Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1988-06-02
1989-08-15
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
2541344, B65H 5900, F16L 100
Patent
active
048569372
ABSTRACT:
A method of deploying a cable or other line in a fluid transportation pipeline while in normal operation full of and transporting a fluid under a positive pressure. A collapsible centralizing device is attached to the leading end of the cable and is then fed in a collapsed state into the pipeline via a first fluid sealing means at the cable entry position. That device maintains the cable end centralized in the pipeline cross section while the cable is fed into the pipeline. Magnetic sensing means disposed near the cable exit position sense the presence of the cable end and control the cable infeed so as to position the cable end in a predetermined cable retrieval position. A tubular lance is fed into the pipeline through a second fluid sealing means disposed at the cable exit position, and a grab housed in the nozzle of the lance is ejected to engage and capture part of the centralizing device and cable end, whereafter the grab closes on being drawn back into the lance. The lance is then withdrawn through the second fluid sealing means so as to draw with it the grab and the captured centralizing device and cable end.
REFERENCES:
patent: 920455 (1909-05-01), Greenan
patent: 1658887 (1928-02-01), Dotzauer
patent: 2930584 (1960-03-01), Hensley et al.
patent: 3034766 (1962-05-01), Hamrick
patent: 4756510 (1988-07-01), Klamm et al.
Baskett Ralph E. J.
Grocott Geoffrey J.
British Pipeline Agency Limited and STC PLC
Taylor Dennis L.
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