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

ISO 5167-1:2003 defines terms and symbols and establishes the general principles for methods of measurement and computation of the flowrate of fluid flowing in a conduit by means of pressure differential devices (orifice plates, nozzles and Venturi tubes) when they are inserted into a circular cross-section conduit running full. ISO 5167-1:2003 also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flowrate. It also defines the general specified limits of pipe size and Reynolds number for which these pressure differential devices are to be used.ISO 5167 (all parts) is applicable only to flow that remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. It is not applicable to the measurement of pulsating flow.