ISO 10790:2015

INTERNATIONAL ISO
STANDARD 10790
Third edition
2015-04-01
Measurement of fluid flow in closed
conduits — Guidance to the selection,
installation and use of Coriolis
flowmeters (mass flow, density and
volume flow measurements)
Mesure de débit des fluides dans les conduites fermées — Lignes
directrices pour la sélection, l’installation et l’utilisation des
mesureurs à effet Coriolis (mesurages de débit-masse, masse
volumique et débit-volume)
Reference number
©
ISO 2015
© ISO 2015
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Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Definitions specific to this Coriolis flowmeter standard . 1
3.2 Definitions from VIM, ISO/IEC Guide 99 (JCGM:2012) . 3
3.3 Symbols . 4
3.4 Abbrevations . 5
4 Coriolis flowmeter selection criteria . 5
4.1 General . 5
4.2 Physical installation . 5
4.2.1 General. 5
4.2.2 Installation criteria . 6
4.2.3 Full-pipe requirement for liquids . 6
4.2.4 Orientation . 6
4.2.5 Flow conditions and straight length requirements . 6
4.2.6 Valves . 6
4.2.7 Cleaning . 6
4.2.8 Hydraulic and mechanical vibrations . 7
4.2.9 Pipe stress and torsion . 7
4.2.10 Crosstalk between sensors . 7
4.3 Effects due to process conditions and fluid properties . 7
4.3.1 General. 7
4.3.2 Application and fluid properties . 7
4.3.3 Multiphase flow . 8
4.3.4 Influence of process fluid . 8
4.3.5 Temperature effects . 8
4.3.6 Pressure effects . 9
4.3.7 Pulsating flow effects . 9
4.3.8 Viscosity effects . 9
4.3.9 Flashing and/or cavitation . 9
4.4 Pressure loss . 9
4.5 Safety . 9
4.5.1 General. 9
4.5.2 Hydrostatic pressure test . 9
4.5.3 Mechanical stress .10
4.5.4 Erosion.10
4.5.5 Corrosion .10
4.5.6 Housing design .10
4.5.7 Cleaning .10
4.6 Transmitter (secondary device) .10
4.7 Diagnostics .11
5 Inspection and compliance .11
6 Mass flow measurement .12
6.1 Apparatus .12
6.1.1 Principle of operation .12
6.1.2 Coriolis sensor .14
6.1.3 Coriolis transmitter .15
6.2 Mass flow measurement .15
6.3 Factors affecting mass flow measurement.17
6.3.1 Density and viscosity .17
6.3.2 Multiphase flow .17
6.3.3 Temperature .18
6.3.4 Pressure .18
6.3.5 Installation .18
6.4 Zero adjustment .18
6.5 Calibration of mass flow measurement .18
7 Density measurement .19
7.1 General .19
7.2 Principle of operation .20
7.3 Specific gravity of fluids .21
7.4 Density measurement uncertainty .21
7.5 Factors affecting density measurement .21
7.5.1 Temperature .21
7.5.2 Pressure .22
7.5.3 Multiphase (Two phase).22
7.5.4 Flow effect .22
7.5.5 Corrosion and erosion . .22
7.5.6 Coatings .22
7.5.7 Installation .22
7.6 Density calibration and adjustment .22
7.6.1 General.
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