Method and apparatus for sealing high pressure tubes

Pipes and tubular conduits – With closures and plugs

Reexamination Certificate

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C138S090000, C029S890031

Reexamination Certificate

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07111645

ABSTRACT:
A plug for sealing high pressure tubes is made from a memory-shape alloy. The plug is formed having a diameter greater than the inner diameter of the tube and is shaped by cooling to its martensite finish temperature and bending its wings in opposing directions such that at a later time, it will fit within the tube. After insertion into the tube, the plug is heated to its austenite finish temperature, restoring its wings to almost their original shape, thereby exerting force onto the tube walls, sealing the tube from leakage.

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patent: 1966819 (1934-07-01), Irvin
patent: 2107259 (1938-02-01), Hazel
patent: 2256775 (1941-09-01), Hubbell
patent: 4462430 (1984-07-01), Anthony et al.
patent: 4976307 (1990-12-01), Hall et al.
patent: 5189789 (1993-03-01), Hall
patent: 5228476 (1993-07-01), Ashcroft
patent: 5558130 (1996-09-01), McCabe et al.
patent: 6244301 (2001-06-01), Scott et al.
patent: 6421916 (2002-07-01), Klahn et al.

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