Method and apparatus for detecting a blockage in a vapor flow li

Details Method and apparatus for detecting a blockage in a vapor flow li Method and apparatus for detecting a blockage in a vapor flow li

1977-01-19

1978-02-07

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

141 7, 141 59, 141 95, 141290, 364510, G08B 2100

Patent

active

040729346

ABSTRACT:
A method and apparatus for detecting blockages in one or more vapor flow lines such as vapor recovery lines used in liquid gasoline dispensing systems. The method and apparatus operate by sensing pressure in vapor flow lines and determining whether the frequency of the variations in the filtered rate of change with time of the pressure signal exceeds a preset limit indicating vapor bubbling through a liquid blockage. The method and apparatus also operate to determine whether the pressure signal exceeds a preset limit indicating a blockage condition.

REFERENCES:
patent: 3723987 (1973-03-01), Barone, Jr. et al.
patent: 3911975 (1975-10-01), VAN Soestbergen et al.
patent: 3955070 (1976-05-01), Suzuki et al.
patent: 3978462 (1976-08-01), Goodman
patent: 3983913 (1976-10-01), Bower
patent: 4014010 (1977-03-01), Jinotti

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