BS 1042-1.3(1991) : 1991 AMD 8878

Name: BS 1042-1.3(1991) : 1991 AMD 8878
Brand: BSI

Superseded

View Superseded by

MEASUREMENT OF FLUID FLOW IN CLOSED CIRCUITS - PRESSURE DIFFERENTIAL DEVICES - METHOD OF MEASUREMENT OF GAS FLOW BY MEANS OF CRITICAL FLOW VENTURI NOZZLES

Superseded date

12-15-1995

Published date

11-23-2012

Publisher

British Standards Institution

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

Describes the geometry and method of use of critical flow Venturi nozzles used to determine the mass flow-rate of a gas flowing through a system. It gives the information necessary for calculating the flow-rate and its associated uncertainty. Applies to Venture nozzles in which the gas flow accelerates to the critical velocity at the throat. Applicable only where there is steady flow of single-phase gases. It deals with Venturi nozzles for which direct calibration experiments have been made in sufficient number and quantity to enable inherent systems of application to be based on their results. BS AMD 8878 RENUMBERS THIS STANDARD

Committee	PCL/2
DevelopmentNote	Renumbered and superseded by BS EN ISO 9300 Supersedes 89/20802 DC (09/2005)
DocumentType	Standard
PublisherName	British Standards Institution
Status	Superseded
SupersededBy	BS EN ISO 9300:2005

Standards	Relationship
ISO 9300:2005	Identical

ISO 5168:2005	Measurement of fluid flow — Procedures for the evaluation of uncertainties
ISO 2186:2007	Fluid flow in closed conduits — Connections for pressure signal transmissions between primary and secondary elements
ISO 4006:1991	Measurement of fluid flow in closed conduits — Vocabulary and symbols