Secondary seal for floating roof storage tank

A floating roof storage tank comprising an upstanding cylindrical tank shell for containing a quantity of liquid to be stored, a floating roof within said tank shell adapted to float on the surface of the liquid within said tank shell, first sealing means extending between said floating roof and said tank shell and closing the space therebetween to provide a primary seal therebetween, an annular second sealing means secured to said floating roof and extending radially outwardly therefrom and lying in sealing engagement with the inner surface of said tank shell, said second sealing means including a plurality of arcuate sections with adjacent ones thereof having the free radial edges thereof abutting, bridging means including radially spaced-apart strips bridging said abutting radially extending edges and maintaining same in abutting relationship and fasteners extending through said strips and said adjacent arcuate sections for sealingly interconnecting same to form an annular secondary seal between said floating roof and said tank shell, and a sealant providing a gas tight seal between said annular secondary seal and said floating roof.

A floating roof storage tank comprising an upstanding cylindrical tank shell for containing a quantity of liquid to be stored, a floating roof within said tank shell adapted to float on the surface of the liquid within said tank shell, first sealing means extending between said floating roof and said tank shell and closing the space therebetween to provide a primary seal therebetween, an annular second sealing means secured to said floating roof and extending radially outwardly therefrom and lying in sealing engagement with the inner surface of said tank shell, said second sealing means including a plurality of arcuate sections, a fixture having oppositely extending slots dimensioned to receive the free radially extending edges of adjacent sections for sealingly interconnecting adjacent arcuate sections to form an annular secondary seal between said floating roof and said tank shell, said fixture having plate means overlying adjacent sections and means maintaining said fixture and said sections and said plate means in fixed relation, and a sealant providing a gas tight seal between said annular secondary seal and said floating roof.

A floating roof storage tank comprising an upstanding cylindrical tank shell for containing a quantity of liquid to be stored, a floating roof within said tank shell adapted to float on the surface of the liquid within said tank shell, first sealing means extending between said floating roof and said tank shell and closing the space therebetween to provide a primary seal therebetween, a second sealing member secured to said floating roof extending therebeyond and lying in sealing engagement with the inner surface of said tank shell to form a secondary seal between said floating roof and said tank shell, fusible means in said second sealing member permitting access to the annular space between said primary seal and said secondary seal, and a sealant providing a gas tight seal between said flexible secondary seal means and said floating roof.