ISA 75.01 : 1985
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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FLOW EQUATIONS FOR SIZING CONTROL VALVES
Hardcopy
08-04-2002
English
01-01-1995
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.
DevelopmentNote |
Formerly it was ISA-S75.01 (05/2001)
|
DocumentType |
Standard
|
Pages |
52
|
PublisherName |
International Society of Automation
|
Status |
Superseded
|
SupersededBy | |
Supersedes |
ISA RP75.21 : 1989 | PROCESS DATA PRESENTATION FOR CONTROL VALVES |
06/30125909 DC : DRAFT OCT 2006 | ISO 13628-4 - PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND OPERATION OF SUBSEA PRODUCTION SYSTEMS - PART 4: SUBSEA WELLHEAD AND TREE EQUIPMENT |
FCI 86-2 : 2000 | REGULATOR TERMINOLOGY |
MIL-V-2961 Revision D:1990 | VALVES, GLOBE, PRESSURE REDUCING, GAS SERVICE |
ISA 75.25.01 : 2000 | TEST PROCEDURE FOR CONTROL VALVE RESPONSE MEASUREMENT FROM STEP INPUTS |
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