IEC 60534-2-1:2011
Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
- Standard No.
- IEC 60534-2-1:2011
- Release Date
- 2011
- Published By
- International Electrotechnical Commission (IEC)
- Status
- Replace By
- IEC 60534-2-1:2011/COR1:2015
- Latest
- IEC 60534-2-1:2011/COR1:2015
- Scope
- This part of IEC 60534 includes equations for predicting the flow of compressible and incompressible fluids through control valves. The equations for incompressible flow are based on standard hydrodynamic equations for Newtonian incompressible fluids. They are not intended for use when non-Newtonian fluids@ fluid mixtures@ slurries or liquid-solid conveyance systems are encountered. The equations for incompressible flow may be used with caution for non-vaporizing multi-component liquid mixtures. Refer to Clause 6 for additional information. At very low ratios of pressure differential to absolute inlet pressure (??p/p1)@ compressible fluids behave similarly to incompressible fluids. Under such conditions@ the sizing equations for compressible flow can be traced to the standard hydrodynamic equations for Newtonian incompressible fluids. However@ increasing values of ??p/p1 result in compressibility effects which require that the basic equations be modified by appropriate correction factors. The equations for compressible fluids are for use with ideal gas or vapor and are not intended for use with multiphase streams such as gas-liquid@ vapor-liquid or gas-solid mixtures. Reasonable accuracy can only be maintained when the specific heat ratio@ ?? is restricted to the range 1@08 lt; ??lt; 1@65. Refer to Clause 7.2 for more information. For compressible fluid applications@ this standard is valid for valves with xT ??0@84 (see Table D.2). For valves with xT gt; 0@84 (e.g. some multistage valves)@ greater inaccuracy of flow prediction can be expected. Note that while the equation structure utilized in this document departs radically from previous versions of the standard@ the basic technology is relatively unchanged. The revised equation format was adopted to simplify presentation of the various equations and improve readability of the document.
IEC 60534-2-1:2011 history
- 2015 IEC 60534-2-1:2011/COR1:2015 Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
- 2011 IEC 60534-2-1:2011 Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
- 1970 IEC 60534-2-1:1998/COR1:2000 Corrigendum 1 - Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
- 1998 IEC 60534-2-1:1998 Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
