SAME AS IEC 60534-2-1
This standard includes equations for predicting the flow ofcompressible and incompressible fluids through control valves.
The equations for incompressible flow are based on standardhydrodynamic equations for Newtonian incompressible fluids. Theyare not intended for use when non-Newtonian fluids, fluid mixtures,slurries or liquid-solid conveyance systems are encountered. Theequations for incompressible flow may be used with caution fornon-vaporizing multi-component liquid mixtures. Refer to Clause 6for additional information.
At very low ratios of pressure differential to absolute inletpressure ( ΔP/P1), compressible fluids behavesimilarly to incompressible fluids. Under such conditions, thesizing equations for compressible flow can be traced to thestandard hydrodynamic equations for Newtonian incompressiblefluids. However, increasing values of ΔP/P1result in compressibility effects which require that the basicequations be modified by appropriate correction factors. Theequations for compressible fluids are for use with ideal gas orvapor and are not intended for use with multiphase streams such asgas-liquid, vapor-liquid or gas-solid mixtures. Reasonable accuracycan only be maintained when the specific heat ratio, gamma , isrestricted to the range 1.08 < gamma < 1.65. Refer toClause 7.2 for more information.
For compressible fluid applications, this standard is valid forvalves with xT > 0.84 (see Table D.2). Forvalves with xT > 0.84 (e.g. somemultistage valves), greater inaccuracy of flow prediction can beexpected.
- Edition:
- 12
- Published:
- 08/27/2012
- ANSI:
- ANSI Approved
- Number of Pages:
- 70
- File Size:
- 1 file , 1.4 MB
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