Lightning protection system for external floating roof tank

A system comprising:

• a storage tank having an inner side wall surface;
• a floating roof having a rim, the floating roof disposed within the storage tank and separated from the inner side wall surface by an annular gap;
• a shoe seal disposed inside the storage tank in sealing contact with the inner side wall surface;
• a primary seal extending between the rim and the shoe seal, the primary seal having a first end proximate to the shoe seal and a second end proximate to the rim;
• a secondary seal extending over the primary seal, the secondary seal having a first end in sealing contact with the inner side wall surface and a second end proximate to the rim;
• a plurality of shunts extending over the primary seal and under the secondary seal, the plurality of shunts distributed along a perimeter of the floating roof, the plurality of shunts having first ends proximate to the shoe seal and second ends proximate to the rim;
• a plurality of first connections attaching the first end of the primary seal and the first ends of the plurality of shunts to the shoe seal;
• and
• a plurality of second connections attaching the second end of the primary seal, the second end of the secondary seal, and the second ends of the plurality of shunts to the rim.