BS 1042-1.3(1991) : 1991 AMD 8878
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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MEASUREMENT OF FLUID FLOW IN CLOSED CIRCUITS - PRESSURE DIFFERENTIAL DEVICES - METHOD OF MEASUREMENT OF GAS FLOW BY MEANS OF CRITICAL FLOW VENTURI NOZZLES
15-12-1995
23-11-2012
Committees responsible
National foreword
Method
1. Scope
2. Definitions and symbols
3. Basic equations
4. Applications for which the method is suitable
5. Standard critical flow Venturi nozzles
6. Installation requirements
7. Calculation methods
8. Uncertainties in the measurement of flow-rate
Annexes
A. Venturi nozzle discharge coefficients
B. Tables of values of the critical flow function C*
for various gases
C. Computation of real gas critical flow coefficient
for natural gases
D. References from which the standard critical flow
Venturi nozzle discharge coefficients were
obtained
E. Bibliography
Tables
1. Symbols
2. Coefficients a, b and n
A.1 Toroidal throat Venturi nozzle discharge
coefficients
A.2 Cylindrical throat Venturi nozzle discharge
coefficients
B.1 Values of C* for nitrogen
B.2 Values of C* for oxygen
B.3 Values of C* for argon
B.4 Values of C* for methane
B.5 Values of C* for carbon dioxide
B.6 Values of C* for air
B.7 Values of C* for steam
C.1 Coefficient ac
C.2 Coefficient bc
Figures
1. Toroidal throat Venturi nozzle
2. Cylindrical throat Venturi nozzle
3. Installation requirements for an upstream pipe-
work configuration
4. Detail of a wall pressure tapping when an upstream
pipeline is used
5. Maximum permissible back-pressure ratio for
critical flow Venturi nozzles
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