Cathodic protection of crude oil dehydration tank

The liquid in the dehydration tank is divided into three layers: water, emulsion and oil. The water layer has high salt content and dissolves organic acid, carbon dioxide and hydrogen sulfide, which has strong corrosivity, so cathodic protection should be adopted. When the salt content is low and the temperature is lower than 30 ℃, magnesium anode or high activation aluminum anode can be used.

In most cases, the impressed current cathodic protection method is the most economical. All kinds of auxiliary anodes can be used, but the anode and its accessories should be able to withstand the corrosion of oil. It should be noted that oil products and gas generated by protection will be flammable and explosive, and sparks are strictly prohibited.

Next, we will talk about the installation of sacrificial anode cathodic protection for crude oil dehydration tank.

The sacrificial anode can be directly welded to the steel plate at the bottom of the tank or fixed on the steel bracket by bolts. No matter what method is adopted, it should ensure that the anode and steel plate are well connected, and there should be a certain range of insulation shielding layer under the anode. The auxiliary anode system can be installed by suspension or fixed by bracket, which is evenly distributed in the tank.

The installation of auxiliary anode should pay attention to several problems

1、 The anode and tank must be well insulated, and the insulation screen must be used under the anode;

2、 The anode position should be in the water layer, and the anode circuit should not be empty when the liquid level drops;

3、 All anode wiring must be well sealed. All cable sheaths shall be oil resistant and shall not be armored.

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. 

Tel: +86 17568010262，0539-3712117.