Electrical grounding for tank floating cover

In an upright tank, a floating cover spaced inwardly from the side of the tank and movable therein in vertical, horizontal and circumferential directions, a flexible sealing ring encircling the cover and secured thereto, the outer edge of the sealing ring slidably engaging the tank side wall, a plurality of flexible cable loops disposed in substantially vertical planes around said cover between it and the tank side wall and spanning the space between them, said loops being spaced vertically from the sealing ring, and means securing one side of each loop to the side of the cover, the opposite side of each loop engaging the tank side wall, and the loops being compressed laterally between the cover and the side of the tank to maintain sliding electrical contact with said side wall as the cover moves in the tank in any of said directions.