Detection of natural gas within a customer's domain

Details Detection of natural gas within a customer's domain Detection of natural gas within a customer's domain

1993-11-19

1995-08-01

Chilcot, Jr., Richard E.

Measuring and testing

With fluid pressure

Leakage

73780, G01L 2700

Patent

active

054371805

ABSTRACT:
Temperature of the gas stream entering the end user's internal piping system has been found to be fairly stable (at about 50 degree F.) but still variable while the temperature of the end user's internal piping system (irrespective of total length) has been found to vary as a function of the ambient temperature exterior of the end user's internal piping system. Each of such temperatures can be used in association with a differential pressure leakage detection system that uses a piezoresistive pressure sensor which measures differential pressures between the natural gas and ambient air both entering the sensor to provide a pair of output signals with the difference between these signals being related to the occurrence of small leakage of natural gas within the internal piping network of the end-user, such flow being normalized so that any such flow is due only to leakage.

REFERENCES:
patent: 4604899 (1986-08-01), Yamada et al.
patent: 4656871 (1987-04-01), Czarnoski
patent: 4667516 (1987-05-01), Shulz
patent: 4798093 (1989-01-01), Kenoun
patent: 5050423 (1991-09-01), Czarnoski
patent: 5193399 (1993-03-01), Czarnoski

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