Patent ID: 7748555
Filing Date: 2010-07-06
Classification: B65D

Abstract:
1. A secondary seal for a liquid storage tank that has a tank shell, a floating roof, and a primary seal that is connected to the floating roof and has shoe plates adjacent the tank shell, the secondary seal comprising: adapter plates that mount to and extend upwardly from upper sections of the shoe plates; a tip seal that is connected to upper parts of the adapter plates and is adapted to seal against the tank shell; a fabric barrier that is connected to the tip seal and is adapted for being disposed above the primary seal and connected to the floating roof; coil springs adapted for pressing against the adapter plates and one or more brackets fixed to the floating roof to exert sufficient force along the axes of the springs to the adapter plates to apply a force to the upper sections of the shoe plates and to maintain the tip seal in sealing engagement against the tank shell; and an electrical insulator at one end of one of the springs, beneath the fabric barrier.