ISA 75.01 : 1985

1 Scope
2 Introduction
2.1 Flow variable and fluid properties
3 Nomenclature
4 Incompressible fluid - flow of nonvaporizing liquid
4.1 Equations for turbulent flow
4.2 Numerical constants N
4.3 Piping geometry factor Fp
4.4 Equations for nonturbulent flow
5 Incompressible fluid - choked flow of vaporizing
     liquid
5.1 Liquid choked flow equations
5.2 Liquid pressure recovery factor FL
5.3 Combined liquid pressure recovery factor FLP
6 Compressible fluid - flow of gas and vapor
6.1 Equations for turbulent flow
6.2 Numerical constants N
6.3 Expansion factor Y
6.4 Choked flow
6.5 Pressure drop ratio factor xT
6.6 Pressure drop ratio factor with reducers or other
     fittings XTP
6.7 Ratio of specific heats factor Fk
6.8 Compressibility factor Z
7 References
Annexes
A Use of flow rate equations for sizing valves
B Derivation of factors Fp and FLP
C Control valve-piping system head changes
D Representative values of valve capacity factors
E Reynolds number factor FR
F Equations for nonturbulent liquid flow
G Liquid critical pressure ratio factor FF
H Derivation of factor xTP
I Control valve flow equations - SI notation
     (International System of Units)
J References
Figures
1 Reynolds number factor
2 Liquid flow rate versus pressure drop for a typical
     valve (constant upstream pressure and vapor pressure)
C-1 Head changes in a control valve-piping system
E-1 Reynolds number factor for valve sizing
Tables
1 Numerical constants for liquid flow equations
2 Numerical constants for gas and vapor flow equations
C-1 Definitions of head terms
D-1 Representative values of valve capacity factors
E-1 Reynolds number factor FR for transitional flow

Gives equations for prediction of the flow of compressible and incompressible fluids through control valves. Equations are not meant for use when mixed-phase fluids, dry solids, dense slurries, or non-Newtonian liquids are encountered. The prediction of noise, cavitation, or other effects is not included.