Pipe threading arrangement

Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – By fluid pressure differential in conduit

Reexamination Certificate

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Details

C254S13430R, C254S13430R

Reexamination Certificate

active

06296231

ABSTRACT:

The invention relates to the threading of a pipe between two locations, the pipe typically carrying a fluid.
In gas pipes, for example, it may be necessary to allow an object to be towed between one location and another in a ‘live’ fluid carrying condition. Such a situation is described in copending patent application GB 9724231.7.
The present invention is concerned with a mechanism for allowing an initial lightweight thread or cable to be passed between the locations prior to towing the object between the two points.
According to the invention there is provided pipe threading apparatus including means for launching a parachute-like device from a first location through the pipe to a second location under fluid pressure and stopping means for positioning at the second location for stopping the further passage of the parachute-like device, the parachute-like device being configured to carry a cable so as to provide a connection between the first and second locations.
The stopping means preferably has an adherent surface for cooperating with an adherent surface carried by the parachute-like device.
Preferably the stopping means is moveable perpendicular to the axis of the pipe to automatically halt the parachute-like device on contact with the stopping means.
Further according to the invention there is provided a method of threading a pipe between first and second locations comprising providing an aperture in the pipe at first and second spaced locations, providing a stopping device within the pipe at the second location, launching a parachute-like device carrying a threading cable from the first location allowing the parachute to move to the second location by means of fluid flow through the pipe until stopped by the stopping device and retrieving the parachute-like device with the attached cable to provide pipe threading between the first and second locations.
Preferably the method includes providing sealable chambers at the first and second locations to allow the device to be launched and retrieved and the step of adjusting the pressure within the sealable chamber to facilitate the launch and retrieval.


REFERENCES:
patent: 5121644 (1992-06-01), Grey et al.
patent: 5156376 (1992-10-01), Spicer
patent: 5246207 (1993-09-01), Horii et al.
patent: 5395091 (1995-03-01), Craddock
patent: 5906357 (1999-05-01), Munson, Sr.
patent: 31 40 928 (1983-05-01), None
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patent: 0 442 626 (1991-08-01), None
patent: 0 736 722 (1996-10-01), None
patent: 2 228 777 (1990-09-01), None
patent: 2 312 995 (1997-11-01), None
patent: 4140007 (1992-05-01), None

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