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Corrosion monitoring system for outer wall of steel shell immersed tunnel
System composition
Sacrificial anode current monitoring system
Working principle
◆ Sacrificial anode leg is cut off and insulated;
◆ The protective current between the sacrificial anode and the steel shell is conducted through the wire, and the anode current transmitter is connected in series to the circuit;
◆ The anode current transmitter measures the protection current intensity, thus realizing the monitoring of the sacrificial anode release current;
◆ All current transmitters collect signals and transmit them to the CP monitor for data storage, transmission and analysis;
◆ Upload the data to the central control computer to evaluate the consumption rate and remaining life of sacrificial anode.
▎Technical indicators of sacrificial anode current monitoring system
▎Schematic diagram of sacrificial anode current monitoring system
Steel shell thickness detection system
Working principle
◆ The ultrasonic pulse generated by the ultrasonic sensor reaches the measured body through the coupling agent;
◆ When the ultrasonic pulse reaches the material interface through the measured object, part of the ultrasonic signal is reflected by the bottom of the object, and the thickness value is calculated by measuring the round-trip time of the ultrasonic in the material.
▎Technical indexes of steel shell thickness monitoring system
▎Schematic diagram of steel shell thickness monitoring system
Steel structure surface potential monitoring system
Working principle
◆ The reference electrode is arranged at different positions of the steel structure to monitor the surface potential at typical positions;
◆ The potential signal collected by each reference machine is transmitted to the CP monitor, and the data is stored, transmitted and analyzed;
◆ The potential data measured by the monitor is transmitted to the main control computer through RS485 communication bus;
◆ The computer processes the potential data of each monitoring point, displays the potential measurement curve, and saves the potential data in the database;
◆ Monitor the external surface protection potential of underwater structures and evaluate the corrosion protection status.
▎Technical indicators of composite reference electrode
▎Schematic diagram of steel shell surface potential monitoring system
Current density monitoring system for steel structure surface
Background
◆ With the aging of the protective coating, the insulation resistance value decreases, and the protection current density increases continuously. The protection current density increases gradually from the minimum value at the beginning.
◆ The cathodic protection status and coating damage of the steel shell can be judged by monitoring the current density on the surface of the steel shell.
▎Schematic diagram of current density monitoring system on steel shell surface
Working principle
◆ Install the monitored test piece outside the steel shell, and the material and coating of the device are consistent with the monitored steel shell;
◆ Monitor the current intensity released by the test piece into the seawater, and get the current density of the monitored cathode test piece according to "current density=measured current intensity/immersion area of the test piece".
▎Technical specifications of current density monitoring sensor on steel shell surface
Impedance monitoring system for steel shell surface coating
Structural style
◆ The coating impedance monitoring system is based on the electrochemical impedance spectroscopy (EIS), and adopts the traditional three-electrode system, namely, the working electrode, the counter electrode and the reference electrode.
Working principle
◆ The reference electrode is arranged at different positions of the steel shell to monitor the surface potential at typical positions;
◆ The potential signals collected by each reference electrode are transmitted to the CP monitor in a centralized manner, and the data are stored, transmitted, analyzed, etc;
◆ The potential data measured by the monitor is transmitted to the main control computer through RS485 communication bus;
◆ The computer processes the potential data of each monitoring point, displays the potential measurement curve, and saves the potential data in the database;
◆ Evaluate the corrosion protection status according to the external surface protection potential of the steel shell structure.
▎Technical specifications of coating impedance monitoring probe
▎Schematic Diagram of Impedance Monitoring System for Steel Shell Surface Coating
Software - corrosion protection monitoring and evaluation system based on multi-data fusion
Major function
♦ Real-time monitoring and display of steel shell potential, sacrificial anode current, residual life of sacrificial anode, coating impedance and status;
♦ Data acquisition, analysis, fault alarm, over/under protection alarm, probe leakage alarm and other highly automated;
♦ Query and analyze historical data and logs, and automatically generate formatted reports and reports;
♦ Realize the visualization of protection status and warn the possible under-protection and over-protection areas;
♦ Multi-terminal remote access, central control centralized control, onshore remote control, technical experts can provide remote diagnosis.
Address: Tangli Industrial Park, Hongqi Street, Ganjingzi District, Dalian
Tel：139-4097-0227
Email：wangmei@kingmile.com
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