Necessity of designing the lifetime of the cathodic protection system

In order to protect metal structures immersed in water or buried in soil against corrosion, it is necessary to use a suitable cathodic protection system. The cathodic protection system must be designed to provide the required current for each part of the structure for the required lifetime. This requires determining the size, weight, number and type of anode. Also, the design of longevity is based on each of the cathodic protection systems, taking into account the specific conditions of those systems.

Design based on impressed current system

The calculations for impressed current cathodic protection systems are relatively simple. Since the impressed current anodes are weight stable, in this case it is only necessary to match the number of anodes with a certain output current with the amount of current required by the whole structure. The anode distribution should be such that it leads to a uniform and balanced distribution of current.

Design based on sacrificial anode system

The calculations for the sacrificial anode system are a bit more complicated. The amount of sacrificial anodes required to protect metal structures is directly related to the surface subject to corrosion. The better the initial coating, the less anodes are needed. The arrangement of the anodes on the surface of the structure is adjusted to ensure a uniform distribution of current throughout the structure.

By sacrificing its weight, the sacrificial anode provides the protection current needed. Therefore, in a sacrificial anode system, the number of anodes must not only provide the current required by the structure, but must also have sufficient weight to provide current for the designed life of the structure. The size and shape of the anode is determined by the following factors:

• Minimum and maximum output current requirements.
• Installation and connection requirements.
• Anode weight requirements required.
• To be economical.

Sacrifice anode used in the tank

Maintenance of sacrificial anodes for fixed offshore structures is generally very costly and sometimes impractical. Therefore, using the optimal number and weight for the structure under protection is very important.

In this regard, you can use the sales unit of the cathodic system and you can also buy the products of Tavanazob Sana’ati Kavir Company from the relevant postal address.

The question is, why is the design of the cathodic protection system important to us?

We will answer this question in other educational articles of Tavanazob Sana’ati Kavir Company to learn more about the cathodic protection system.