THE EXPANSIBILITY CORRECTION FOR ORIFICE PLATES - EEC DATA
The EEC project on orifice plate coefficients has addressed many questions, one of which was the accuracy of the formula for the expansibility correction, epsilON. Tests have been carried out on a 100 mm diameter orifice run in three different laboratories using air and two types of natural gas, and from these it has been possible to derive estimates of epsilON. Extremely good agreement was obtained in the three sets of results and these suggest that the existing formula, used in almost all national and international standards, underestimates epsilON. The error ranges from zero at epsilON = 0 to over 0.5 per cent at epsilON = 0.95. A modified formula, derived from the test data, is proposed, but further tests using a larger number of orifice plates would be desirable to establish the revised formula with more confidence.
Bibliographic Reference: EUR 10792 EN (1986) MF, 28 P., BFR 150, BLOW-UP COPY BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989125026300 / Last updated on: 1987-03-01
Available languages: en