March 2005

Special Report: Instruments and Networks

Improved valve sizing for multiphase flow

HNE-DS method is based on an expansion factor similar to the gaseous media to account for changes in mixture density

Kiesbauer, J., Samson AG; Diener, R., BASF AG; Schmidt, J., c/o BASF AG

Control valves are frequently used in chemical and petrochemical plants to control medium mixtures that comprise a gas/ vapor phase as well as a liquid phase as they enter the valve. The IEC 60534-2-1 Standard is primarily applied to calculate the required valve flow capacity (Cv or kv coefficient) for single-phase media in the form of gases or liquids. However, this standard does not apply to multiphase flow. A standardized sizing model does not exist even in literature. As a consequence, plant operators and manufacturers employ various published methods according to their own experience, which may lead to considerably different results depending on the operating and medium data involved.

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