Transit for cables and pipes

A lead-through transit for cables or pipes comprising:

• a rigid outer frame defining a rectangular opening having opposed frame side walls and opposed frame end walls,
• a plurality of modular blocks of resilient material arranged in rows within said opening,
• said rows extending between said frame side walls and partially filling said opening between said frame end walls,
• each said block being of rectangular section extending through said opening, said blocks comprising cable blocks which surround a respective cable or blanking blocks which blank off a modular space,
• said cable blocks comprising two complementary half-blocks defining a lead-through passageway extending normal to the plane of said opening, through which passageway the cable extends between entry and exit ends of said passageway,
• a compression means located between said frame side walls and completing filling of said opening between said frame end walls to compress and seal said blocks relative to one another and to said frame, and to compress and seal each cable block onto and around its respective cable,
• wherein each said cable block comprises:
• a plurality of axially spaced apart internal annular recesses, said recesses being spaced from said entry and exit ends of said passageway,
• a series of axially spaced apart internal land portions separated by said recesses, each said land portion having an axially extending sealing face and axially spaced opposed land side walls, the side walls, in the uncompressed state, extending generally radially from the bottoms of the recesses up to the sealing faces, and the sealing faces in the uncompressed state being cylindrical surfaces which extend axially for a distance greater than the height of their respective side walls, such that the land portions, viewed in an axial cross sectional plane are generally rectangular, each sealing face engaging a discrete outer surface of said cable, which discrete cable outer portions are spaced apart axially, by said recesses, from the other discrete outer cable surfaces which are engaged by other land portions, each said land portion engaging said cable around the entire circumference of its said discrete surface,
• the land portions being of a resilience, which, upon compression onto and around its respective cable, deforms into its adjacent recesses to form a high pressure fluid tight seal between itself and the cable (1) within a finite range of cable diameters received within that passageway and (2) in the presence of certain common irregularities in the nominal diameter of the cable.