Method and apparatus for positioning optical fibers in a buried

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...

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138 94, 405184, F16L 102

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active

046487441

ABSTRACT:
A method and apparatus for installing optical fibers on a leader in plastic pipe are disclosed. In the preferred and illustrated embodiment for one type of plastic pipe having transverse corrugations, a pig is set forth which has a eyelet for connection with a towed leader, the eyelet being anchored at the nose. The pig body is constructed so that the nose is deformed as loading increases with length of leader, thereby swelling. This reduces blow-by and increases thrust force acting on the pig to overcome the increase in drag with leader length. An alternate embodiment shows an outer layer incorporating graphite or Teflon.RTM. particles in the outer layer to reduce friction. The pigs of this disclosure are adapted to be used in procedures involving corrugated plastic pipe and also plastic pipe having a smooth wall and spaced welded internal beads.

REFERENCES:
patent: 4011100 (1977-03-01), Ross
patent: 4309128 (1982-01-01), Williams
patent: 4432663 (1984-02-01), Lasak et al.
patent: 4460159 (1984-07-01), Charlebois et al.
patent: 4509222 (1985-04-01), Knapp

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