Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1986-06-16
1987-11-17
Noland, Tom
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73196, G01F 2500
Patent
active
047064927
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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"Tables of Critical Flow Functions and Thermodynamic Properties for Methane and Computational Procedures for both Methane and Natural Gas"; NASA Special Report, NASA SP-3074, 174 pages, Robert C. Johnson, published 1972.
"An Accurate Gas Metering System for Laminar Flow Studies"; The Review of Scientific Instruments, vol. 20, No. 1, pp. 61-66; Jan. 1949; J. W. Andersen et al.
Jackson Robert E.
Jones, Jr. Emrys H.
Chevron Research Company
Keeling E. J.
La Paglia S. R.
Noland Tom
Norviel V. A.
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