ISO 9300:2005-08

Measurement of gas flow by means of critical flow Venturi nozzles

German title: Durchflussmessung von Gasen mit Venturidüsen bei kritischer Strömung
Publication date: 2005-08
Original language: English
Pages: 38

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Publication date: 2005-08
Original language: English
Pages: 38

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Content
ICS
Replacement amendments
Cooperation at DIN

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Content

Content (en)

Foreword
Scope
Terms and definitions
- Pressure measurement
- Temperature measurement
- Venturi nozzles
- Flow
Symbols
Basic equations
- State equation
- Flow-rate under ideal conditions
- Flow-rate under real conditions
- Critical mass flux
Applications for which the method is suitable
Standard critical flow Venturi nozzles (CFVN)
- General requirements
  - Materials
  - Surface finish of the throat and the inlet
  - Conical divergent
- Design
  - General
  - Toroidal-throat Venturi nozzle
  - Cylindrical-throat Venturi nozzles
Installation requirements
- General
- Upstream pipeline
- Large upstream space
- Downstream requirements
- Pressure measurement
- Drain holes
- Temperature measurement
- Density measurement
- Calculated density
Calculation methods
- Mass flow-rate
- Discharge coefficient, C
- Critical flow function, C, and real gas critical flow coefficient, C
- Conversion of measured pressure and temperature to stagnation conditions
- Maximum permissible downstream pressure
Uncertainties in the measurement of flow-rate
- General
- Practical computation of uncertainty
Venturi nozzle discharge coefficients (normative)
Tables of values for critical flow function C — Various gases (normative)
- General
- Tables
- Empirical equation
- Atmospheric air
- Nozzle throat to pipe diameter ratio, β
- C values and coefficients for Equation (B.1)
Computation of critical mass flux for natural gas mixtures (normative)
- General
- Correlation
- Nozzle throat to pipe diameter ratio, β
- Sample values for computer code verification
Mass flow correction factor for atmospheric air (normative)
- General
- Sample values for computer code verification
Computation of critical mass flux for critical flow nozzles with high nozzle throat to upstream pipe diameter ratio, β > 0,25 (normative)
- General
- Correction factors
Bibliography

ICS

17.120.10

Replacement amendments

This document replaces ISO 9300:1990-08 .

This document has been replaced by: ISO 9300:2022-06 .

Cooperation at DIN

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