A long-term polarization probe for pipeline cathodic protection

Abstract

The invention provides a long-acting polarization probe with pipeline cathodic protection. The long-acting polarization probe is characterized in that an inner cavity (2) is sleeved at the inner lower middle part of an outer cavity (1) and extends out of the outer cavity (1); an ion-conductive polymer (3) is fixed in the center of the bottom of the inner cavity (2); an inner cover (8) is arranged on the inner cavity (2), and an outer cover (7) is arranged on the outer cavity (1); a self-corrosion test block (5) is fixed outside the outer cover (7), and the outer cover (7) is in fit sealing with the outer cover (1) through threads and a gasket; a polarization test block (4) and the inner cover (8) are in fit sealing with the inner cavity (2); a copper bar (9) is inserted into the inner cavity (2) from the top and sealed on the inner cover (8); a cable (6) enters the upper part of the outer cavity (1) through the outer cover (7); saturated copper-bath (13) is filled in the inner cavity (2). By adopting the long-acting polarization probe with the pipeline cathodic protection, the permeation and dropping of a reference electrode solution can be avoided, the blocking of a semipermeable membrane can be avoided, and an electrode can be prevented from corrosion; the service life of the long-acting polarization probe is long; the polarization test block can be tightly contacted with the soil.

Description

technical field [0001] The invention is a long-term polarization probe for pipeline cathodic protection. It relates to the technical field of piping systems. Background technique [0002] At present, most oil and gas pipeline cathodic protection polarization probes use microporous ceramic semi-permeable membranes for the conduction of the electrolyte inside and outside the reference electrode. Because the solvent is allowed to pass through under the action of osmosis for a period of time, it will inevitably lead to the leakage of the reference electrode solution or even The clogging of the semi-permeable membrane, the contamination and the oxidation of the electrode eventually lead to failure. Although the use of a large-volume double-chamber structure and special fillers can alleviate this problem and prolong the service life of the polarization probe, it cannot fundamentally solve this problem. In addition, the polarized test piece of most polarized probes is located on t...

AI Technical Summary

Problems solved by technology

[0002] At present, most oil and gas pipeline cathodic protection polarization probes use microporous ceramic semi-permeable membranes for the conduction of the electrolyte inside and outside the reference electrode. Because the solvent is allowed to pass through under the action of osmosis for a period of time, it will inevitably lead to the leakage of the reference electrode solution or even Blockage of the semi-permeable membrane, contamination and oxidation of the electrode and eventually failure, although the use of a large-volume double-chamber structure and special fillers can alleviate this problem and prolong the service life of the polarization probe, but it cannot fundamentally solve this problem

In addition, the polarized test piece of most polarized probes is located on the lower surface of the probe, and it is impossible to ensure that the entire area of ​​the polarized test piece is in close contact with the soil after backfilling

[0003] CN201319014Y discloses a polarization test probe, "Gas and Heat" Volume 30, Issue 4 discloses an "Application of Polarization Probes in Cathodic Protection of Buried Steel Pipelines", and CN2915885Y discloses a buried type copper / copper sulphate reference electrode, but none of them have ideal lifetime

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