NBN EN ISO 5167-4 : 2003

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of the method of measurement and computation
5 Classical Venturi tubes
   5.1 Field of application
   5.2 General shape
   5.3 Material and manufacture
   5.4 Pressure tappings
   5.5 Discharge coefficient, C
   5.6 Expansibility [expansion] factor, [epsilon]
   5.7 Uncertainty of the discharge coefficient, C
   5.8 Uncertainty of the expansibility [expansion]
        factor [epsilon]
   5.9 Pressure loss
6 Installation requirements
   6.1 General
   6.2 Minimum upstream and downstream straight lengths
        for installation between various fittings and the
        Venturi tube
   6.3 Flow conditioners
   6.4 Additional specific installation requirements
        for classical Venturi tubes
Annex A (informative) Table of expansibility [expansion]
         factor
Annex B (informative) Classical Venturi tubes used
         outside the scope of ISO 5167-4
Annex C (informative) Pressure loss in a classical
         Venturi tube
Bibliography

Defines the geometry and method of use (installation and operating conditions) of Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit.