Pipe joints or couplings – Packed – Flanged pipe
Reexamination Certificate
2011-07-12
2011-07-12
Hewitt, James M (Department: 3679)
Pipe joints or couplings
Packed
Flanged pipe
C285S110000, C285S364000, C285S910000
Reexamination Certificate
active
07976074
ABSTRACT:
Sealing systems for high pressure applications that provide electrical isolation between joined elements as well as enhanced resistance to leakage of media during a fire. High pressure sealing is accomplished using a metallic core to which an electrically isolating material is bonded on either or both sides. Sealing is achieved through a dielectric sealing element, such as a spring-loaded polytetrafluoroethylene (PTFE) ring. Flanges of the joint may be bolted together with the seal interposed therebetween, and the flanges bolted together. In the event of a fire, heat may be generated that is at a high enough temperature to burn away the isolating material and PTFE ring. Systems of various embodiments provide a metal core backup seal and a compression limiter, which, respectively, prevent the media from leaking from the joint and maintain bolt load at the flanges.
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International Searching Authority, “Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration,” May 8, 2009.
Anderson Thornton J.
Kramer Ben D.
Ruz Sigfrid
Tanner T. Scott
Corrosion Control Corporation
Hewitt James M
Holland & Hart LLP
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