Importance

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Abstract

A seal unit is provided for forming a seal between a pipe extending axially through a cylindrical hole, where said pipe is positioned eccentrically in said hole. The seal unit comprises a plurality of resilient compressible elastomer seal blocks, each block having a fixed height, a thickness and a width. The blocks are connectible to each other to form a ring, with a thickness of each block being arranged in a radial direction relative to the ring. A thickness of the blocks varies from block to block, with a smallest thickness block being arranged diametrically across from a largest thickness block in the ring. Intermediate blocks between the smallest thickness block and the largest thickness block have progressively increasing thicknesses leading from the smallest thickness block to the largest thickness block in each circumferential direction. The blocks can be compressed in an axial direction to cause them to expand in radial and circumferential directions, effecting a seal between the pipe and the hole.

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First Claim