BS EN ISO 5167-3:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full. Nozzles and Venturi nozzles
This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of
nozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flowrate of the
fluid flowing in the conduit.
This part of ISO 5167 also provides background information for calculating the flowrate and is applicable in
conjunction with the requirements given in ISO 5167-1.
This part of ISO 5167 is applicable to nozzles and Venturi nozzles in which the flow remains subsonic
throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of
the devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable to
the measurement of pulsating flow. It does not cover the use of nozzles and Venturi nozzles in pipe sizes less
than 50 mm or more than 630 mm, or where the pipe Reynolds numbers are below 10 000.
This part of ISO 5167 deals with
a) two types of standard nozzles:
1) the ISA5) 1932 nozzle;
2) the long radius nozzle6);
b) the Venturi nozzle.
The two types of standard nozzle are fundamentally different and are described separately in this part of
ISO 5167. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent
section and, therefore, a different location for the downstream pressure tappings, and is described separately.
This design has a lower pressure loss than a similar nozzle. For both of these nozzles and for the Venturi
nozzle direct calibration experiments have been made, sufficient in number, spread and quality to enable
coherent systems of application to be based on their results and coefficients to be given with certain
predictable limits of uncertainty.
BS EN ISO 5167-3:2003 history
2022BS EN ISO 5167-3:2022 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Nozzles and Venturi nozzles
2020BS EN ISO 5167-3:2020 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full-Nozzles and Venturi nozzles
2003BS EN ISO 5167-3:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full. Nozzles and Venturi nozzles