Method for measuring flow rate and direction of a fluid in a con

Details Method for measuring flow rate and direction of a fluid in a con Method for measuring flow rate and direction of a fluid in a con

1994-09-30

1996-04-23

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

73861067, 73861066, G01F 146

Patent

active

055093132

ABSTRACT:
A method of measuring fluid flow through a conduit first finds a null position then rotates the probe 90.degree. from the null position to be aligned with the true flow direction of the field. The null position is found by incremental movement of the probe through selected angles. At each position a differential pressure reading is taken. These readings are then compared to determine subsequent incremental movements to identify an approximate null position. The true null position is found from the approximate null by applying at least squares fit to differential pressure readings taken within a range, preferably +/-5.degree., around the approximate null. The probe is then rotated 90.degree. from the null position. A plurality of differential pressure readings are taken and the square root of each such reading is found. An average of those square roots is multiplied by a predetermined constant to find the flow rate.

REFERENCES:
patent: 2706409 (1955-04-01), Preston
patent: 3997249 (1976-08-01), Wittig
patent: 4654813 (1987-03-01), Edlund et al.
patent: 5209258 (1993-05-01), Sharp et al.
patent: 5394759 (1995-03-01), Traina
patent: 5440217 (1995-08-01), Traina
Technisches Messen Tm, vol. 48, No. 6, Jun. 1981, Munchen De, pp. 229-232, J. Wachter, E. A., "Automatischer Nullabgleich for Stromungssonden".
Appendix A, Methods 1 and 2 of 40 Code of Federal Regulations, Part 60, Jul. 1, 1992.

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