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Principle of the method of measurement and computation
Uncertainties on the measurement of flow rates
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annular slot axial centre-line axial planes carrier ring classical venturi tube convergent section corner tappings cross-section cylindrical throat deviation diameter ratio differ dimensionless discharge coefficient divergent section downstream face drain holes ellipse entrance cylinder equal EXPANSIBILITY EXPANSION figure flange taps Flow coefficient flow measurement fluid flow formula is applicable given for convenience given in tables installation intended for precise internal surface International Standard ISA 1932 nozzle isentropic exponent joining curvature known without error limits given long radius nozzles machined convergent manufacture mean diameter minimum straight lengths nozzles and venturi percentage uncertainty pipe diameter pipe wall plates with flange precise interpolation pressure loss pressure measured primary device radius of curvature rate of flow Reynolds number specific heat capacities static pressure straightener surface of revolution throat pressure tappings type of classical upstream and downstream upstream face upstream pipe upstream pressure tapping upstream tapping venturi nozzles viscosity zero additional uncertainty