UNI EN ISO 5167-3 : 2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of the method of measurement and computation
5 Nozzles and Venturi nozzles
  5.1 ISA 1932 nozzle
  5.2 Long radius nozzles
  5.3 Venturi nozzles
6 Installation requirements
  6.1 General
  6.2 Minimum upstream and downstream straight lengths
      for installation between various fittings and the
      primary device
  6.3 Flow conditioners
  6.4 Circularity and cylindricality of the pipe
  6.5 Location of primary device and carrier rings
  6.6 Method of fixing and gaskets
Annex A (informative) Tables of discharge coefficients
         and expansibility [expansion] factors
Bibliography

Defines 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 flow-rate of the fluid flowing in the conduit.