ANSI/ISA-75.01.01 : 2012

ANSI/ISA-75.01.01-2012 (60534-2-1 MOD), Industrial-Process Control Valves – Part 2-1: Flow Capacity – Sizing Equations for Fluid Flow Under Installed Conditions, provides detailed sizing equations and methodologies for predicting fluid flow through control valves under installed conditions. It addresses both incompressible and compressible fluids, considering turbulent and non-turbulent flow regimes and includes correction factors for piping geometry and valve fittings. This standard introduces key parameters such as pressure differentials, expansion factors, specific heat ratios and Reynolds numbers that measure fluid flow. It offers specialized guidance for multistage control valves, focusing on stage interaction and reheat factors. It also includes extensive normative and informative annexes that provide additional equations, computational methods, typical valve coefficients and reference calculations to support accurate valve sizing across various industrial applications.