Improved control valve sizing for multiphase flow

摘要

Control valves are frequently used in chemical and pet-rochemical 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 (C_(nu) or kappa_(nu) 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.