Abstract: A contrastive analysis of API RP 545 and the simulation lightning experiment with floating roof storage tanks by the Institute of Safety Engineering lead to the conclusion that the design of the experiment with floating roof tanks by the Institute of Safety Engineering is more suitable for the actual operation. Based on the experimental results, it advances the proposal that the shunts on the second seal should be removed, and that multiple retractable grounding fitting between the roof and tank wall should be used to replace the shunts. The design is found to be feasible, easier to implement and maintain, and more secure and reliable .