Measuring and testing – Gas analysis – Gas chromatography
Patent
1977-10-27
1979-08-14
Myracle, Jerry W.
Measuring and testing
Gas analysis
Gas chromatography
73 405R, G01N 3100
Patent
active
041641388
ABSTRACT:
A gas leak detection system is provided which includes a large number of small diameter flexible tubes which are mounted in alignment and which extend down close to the surface of the earth or the street where the gas leak is to be detected. The total internal volume of the system is kept to a minimum by using very small diameter tubes and minimizing the volume included in the system. Preferably the total volume in the system is less than 100 cubic centimeters. This provides for a response time of three seconds or less with the small portable ionization type gas detectors which are commercially available. Manifold arrangements are provided which give equal length trasmission paths from all of the sampling tubes. A counterweighted boom is employed to sense leaks beyond the curb adjacent the street where the vehicle is travelling. The manifold may be made of an elongated member of plastic, aluminum, or the like, with the gas passages being in the form of grooves in the surface of the elongated member, which are subsequently transformed into gas passageways by the addition of a cover sheet. The depending flexible tubes may be made of Teflon, and preferably have their ends cut off at an acute angle so that water droplets will not block the central gas passageway.
REFERENCES:
patent: 2879663 (1959-03-01), Thomas
patent: 3333458 (1967-08-01), Heath et al.
patent: 3420091 (1969-01-01), Franklin
patent: 3444721 (1969-05-01), Hearn et al.
Myracle Jerry W.
Smith & Denison
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