A tubesheet for U-tubesheet heat exchanger is analyzed as an equivalent solid circular plate having complete isotropy in the plane of the tubesheet with usual effective elastic constants. However, the tubesheet is expected to have different values of modulus of elasticity, modulus of rigidity, and Poisson’s ratio in the thickness direction. This anisotropic behavior of the tubesheet in thickness direction is taken into account by using the anisotropic theory of plates. When performing theoretical analysis, normal stress in thickness direction is also not assumed equal to zero. Hence, the resulting expressions for deflection and bending stresses are closer to those of a thick plate. Expression for radial stress is compared with that of an isotropic thin circular plate. Based on this comparison, certain modifications in the existing code formulas are proposed. Some design aspects related to ligament efficiency, effective elastic constants, and tubesheet edge conditions are also discussed. Proposed modifications in the design procedure may lead to six to ten percent saving in the material cost.

Issue Section:
Research Papers
Topics:
Design, Heat exchangers, Anisotropy, Elastic constants, Stress, Bending (Stress), Deflection, Elastic moduli, Isotropy, Plates (structures), Poisson ratio, Shear modulus, Theoretical analysis
1.
Ambartsumyan, S. A., 1970, Theory of Anisotropic Plates, Vol. II, Technomic Publishing Co., Stamford, CN, pp. 8–15 & 130–139.
2.
ASME Boiler and Pressure Vessel Code, 1995, Section VIII Division 1, The American Society of Mechanical Engineers, New York, NY.
3.
BS:1515 Part 1, 1965, British Standard Specification for Fusion Welded Pressure Vessels, British Standards Institution, London, U.K.
4.
BS-5500: 1994, British Standard Specification for Fusion Welded Pressure Vessels, British Standards Institution, London, U.K.
5.
CODAP, 1995, “Code Francais de construction des Appareils a Pression” French Code for the Construction of Pressure Vessels, Publication SNCT.
6.
Gardner, K. A., 1969, “Tubesheet Design; A Basis for Standardization,” First International Conference on Pressure Vessel Technology, Delft, The Netherlands, pp. 621–645.
7.
IS: Indian Standard-4503, 1967, “Specifications for Shell and Tube Type Heat Exchanger,” Indian Standard Institution, New Delhi, India, pp. 56–62.
8.
ISO/DIS 2694, 1973, Pressure Vessels.
9.
Meijers, P., 1980, “Refined Theory for Bending of Perforated Plates,” Delft University of Technology, Delft, The Netherlands, Report No. 679, Laboratory of Engineering Mechanics, pp. 7–19.
10.
Miller, K. A. G., 1952, “The Design of Tube Plate in Heat Exchangers,” Proceedings of Institution of Mechanical Engineers, Ser. B., London, U.K., Vol. 1, pp. 672–688.
11.
Osweiller
 
F.
,
1989
, “
Evolution and Synthesis of the Effective Elastic Constants Concept for the Design of Tubesheets
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
111
, pp.
209
–
216
.
12.
Osweiller
 
F.
,
1992
, “
Basis of the Tubesheet Heat Exchanger Design Rules Used in the French Pressure Vessel Code
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
114
, pp.
124
–
131
.
13.
Podhorsky, M., 1988, “Design of Modern Heat Exchangers using Hydraulic Tube Expansion,” Proceedings of Sixth International Conference of Pressure Vessel Technology, Beijing, Peoples Republic of China, pp. 349–358.
14.
Porowski
 
J. S.
, and
O’Donnell
 
W. J.
,
1978
, “
Elastic Design Methods for Perforated Plates
,”
ASME Journal of Engineering for Power
, Vol.
100
, pp.
356
–
362
.
15.
Slot
 
T.
, and
O’Donnell
 
W. J.
,
1971
, “
Effective Elastic Constants for Thick Perforated Plates with Square and Triangular Penetration Patterns
,”
ASME Journal of Engineering for Industry
, Vol.
93
, pp.
1081
–
1088
.
16.
TEMA, 1988, Standards of Tubular Exchanger Manufacturers Association, Seventh Edition.
17.
Terakawa
 
T.
,
Imai
 
A.
,
Yagi
 
K.
,
Fukuda
 
Y.
, and
Okada
 
K.
,
1984
, “
Stiffening Effects of Tubes in Heat Exchanger Tubesheet
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
106
, pp.
237
–
246
.
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