System for detecting leakage faults in a pipeline by measuring t

Details System for detecting leakage faults in a pipeline by measuring t System for detecting leakage faults in a pipeline by measuring t

1977-01-18

1978-06-13

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

174 11R, 324 61R, 340242, G01R 3108, G01R 2726, G01M 304

Patent

active

040951740

ABSTRACT:
This invention relates to an arrangement for detecting the leakage fault of a pipeline by means of a sensing coaxial cable buried in parallel with the pipeline and divided into sections. When an oily substance such as petroleum leaks upon a portion of the sensing cable, the electric characteristics such as the impedance, or the distributed capacity of the cable will change. This change in the distributed capacity is used to detect a small variation in the cable caused by a small leakage of the oily substance, resulting in detecting the fault in the pipeline.

REFERENCES:
patent: 2476317 (1949-07-01), Nelson et al.
patent: 2490377 (1949-12-01), MacLean
patent: 2611805 (1952-09-01), Osborn et al.
patent: 3159786 (1964-12-01), Bayne
patent: 3234459 (1966-02-01), Brazee
patent: 3452272 (1969-06-01), Collins et al.
patent: 3600674 (1971-08-01), Roberts
patent: 3766469 (1973-10-01), Nakane
patent: 4029889 (1977-06-01), Mizuochi

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