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Current status of lightning protection for large External Floating Roof Oil Tanks

time2021/03/12

Current status of lightning protection for large External Floating Roof Oil Tanks
Current status of lightning protection for large External Floating Roof Oil Tanks

Through the investigation and study of lightning protection measures for more than 200 50,000-150,000 m3 external floating roof storage tanks. The results of the investigation are as follows: 

(1) There are two types of external floating roof oil tank sealing, namely mechanical seal and soft seal (bladder seal);

(2) The conductive sheet of the floating plate of the outer floating roof oil tank is mostly "coated";

(3) The secondary sealing of the outer floating roof oil tank is not tight;

(4) The concentration of combustible gas in the secondary sealed cavity of the outer floating roof oil tank can reach the explosive limit concentration;

(5) The metal components in the primary sealed cavity of the outer floating roof oil tank are not equipotentially connected;

(6) The secondary sealing metal sealing baffle of the outer floating roof oil tank has no equipotential connection;

The connection form of the two grounding wires on the floating plate of the outer floating roof oil tank is incorrect:

(8) The floating plate escalator of the outer floating roof oil tank has no equipotential connection with the floating plate and the tank wall;

(9) The resistance value between some conductive sheets and the floating plate does not meet the requirements, and some resistance values ​​tend to "o0";

(10)The resistance values ​​of most conductive sheets and the tank wall do not meet the requirements, and most of the resistance values ​​tend to " o";

(11) There is no high and medium frequency lightning current shunt facility for the floating plate of the outer floating roof oil tank;

(12) There is no medium and low frequency lightning current shunt facility for the floating plate of the outer floating roof oil tank;

(13) The breathing valve on the floating plate is not bridged;

(14) The forced breathing valve on the floating plate is not bridged;

(15) High-tower lightning rods and overhead lights are set up around the oil tank.