Detecting leakage of fluid from a conduit

Details Detecting leakage of fluid from a conduit Detecting leakage of fluid from a conduit

1992-08-10

1994-10-11

Black, Thomas G.

Boots, shoes, and leggings

340605, 73 405R, G01M 328

Patent

active

053553241

ABSTRACT:
A method is provided to detect leakage from a conduit through which a stream of fluid flows and to indicate when there is a leakage condition or a no leakage condition. The method includes measuring at least one variable of a group consisting of fluid pressure and fluid flow rate over a period of time and at least one location of the stream to provide a data set representing the variable at the location and over the period of time. A statistical probability of obtaining the data set from the measurement under a first hypothesis that no leakage occurs is determined and a statistical probability of obtaining the data set from the measurement under a second hypothesis that leakage occurs is determined. One of the hypotheses is selected as being true if the probability of obtaining the data set from the measurement under the selected hypothesis is larger than the probability of obtaining the data set from the measurement under the other hypothesis. Should the second hypothesis be selected, a signal is initiated which provides an alarm to indicate that a leakage condition exists. Should the first hypothesis be selected a signal is initiated which indicates that a no leakage condition exists. In some embodiments of the invention, sequential probability ratio tests are used to determine the selected hypothesis.

REFERENCES:
patent: 4727748 (1988-03-01), Horigome et al.
patent: 4796466 (1989-10-01), Farmer
patent: 5272646 (1993-12-01), Farmer
U. Jedner et al., "Comparison of Methods for Detecting Leaks in Pipelines," 58, No. 11, Munchen, DE (Nov. 1991).
Wald, A. and J. Wolfowitz, "Optimum Character of the Sequential Probability Ratio Test", Annals of Mathematical Statistics, 19 (1948), pp. 327-339.
Wald, A. Sequential Analysis, Dover Publications, New York, New York, 1947, Chapter 3, "The Sequential Probability Ratio Test for Testing a Simple Hypothesis H.sub.0 Against a Single Alternative H.sub.1 ", pp. 37-57.

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