Flat cathodic protection test probe

Details Flat cathodic protection test probe Flat cathodic protection test probe

1998-03-02

2000-05-09

Do, Diep N.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

20419606, G01N 2742

Patent

active

060608773

ABSTRACT:
A flat cathodic protection test probe comprises a non-metallic probe body (20) with a mounted metal coupon (18) simulating a large coating holiday on a pipeline, an insulated wire(s) (22) attached to the coupon for an electrical connection to the pipeline, a non-metallic tube (16) filled with a conductive backfill (26), and a narrow and long porous potential sensing strip(s) (40) mounted flush with the coupon exposed surface in the central area of the coupon. The coupon is electrically insulated from the conductive backfill by a non-metallic coating (38) and an epoxy compound for electrical insulation (42). To determine if the pipeline is fully cathodically protected, the flat cathodic protection probe is buried next to the pipeline and interconnected by the insulated wire(s) with the pipeline. The potentials taken on the probe will not include a substantial voltage drop in soil and will not be adversely affected by shielding of the coupon by a reference electrode or its access tube to invalidate the reading. To measure the probe potential, a calibrated reference electrode (24) is lowered into the tube to make an electrical contact with the conductive backfill and a high impedance voltmeter (36) is connected to the coupon and to the reference electrode. No interruption of the cathodic protection to the pipeline or coupon is necessary.

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