Floating roof tank seal

A seal arrangement which, when installed, provides a sliding seal between a floating roof and the inner wall of a floating roof type tank, comprising:

• a resilient seal adapted to be arranged about the periphery of the floating roof, said seal having an expansible tube portion and a lip portion, the latter having a base part attached to the tube portion and a sealing part extending from the base part outwardly and downwardly therefrom with the sealing part being spaced from the tube portion so as to be flexed about the base part toward and away from the tube portion responsive to the floating roof moving toward and away from the inner wall with the sealing part remaining in sliding sealing engagement with the inner wall;
• arcuate clamp means adapted to be attached to the roof to extend along the periphery thereof to enclose the other three sides of the tube portion;
• means for supplying an inflating fluid to said tube portion to cause it, when installed inside said clamp on the roof, to expand said tube and cause said one side to move outwardly toward the wall of the tank to thereby move the sealing part of the lip portion into sealing engagement with such wall, the arrangement being such that when the sealing part is so moved, it is bent inwardly from its normal unstressed position so that the resiliency of the lip maintains it in contact with the tank wall.