PD 6550-4:1989

Foreword
Committees responsible
1. Introduction
2. A brief history and a comparison of design methods
3. Perforated plates
3.1 The variables used in BS 5500
3.2 Flexural efficiency
3.3 Ligament efficiency
4. Floating head and U-tube exchangers
4.1 Allowable stress in bending
4.2 The plate on an elastic foundation xa, U and V
4.3 The factors which affect C
4.4 Tube longitudinal stresses Wto to Wti
4.5 Shear
5. Fixed tubesheet heat exchangers
5.1 Equations for bending and shear
5.2 Design effective pressures: p'1 and p'2
5.3 The term (1 + JKFq)
5.4 The components: p's, p't and pe
5.5 Load case combination
5.6 Edge support factor F
5.7 Shell and tube longitudinal stresses
6. Allowable shell and tube longitudinal stresses
7. References
Tables
1. BS 5500 formulae for tubesheet bending
2. Comparison of the constants
3. Normal load cases
Figures
1. Exchanger types
2. Tubesheet as a plate on an elastic foundation
3. Circular plate under edge bending moment
4. Characteristics of thick and thin plates
5. Effective constants (experimental)
6. Geometry and loading in theoretical analysis
7. Plate effective constants (theoretical)
8. Variation of Mr across the tubesheet for different
     edge conditions
9. Variation of Fm with xa
10. Effect of factor K
11. Variation of q across the tubesheet for different
     edge conditions
12. Variation of Fq with xa
13. Tubesheet loadings
14. Variation of edge support factor F with xa
15. Tube buckling stresses

Deals with the three particular problems presented; the tubesheet is highly perforated; in floating head fixed tubesheet exchangers, the tube bundle, tubesheets, and shell form astatically indeterminate structure; tubesheets experience different combinations of pressure and thermal load under different phases of operation.