Thermally prestressed cylindrical structure and method of making

Details Thermally prestressed cylindrical structure and method of making Thermally prestressed cylindrical structure and method of making

1991-01-18

1992-01-28

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Roller making

29110, 165 89, B21B 1302

Patent

active

050833740

ABSTRACT:
The invention is a method of prestressing a heat transfer cylinder by thermal means to create residual stresses which act to reduce the operating thermal stresses in the cylinder wall. The invention also includes a cylinder prestressed by the method. An example might be a cylindrical drum having a heat source adjacent its inner surface to be used for heating a material on its outer surface. The drum would be thermally prestressed to have residual compression stresses at its outer surface and residual tension stresses at its inner surface under conditions of no heat flow. These stresses are opposite in direction to those induced by heat flow through through the drum wall during operation.

REFERENCES:
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patent: 4710271 (1987-12-01), Miller
Froehlich, C. H., N. G. Cofie and J. R. Sheffield, IHSI Proves Its Worth, Nuclear Engineering International, Jan., 1988, pp. 47-48.
Gordon, G. M. and W. D. Miller, Implementing IGSCC Countermeasures in the U.S.A.--A Progress Report, Nuclear Engineering International, Jan. 1988, pp. 44-46.
King, Reno C. Piping Handbook, 5th Ed., McGraw-Hill, New York (1967), pp. 7-136 and 7.varies.138.
Porowski, J. S., W. J. O'Donnell, M. L. Badlani and E. J. Hampton, Using MSIP (Mechanical Stress Improvement Process) to Inhibit Igscc., Nuclear Engineering International, Nov. 1986, pp. 56-58.

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