Cathodic protection methods three systems

Insulation of such a large number of departments is not only costly but also costly to maintain later, so the system is often ineffective. Increased the difficulty of handling and cost.

Therefore, the network anode cathodic protection is the most reliable way at present. In this way, there is no need to use the anticorrosive layer on the outside of the tank bottom plate, which will save a lot of money. The system must not be bent too much. Easy to produce erosion interference. Other systems include pipe networks, instrument connections, cable bushing, concrete reinforcement, and tank group grounding systems.

The anode is made of conductive rubber coated on the outside of the cable, and the rubber is wrapped with a layer of carbon powder packing. The system can be laid under the bottom plate of the storage tank. The current distribution is average, and it is not easy to produce erosion interference, but it has the following disadvantages:

Three, flexible anode system

The system is mainly used in the built storage tank, especially in the area with small space. Its disadvantage is that the cathodic protection current is uneven and some areas cannot be protected.

3, because conductive rubber is under the action of current, with the passage of time easy aging cracking, leading to the rapid erosion of copper core cable, resulting in premature failure of the system.

4, the site needs a lot of cable connection, quality is difficult to ensure.

Sacrificial anode system

Cathodic protection methods three systems

1. The transportation and installation of the system are higher than that of the network anode system, and each plate anode is very heavy.

2, the packing belt is easily destroyed, resulting in the loss of packing, need to fill in the future. Anode is in below very bad working premise, easy and premature damage.

Two, deep well anode system

The driving voltage of sacrificial anode system is generally less than 0.7V, which limits the current output of cathodic protection system. Therefore, it is economical and fair to apply cathodic protection to the storage tank.

The tank is protected by a sacrific anode system that is simple to install and does not cause erosion interference, but will not be adequately protected unless the tank is well insulated from piping and other systems. Once the tank is short-circuited with any of the above departments, not only will the tank reach the protection problem, but also the sacrificial anode system will be exhausted quickly and the protection life will be short. If only anticorrosive layer is used without cathodic protection, because the coating at the weld will be destroyed, forming a large cathode and a small anode, which will accelerate the erosion and perforation speed of the storage tank.