of flat circular plates for specific load and clamping conditions |
| 46 | Figure 34 — Calculation coefficients BP, BF and BM Figure 35 — Flat plate with annular groove |
| 48 | Table 5 — Flat circular plates and annular plates — Bending moments as a function of load cases and clamping conditions |
| 56 | Table 6 — Application cases of circular plates with non-reinforced centre hole and with reinforced centre hole |
| 57 | 8.3 Covers consisting of a spherically domed end and an adjoining flanged ring 8.3.1 General Figure 36 — Spherically domed end |
| 58 | Figure 37 — Deep dishes spherically domed end 8.3.2 Wall thickness and strength calculation of the spherical segment |
| 59 | Figure 38 — Calculation coefficient 8.3.3 Calculation of the flanged ring 8.3.3.1 Strength condition 8.3.3.2 Forces and moments of Formulae (126) and (127) |
| 60 | 8.3.3.3 Forces in the moment Formulae (129) and (130) Table 7 — Lever arms of the forces in the moment formulae |
| 61 | 8.3.3.4 Other geometrical dimensions in the Formulae (126) and (127) 8.3.3.5 Diameter of centre of gravity 8.3.4 Reinforcement of the stuffing box area 8.4 Dished heads 8.4.1 General remarks |
| 62 | 8.4.2 Solid dished heads Figure 39 — Solid dished head |
| 63 | Figure 40 — Calculation coefficient β 8.4.3 Dished heads with opening Figure 41 — Dished head with opening |
| 64 | Figure 42 — Dished head with branch (welded-in tubular reinforcement) Figure 43 — Dished head with necked opening |
| 65 | Figure 44 — Dished head with disc-shaped reinforcement 8.4.4 Allowances on the wall thickness |
| 66 | 9 Calculation method for pressure sealed bonnets and covers Figure 45 — Self-sealing closure |
| 68 | 10 Calculation methods for flanges 10.1 General Figure 46 — Types of flange connections 10.2 Circular flanges 10.2.1 General |
| 69 | 10.2.2 Flanges with tapered neck |
| 70 | Figure 47 — Flange with tapered neck |
| 71 | 10.2.3 Flanges greater than DN 1 000 |
| 72 | 10.2.4 Welding neck with tapered neck according to Figure 48 Figure 48 — Welding neck with tapered neck |
| 73 | 10.2.5 Weld-on flanges 10.2.5.1 Weld-on flanges in accordance with Figure 49, design A and design B, and integral flange in accordance with Figure 50 Figure 49 — Weld-on flanges Figure 50 — Integral flange |
| 74 | 10.2.5.2 Welded-on collars in accordance with Figure 51 Figure 51 — Welded-on collar |
| 75 | Table 8 — Field of application of various weld-on flanges |
| 76 | 10.2.6 Reverse flanges Figure 52 — Reverse flange 10.2.7 Loose flanges |
| 77 | Figure 53 — Loose flange |
| 78 | 10.3 Oval flanges 10.3.1 Oval flanges in accordance with Figure 54 Figure 54 — Oval flange with two bolts |
| 80 | 10.3.2 Oval flanges in accordance with Figure 55 Figure 55 — Oval flange with more than two bolts |
| 81 | Figure 56 — Correction factor B5 of Formula (217) |
| 82 | 10.4 Rectangular or square flanges 10.4.1 Rectangular or square flanges in accordance with Figure 57 Figure 57 — Rectangular or square flange 10.4.2 Rectangular slip-on flanges in accordance with Figure 58 Figure 58 — Rectangular or square slip-on flange |
| 83 | 10.5 Calculation of the bolt diameter 10.5.1 Design temperature 10.5.2 Diameter of the nominal tensile stress |
| 84 | 10.5.3 Load cases 10.5.4 Safety factors and allowances Table 9 — Safety factors 11 Calculation methods for glands 11.1 Loads |
| 85 | 11.2 Gland bolts 11.3 Gland flanges 11.4 Other components 12 Fatigue 13 Marking |
| 86 | Annex A (informative) Characteristic values of gaskets and joints |
| 87 | Table A.1 — Characteristic values of gaskets and joints |
| 98 | Annex B (informative) Calculation procedure Figure B.1 — Sections for calculating the strength of valve bodies with branch |
| 100 | Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC (PED) |
| 101 | Bibliography |
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BS EN 12516-2:2014+A1:2021
Industrial valves. Shell design strength – Calculation method for steel valve shells Published By Publication…
