I.S. 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 requirement for flow conditions at the primary device
  7.4 Flow conditioners (see also Annex C)
8 Uncertainties on the measurement of flowrate
  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

Covers the geometry and method of use (installation and operating conditions) of orifice plates, nozzles and Venturi tubes when they are inserted in a conduit running full to determine the flow-rate of the fluid flowing in the conduit. Also gives necessary information for calculating the flow-rate and its associated uncertainty.