Duct leakage control

Pipes and tubular conduits – Repairing – Patches

Reexamination Certificate

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Details

C138S099000

Reexamination Certificate

active

08061389

ABSTRACT:
The invention relates to the control of leakage from ducts, such as fluid-carrying pipework, without necessarily requiring direct access to the leakage site itself; since leakage sites are often difficult to locate with the necessary degree of precision to permit access to reliably be made thereto, and moreover, even if a site can be located, it is not always convenient or economically possible to secure access thereto. The invention provides an apparatus and methods for duct leakage control wherein a sealing element (1) is introduced into the duct and is automatically drawn or otherwise guided to the locality of a leak; the element being caused, by reason of a pressure differential attributable to the leak, to move into and stem or seal the leak. The sealing element may comprise a plurality of individual members of differing buoyancy, each capable of being carried along at a predetermined level in the duct by the flow of fluid therein. The sealing element may carry a tagging device which can be used to assist in locating the leakage site.

REFERENCES:
patent: 3144049 (1964-08-01), Ginsburgh
patent: 3298399 (1967-01-01), Slade
patent: 3837214 (1974-09-01), Guest
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patent: 4402213 (1983-09-01), Hogan
patent: 4582091 (1986-04-01), Ells
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patent: 5680885 (1997-10-01), Catallo
patent: 6161588 (2000-12-01), Bellamy et al.
patent: 6206049 (2001-03-01), Ward
patent: 6615875 (2003-09-01), Adolphs et al.
patent: 6931952 (2005-08-01), Rantala et al.
patent: 0 303 048 (1989-05-01), None
patent: 1 101 870 (1968-01-01), None
patent: 2 334 532 (1999-08-01), None
patent: 2 400 898 (2004-10-01), None
Merriam-Webster's Collegiate Dictionary, Tenth Edition, pp. 660, 724 and 1079.

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