Apparatus, systems and methods for plugging a high...

Fluid handling – Processes – Cleaning – repairing – or assembling

Reexamination Certificate

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Details

C137S317000, C137S318000, C138S094000, C138S097000

Reexamination Certificate

active

10554134

ABSTRACT:
A method of plugging a pipeline includes the steps of welding onto the exterior of the pipeline (10) first (12) and second (14) spaced apart collars, each having a sealing face (26,26A) in a plane perpendicular the pipeline (10) axis. A containment housing (34,36) is affixed by welding to the collars (12,14) to fully encompass a section of the pipeline (10) between the collars (12,14). A tapping (60) machine is then removably attached to an open top of the containment housing (34). Using the tapping machine (60) a short length of the pipeline (10) is cut and removed from between the collars (12,14) leaving two open exposed pipe ends (78,80). First and second seal elements (92,94) are positioned between the collars (12,14), Each having a forward sealing face. The seal elements (92,94) are forced apart from each other into sealing engagement with the collar sealing faces thereby closing the open, exposed ends (78,80) of the pipe (10).

REFERENCES:
patent: 3170226 (1965-02-01), Allan
patent: 3785041 (1974-01-01), Smith
patent: 5690139 (1997-11-01), Murphy et al.
patent: 6745791 (2004-06-01), Beals et al.
patent: 0069551 (1983-01-01), None
patent: 1064398 (1967-04-01), None
Intl Search Rep, Jul. 23, 2004.
Written Opinion, Jul. 23, 2004.
Search Report, Oct. 10, 2006, Singapore Patent.
Exam Report, Nov. 27, 2006, European Patent.

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