Title: Liquid Flow through Safety Valves: Diameter Ratio Effects on Discharge Coefficients, Sizing and Stability
Authors: MORRIS Stanley david
Citation: Journal of Loss Prevention in the Process Industries vol. 9 no. 3 p. 217-224
Publication Year: 1996
JRC N°: JRC12877
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC12877
Type: Articles in periodicals and books
Abstract: There is a difference between the true discharge coefficient CD for liquid flow through a safety valve and the more familiar "coefficient" KD; this difference increases with the orifice-to-inlet diameter ratio. The use of CD or KD depends on whether the relief system design calculations are carried out in terms of static or total pressures. Confusion between CD and KD could result in undersizing of valves. These matters are discussed in this paper and the relationship between CD and KD is derived. Furthermore, a safety valve model is proposed in which the flow characteristics are described by a discharge coefficient CDn for the valve nozzle and a loss coefficient Kb for the valve body. This two-parameter model permits a more detailed description of the flow than existing models. It is found that, for some valve tipes, it is important to take account of the area change between the inlet and the orifice. The implications of this for sizing and stability are discussed.
JRC Directorate:Joint Research Centre Historical Collection

Files in This Item:
There are no files associated with this item.

Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.