Anticorrosion measures for cathodic protection construction of oil storage tank

Nowadays, the use of oil storage tank is more and more widely, and the cathodic protection of oil tank is becoming more and more important. When cathodic protection is applied to the bottom plate of oil tank, the cathodic protection system and test device shall be carried out at the same time. Therefore, the test regulations of oil tank shall be carried out at the same time: the long-term reference electrode shall be buried under the bottom plate of the oil tank, the reference electrode required in the center of the bottom plate shall be the reference electrode with long-term copper sulfate or high-purity zinc; the cable used for testing shall be of good quality and strength When measuring the protection point of tank bottom plate, plastic pipe with hole can be installed under the bottom plate.


The cathodic protection of the outer wall of tank bottom plate must be done, and the appropriate cathodic protection mode should be selected according to the difference of environment and equipment size. For large storage tanks, especially when the soil resistivity is relatively high, the best cathodic protection method is impressed current cathodic protection; while for small storage tanks, combined with low soil resistivity in the surrounding environment, the most suitable cathodic protection method should be sacrificial anode cathodic protection. The cathodic protection current should be calculated before choosing the cathodic protection mode. In this respect, it is necessary to consider that the grounding system of cathodic protection will cause the loss of cathodic protection current.


Before, when the construction personnel do the tank foundation work, they usually lay a layer of asphalt sand, which is not recommended in practice, because it will hinder the current from the cathodic protection system to the tank bottom plate and affect the effect of the cathodic protection system.


Therefore, most of the tanks now use a layer of primer on the outside of the tank bottom plate. There are many people will think that the primer is easy to damage when welding and have some worry, in fact, this is very normal. Although the primer is easy to be damaged, the damage is only a small part of it, most of which can be well preserved, which will effectively reduce the current demand of cathodic protection system, and the current distribution will be very uniform.


Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing cathodic protection technology, engineering design, installation and technical services.