Isentropic Expansion of Dry Saturated Vapor—Application to the Design of Safety Valves

[+] Author and Article Information
P. Copigneaux

SPEICHIM, Bondy, France

P. Tobaly, M. Godin

Laboratoire de Thermique Industrielle, Universite Paris XII, Creteil, France

J. Pressure Vessel Technol 106(3), 282-286 (Aug 01, 1984) (5 pages) doi:10.1115/1.3264345 History: Received April 30, 1982; Revised February 29, 1984; Online November 05, 2009


Accepted standards relative to the design of safety valves are based on calculations of the maximum (flow rate) during isentropic expansion through a converging nozzle. The theoretical value is then corrected with an empirical coefficient K d for a better approach of reality. In this paper, after reviewing the calculation which is the basis for the various existing standards, we indicate the limits of their applications and present a more rigorous method in the case of saturated vapors as well as the first results of systematic computer calculations.

Copyright © 1984 by ASME
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