Averaging pitot probe

Details Averaging pitot probe Averaging pitot probe

1990-10-10

1992-06-23

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

732025, G01F 146

Patent

active

051232880

ABSTRACT:
To measure speed of gas flow along a pipe a flowmeter is used comprising a gas flow sensor connected by tubing with an averaging pitot probe formed by first and second tubes of circular cross-section disposed side by side and closed at their one and the same ends and mounted in a gas tight manner in the wall of the pipe. The two tubes are identical in shape and dimensions and each has four circular holes through its tube wall. All the holes are of the same shape and size, and each has a diameter in the range 0.4 mm to 1.00 mm. The internal diameter of each tube is at least 1.59 mm, and the ratio of the cross-sectional area of each tube to the cross-sectional area of each hole is at least 9:1. The positions of the holes in one tube are identical to the positions of the holes in the other tube except that the holes in the first tube face directly upstream with respect to the gas flow whilst the holes in the second tube face directly downstream. With respect to an imaginary plane P between the tubes, the first tube is symmetrical with the second tube. The speed of gas flow to be measured is preferably in the range of 0.3 to 10.00 m/s, and the gas is at or about atomspheric pressure.

REFERENCES:
patent: 1250238 (1917-12-01), Spitzglass
patent: 1508017 (1924-09-01), Greve
patent: 3425277 (1969-02-01), Adams
patent: 3559482 (1971-02-01), Baker et al.
patent: 3751982 (1973-08-01), Lambert
patent: 3803921 (1974-04-01), Dieterich
patent: 4343195 (1982-08-01), Victor et al.
patent: 4546655 (1985-10-01), Victor
patent: 4592239 (1986-06-01), Cutler
patent: 4624146 (1986-11-01), Nakagawa
Fluid Meters, Therir Theory and Application, 5th Edition, published by ASME, FIG. 30, p. 54.

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