Measuring method of cathodic protection potential and anode output current of closely spaced submarine pipeline without tail wire

Abstract

The invention relates to a close interval cathodic protection potential of a submarine pipeline without a tail wire and a measurement method of anodic output current, applied to measuring important technological parameters, such as the validity of anodic sacrifice protection and output current of an anode, matched with a submarine pipeline detection robot ROV. Equipment for measuring the cathodic protection potential of the submarine pipeline without the tail wire and the anodic output current is composed of a multifunctional probe, an underwater control system, two reference electrodes and the like, wherein the multifunctional probe comprises three measurement electrodes therein; the two reference electrodes are horizontally arranged on the ROV; due to use of an above-water computer system, the real protection potential of a submarine steel pipeline and the output current of a bracelet type sacrificial anode can be detected in a close interval manner; the validity of pipeline cathodic protection, evaluation of anode working states and prediction of anode residual lives can be realized; and in addition, due to the measurement method without the tail wire, in the event of detecting the submarine pipeline, the disadvantages, such as easy breakage of the tail wire, the limited length of the tail wire, great influence by sea conditions and influence of ship passage in a detected region, while dragging the tail wire connected with the pipeline body can be solved.

Description

technical field [0001] The invention relates to a method for detecting and realizing cathodic protection status of submarine pipelines, and belongs to the application technical field of corrosion detection and submarine pipeline detection. It integrates submarine pipeline detection, cathodic protection technology, pipeline potential measurement method, mathematical calculation method and other technologies. Background technique [0002] The ocean is a highly corrosive environment. Steel structures are prone to corrosion damage in the ocean environment. The corrosion of submarine oil and gas steel pipelines is much more serious than that of land-buried pipelines. Physical factors, chemical factors and biological factors in the marine environment will all lead to corrosion of pipelines, and once corrosion damage occurs, maintenance is extremely difficult, and the damage caused by medium leakage is very serious. Since the corrosion of submarine pipelines is a long-term develop...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the various inconveniences caused by the use of long-distance tail wires in the implementation of the CIPS method for potential measurement of submarine pipelines with close spacing.

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