Secondary seal for floating roof storage tank
AssigneeChicago Bridge & Iron Company
InventorTerry A. Gallagher
Life of this patent
Estimating the term…
Abstract
A low profile secondary seal has a tube positioned above a primary seal that utilizes a shoe plate. The tube is connected to the floating roof. A tip seal adjacent the shell of the tank is connected to the shoe plate by a spacer. In use, the tube bears on the spacer with sufficient force to maintain the tip seal in sealing engagement against the shell of the tank.
Claims20
A secondary seal for a liquid storage tank having a floating roof and a primary seal connected to the floating roof and to a shoe plate adjacent a shell of the tank, the secondary seal comprising:
- a tip seal adjacent the shell of the tank;
- a spacer connecting the tip seal to the shoe plate;
- and
- a tube above the primary seal, connected to the floating roof and bearing on the spacer with sufficient force to maintain the tip seal in sealing engagement against the shell of the tank.
A liquid storage tank comprising:
- a tank shell;
- a floating roof within the shell;
- a shoe plate adjacent the shell;
- a primary seal connected to the floating roof and to the shoe plate;
- and
- a secondary seal comprising:
- a tip seal adjacent the shell;
- a spacer connecting the tip seal to the shoe plate;
- and
- a tube above the primary seal, connected to the floating roof and bearing on the spacer with sufficient force to maintain the tip seal in sealing engagement against the shell of the tank.
A method for installing a secondary seal in a liquid storage tank having a floating roof and a primary seal connected to the floating roof and to a shoe plate adjacent a shell of the tank, the method comprising:
- installing a spacer connecting a tip seal to the shoe plate, the tip seal adjacent the shell of the tank;
- installing a tube above the primary seal;
- and
- connecting the tube to the floating roof and causing the tube seal to bear on the spacer with sufficient force to maintain the tip seal in sealing engagement against the shell of the tank.
Dependencies are inferred from the claim text.