EN ISO 9300:2005 (edition 2)
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
28-02-2006
15-08-2005
Foreword
1 Scope
2 Terms and definitions
2.1 Pressure measurement
2.2 Temperature measurement
2.3 Venturi nozzles
2.4 Flow
3 Symbols
4 Basic equations
4.1 State equation
4.2 Flow-rate under ideal conditions
4.3 Flow-rate under real conditions
4.4 Critical mass flux
5 Applications for which the method is suitable
6 Standard critical flow Venturi nozzles (CFVN)
6.1 General require
6.2 Design
7 Installation requirements
7.1 General
7.2 Upstream pipeline
7.3 Large upstream space
7.4 Downstream requirements
7.5 Pressure measurement
7.6 Drain holes
7.7 Temperature measurement
7.8 Density measurement
7.9 Calculated density
8 Calculation methods
8.1 Mass flow-rate
8.2 Discharge coefficient, C[d']
8.3 Critical flow function, C[*], and real gas critical
flow coefficient, C[R]
8.4 Conversion of measured pressure and temperature to
stagnation conditions
8.5 Maximum permissible downstream pressure
9 Uncertainties in the measurement of flow-rate
9.1 General
9.2 Practical computation of uncertainty
Annex A (normative) Venturi nozzle discharge coefficients
Annex B (normative) Tables of values for critical flow
function C[*] - Various gases
Annex C (normative) Computation of critical mass flux for
natural gas mixtures
Annex D (normative) Mass flow correction factor for
atmospheric air
Annex E (normative) Computation of critical mass flux for
critical flow nozzles with high
nozzle throat to upstream pipe diameter
ratio, beta > 0,25
Bibliography
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