To extend the range of usefulness of a water calibrated metering constriction in the field of gas flow measurement, a method is described for determining the expansion coefficient (∈) which does not involve measurement of gas flow rate, while the precision of the method is such as to achieve accuracy tolerances of the order ±0· 30%. When used in conjunction with flow coefficients appropriate to incompressible flow, the flow coefficient appropriate to compressible flow is determined with an overall tolerance well within the limits ±0· 5% over a range of ∈ of 1 > ∈ > 0· 90.
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References
1.
British Standards Institution, BS 1042; ‘Part 1; 1964 — Methods for the measurement of fluid flow in pipes’.
2.
American Society of Mechanical Engineers. ‘Fluid meters — their theory and application’. 5th edition (1959).
