Background of New Code Rules for Integral Flat Heads with a Large, Central Nozzle

[+] Author and Article Information
R. W. Schneider

Bonney Forge, G & W Manufacturing Co., Allentown, Pa. 18105

J. Pressure Vessel Technol 103(1), 116-119 (Feb 01, 1981) (4 pages) doi:10.1115/1.3263360 History: Online November 05, 2009


Paragraph UG-39 (c) of ASME Section VIII, Division 1, 1980 Edition states: “Flat heads that have an opening with a diameter that exceeds one-half of the head diameter or shortest span, as defined in UG-34, shall be designed as a flange in accordance with the Rules for Bolted Flange Connections given in Appendix 2.” The application of Appendix 2 to such configurations is subject to various interpretations, accordingly, rules have been written for the specific case of a single, large central opening (nozzle) in integral flat heads. The new rules will appear in the Winter 1980 Addenda; for configurations not provided for the designer is referred to U-2 (g).

Copyright © 1981 by ASME
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