Measuring and testing – Volume or rate of flow – System
Patent
1987-06-22
1988-06-28
Noland, Tom
Measuring and testing
Volume or rate of flow
System
73 3, G01F 2500
Patent
active
047530952
ABSTRACT:
A method and apparatus for determining the gas flow rate in a high pressure critical flow nozzle is disclosed. A high pressure gas flows through a first critical flow nozzle. Upstream of the first critical flow nozzle a small slip-stream of gas is removed and flows through a smaller second critical flow nozzle. The small second critical flow nozzle drops the pressure of the gas to a low level. This flow rate of this low pressure gas stream is measured in a highly accurate low pressure gas flow rate measuring device. Since the flow rate in this device must be the same as that of the second critical flow nozzle, a correction factor can be calculated for the second critical flow nozzle. This flow rate correction factor will be the same for the first critical flow nozzle.
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Technology Section Oil and Gas Journal; Emrys H. Jones Jr. et al.; "Chevron Facility Focused on Commercial Orifice-Meter Research"; pp. 60-63, Jul. 27, 1987 Edition and Research Yields Precise Uncertainty Equations; the concluding portion on pp. 39-43 of the Aug. 3, 1987 Edition.
Jackson Robert E.
Jones, Jr. Emrys H.
Chevron Research Company
Keeling E. J.
La Paglia S. R.
Noland Tom
Schaal E. A.
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