0
Research Papers: Materials and Fabrication

Fatigue Stress Evaluation at Shell-to-Bottom Joint With Double Plastic Hinge in Elevated Temperature Steel Tanks on Concrete Ring Walls

[+] Author and Article Information
Sridhar Sathyanarayanan

Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John's, NF A1B 3X5, Canada
e-mail: ssridhar@mun.ca

Seshu M. R. Adluri

Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John's, NF A1B 3X5, Canada
e-mail: adluri@mun.ca

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 16, 2012; final manuscript received March 13, 2014; published online February 23, 2015. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 137(4), 041408 (Aug 01, 2015) (8 pages) Paper No: PVT-12-1130; doi: 10.1115/1.4027202 History: Received August 16, 2012; Revised March 13, 2014; Online February 23, 2015

The shell-to-bottom joint of hydrocarbon storage tanks is a critical location which may experience fatigue cracking and requires evaluation of the local cyclic stresses especially in the case of elevated temperature tanks. The fill/draw down cycle of the stored liquid causes low cycle fatigue near this joint and hence a fatigue evaluation is recommended. The peak alternating stress at this location, used to enter the fatigue curves is currently determined using a pseudo-elastic analysis that represents strain range due to inelastic deformations. API 650 employs beam on elastic foundation theory for this analysis. This theory is being used for tanks resting fully on earthen foundation as well as those on concrete ring wall. This paper studies the validity of using this theory for tanks with concrete ring wall foundation which are much more rigid compared to earthen foundations. Some of the difficulties in the current practice are highlighted. An alternative to the current model is presented for the determination of stresses in such tanks. The results are validated using finite element analysis. The results show that the current practice needs to be revised or rejustified in an alternative manner.

Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Denham, J. B., Russel, J., and Wills, C. M. R., 1968, “Comparison of Predicted and Measured Stresses in a Large Storage Tank,” Proc. of Division of Refining—API, pp. 1034–1074.
Denham, J. B., Russell, J., and Wills, C. M. R., 1968, “How to Design a 600,000-BBL Tank,” Hydrocarbon Process., 47(5), pp. 137–142.
Wu, T. Y., and Liu, G. R., 2000, “Comparison of Design Methods for a Tank-Bottom Annular Plate and Concrete Ring Wall,” Int. J. Pressure Vessels Piping, 77, pp. 511–517. [CrossRef]
Sathyanarayanan, S., and Adluri, S. M. R., 2011, “Effect of Annular Plate Projection Length on the Stresses in the Above Ground Steel Storage Tanks on Rigid Ring Wall Foundations,” ASME Paper No. PVP2011-57988 [CrossRef].
API 650, 2013, Welded Tanks for Oil Storage—API 650, 12th ed., American Petroleum Institute, Washington, DC.
API 653, 2009, Tank Inspection, Repair, Alteration and Reconstruction—API 653, 4th ed., American Petroleum Institute, Washington, DC.
Karcher, G. G., 1978, “Thermal Stresses in Tanks Operating at Elevated Temperatures,” Proceedings—API Division of Refining, American Petroleum Institute, New York, Vol. 57, pp. 515–521.
Karcher, G. G., 1981, “Simplified Stress Equations for Elevated Storage Tanks,” Hydrocarbon Processing, Gulf Pub. Co., Huston, TX, pp. 515–521.
Jones, R., and Seshadri, R., 1989, “Analysis and Design of High Temperature Storage Tanks,” Design and Analysis of Pressure Vessels and Components—1989 (ASME PVP Conference), Vol. 175, pp. 45–52.
Timoshenko, S., and Woinowsky-Kreiger, S., 1989, Theory of Plates and Shells, 2nd ed., McGraw-Hill, New York
Zick, L. P., and McGrath, R. V., 1968, “Design of Large Diameter Cylindrical Shells,” Proceedings—API Division of Refining, American Petroleum Institute, New York, Vol. 48, pp. 1114–1140.
Long, B., and Garner, B., 2004, Guide to Storage Tanks and Equipment, Professional Engineering Publishing, London, UK.
Sathyanarayanan, S., and Adluri, S. M. R., 2013, “Incorporation of Friction Coefficient in the Design Equations for Elevated Temperature Tanks,” ASME J. Pressure Vessel Technol., 135(2), p. 021205. [CrossRef]
Adluri, S. M. R., 2012, “Effects of Friction on the Bottom Plate of Large Elevated Temperature Steel Tanks,” Res. Report, Memorial University, St. John's, NL, Canada.
Hetényi, M., 1971, Beams on Elastic Foundation: Theory With Applications in the Fields of Civil and Mechanical Engineering , University of Michigan Press, Ann Arbor, MI.
ASME, 2002, ASME Boiler and Pressure Vessel Code, Section VIII, Division.2, American Society of Mechanical Engineers, New York.
ansys, 2011, University Research Version 11.0, SASIP, Inc., Canonsburg, PA.
ansys, 2011, Contact Technology Guide, SASIP, Inc., Canonsburg, PA.

Figures

Grahic Jump Location
Fig. 1

Shell-to-bottom joint in the tank with ring wall foundation

Grahic Jump Location
Fig. 2

Slope in the shell at the bottom joint

Grahic Jump Location
Fig. 3

Uplift at shell-to-bottom joint of a tank on concrete ring wall [12]

Grahic Jump Location
Fig. 4

Target element geometry (ansys)

Grahic Jump Location
Fig. 5

Typical plane element axisymmetric mesh

Grahic Jump Location
Fig. 6

Dimensions of tank used for finite element analysis

Grahic Jump Location
Fig. 7

Uplift of bottom plate and stresses using nonlinear FE model with plane elements

Grahic Jump Location
Fig. 8

Idealized beam model

Grahic Jump Location
Fig. 9

Uplift deformation of bottom plate

Grahic Jump Location
Fig. 10

Uplift deformation from FE model with shell elements

Grahic Jump Location
Fig. 11

Radial stress in bottom plate along the radius

Grahic Jump Location
Fig. 12

Bending and von Mises stress in 6 mm thick bottom plate (on the inside)

Grahic Jump Location
Fig. 13

Bending (radial) stress in 6 mm bottom plate (on the outside)

Grahic Jump Location
Fig. 14

Bending and von Mises stress in 8 mm thick bottom plate (on the inside)

Grahic Jump Location
Fig. 15

Bending of bottom plate at shell-to-bottom joint [11]

Grahic Jump Location
Fig. 16

Influence of bottom moment on tank wall bending stresses

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In