The “Retractable Grounding Reel” (RGR for short) is designed todischarge the static electricity of floating roof storage tanks. It is used asthe equipotential bonding between the floating roof and tank shell. The lightningcurrent and bound charge will be effectively and rapidly dissipated to theearth upon a lightning strike. Compared with the conventional bypass conductor,it will effectively decrease the possibility of a lightning-induced fire, andmake it more reliable and safe.