Contact type measuring device and method for sacrificial anode and cathode protection state of offshore submarine pipeline

Abstract

The invention relates to a contact type measuring device and method for the sacrificial anode and cathode protection state of an offshore submarine pipeline. The device comprises a detection rod and a data collector, the bottom end of the detection rod is in insulated connection with a measuring probe, and the top end of the detection rod is fixedly connected with a handle which can press the detection rod. A lower reference electrode and an upper reference electrode are arranged on the detection rod in an insulating manner, and are arranged up and down in a spaced manner, the ends of the lower reference electrode and the upper reference electrode are exposed, the measuring probe, the lower reference electrode and the upper reference electrode are respectively in circuit connection with the data collector, and the periphery of the upper part of the tip of the measuring probe is insulated by a thermal shrinkage sleeve. The measurement of the cathode protection potential and the sacrificial anode working potential of the submarine pipeline can be realized along the route direction of the offshore submarine pipeline, the protection current density of the submarine pipeline and the magnitude and the direction of the output current of a sacrificial anode are calculated according to the relationship between the potential gradient and the dielectric resistivity, and the position of the anode is judged according to the density, the magnitude and the direction, so that effectiveness evaluation on the sacrificial anode and a cathode protection system of the offshore submarine pipeline and prediction on the residual life of the anode are realized.

Description

technical field [0001] The invention relates to the technical field of marine pipeline anticorrosion, in particular to a contact measuring device and method for the sacrificial anode cathodic protection state of offshore submarine pipelines proposed for the special environment buried deep in offshore seabed sea mud and with low underwater visibility. Background technique [0002] Since submarine pipelines are easily affected by seawater or sea mud corrosion, a combined protection method of anti-corrosion coating and sacrificial anode cathodic protection is usually used. When the anticorrosion coating of the submarine pipeline is damaged and the pipe body fails, the sacrificial anode provides a cathodic protection current density to the pipe body where the anticorrosion coating is damaged through the seawater and sea mud medium around the submarine pipeline, so that the pipeline gets a certain cathode Protect. [0003] After the anti-corrosion coating and cathodic protection...

AI Technical Summary

Problems solved by technology

However, because the submarine pipeline is affected by the burial depth of sea mud and the protection of the anti-corrosion layer, the probes and electrodes for measuring potential are limited by the burial depth of sea mud and are far away from the pipeline. As a result, the probes and electrodes cannot be close to the pipeline, and the surrounding electric field is weak. , cannot accurately measure pipeline protection potential and potential gradient information

[0006] The offshore (shallow sea) seawater is turbid, the submarine pipeline route is buried deep in the sea mud, and the visibility of the submarine pipeline is almost zero. Destroy the environment where the pipeline is located, resulting in differences between the test results and the actual service status

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