NBN EN ISO 5167-1 : 2003

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
   4.1 Symbols
   4.2 Subscripts
5 Principle of the method of measurement and computation
   5.1 Principle of the method of measurement
   5.2 Method of determination of the diameter ratio of the
       selected standard primary device
   5.3 Computation of flowrate
   5.4 Determination of density, pressure and temperature
6 General requirements for the measurements
   6.1 Primary device
   6.2 Nature of the fluid
   6.3 Flow conditions
7 Installation requirements
   7.1 General
   7.2 Minimum upstream and downstream straight lengths
   7.3 General requirements for flow conditions at the primary
       device
   7.4 Flow conditioners (see also Annex C)
8 Uncertainties on the measurement of flow-rate
   8.1 Definition of uncertainty
   8.2 Practical computation of the uncertainty
Annex A (informative) Iterative computations
Annex B (informative) Examples of values of the pipe wall
         uniform equivalent roughness, k
Annex C (informative) Flow conditioners and flow straighteners
Bibliography

Specifies the geometry and method of use of nozzles, orifice plates and Venturi tubes and when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit. Also gives the necessary information for calculating the flow rate and its associated uncertainty. Also includes detailed definitions.