Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1988-06-02
1990-04-17
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
137318, 405303, F16L 100
Patent
active
049175394
ABSTRACT:
A cable entry or exit pipe is formed on a fluid transportation pipeline while in normal operation full of and transporting a fluid under a positive pressure, by a method which comprises the steps: (a) producing two semi-cylindrical shells, one of which carries an oblique branch pipe and has an aperture aligned with the bore of the branch pipe; (b) securing in a fluid tight manner around the pipeline the two shells so as to form a reinforcing collar carrying an oblique branch pipe lying at an acute angle suitable for the entry into and exit from the pipeline of a cable; (c) securing in a fluid tight manner to the free end of the branch pipe an isolating valve; (d) securing in a fluid tight manner to the free side of the isolating valve a fluid tight drilling apparatus equipped with a drilling bit; (e) opening the valve and introducing the drill bit through the opened valve into the branch pipe; (f) rotating and progressively advancing the drill bit into contact with and through the wall of the pipeline section; (g) withdrawing the drill bit and closing the valve; and (h) removing the drilling apparatus. Preferably, a liner inserted into the branch pipe between steps (g) and (h) serves as a cable guide.
REFERENCES:
patent: 997464 (1911-07-01), Metcalf
patent: 2608989 (1952-09-01), McDonald
patent: 3272211 (1966-09-01), Leopold et al.
patent: 3703909 (1972-11-01), Erb
patent: 4067353 (1978-01-01), DeHoff
patent: 4411459 (1983-10-01), Ver Nooy
patent: 4423311 (1983-12-01), Varney
patent: 4532953 (1985-08-01), Rysewyk
patent: 4649948 (1987-03-01), Hudson
Saunders & Dolleymore
Taylor Dennis L.
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