Method for continuously monitoring the soundness of the protecti

Details Method for continuously monitoring the soundness of the protecti Method for continuously monitoring the soundness of the protecti

1993-05-20

1994-07-19

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324 711, G01R 2702, G01N 2700

Patent

active

053312864

ABSTRACT:
A method for monitoring the soundness of the protective covering on underground metal structures subjected to cathodic protection, based on the electrical resistance offered by said covering, and consisting of modulating the imposed cathodic protection current and measuring the corresponding variation in potential due to the ohmic drop, said resistance being obtained from the ratio of the variation in potential to the modulation current.

REFERENCES:
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patent: 4591792 (1986-05-01), Birchmeier et al.
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patent: 4940944 (1990-07-01), Steele et al.
Kasahara et al, An Improved Method for Measuring Pipe-to-Soil Potential and Current Density at Cathodically Protected Pipelines, Materials Performance vol. 18 No. 3 (Mar. 1973), pp. 21-25.
Rickert et al, Elektrochemische Untersuchungen zum kathodischen Korrosionsschutz mit Unterbrecherpotentiostaten, Werkstoppe & Korrosion Nov. 11 (1987) pp. 691-695.

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