Welded flange connection

Details Welded flange connection Welded flange connection

2005-01-11

2005-01-11

Bochna, David (Department: 3679)

Pipe joints or couplings

With assembly means or feature

Molded joint facilitator

C285S021200, C285S368000, C029S890140

Reexamination Certificate

active

06840545

ABSTRACT:
A welded flange connection and methods and apparatus for producing the connection are disclosed. A weld insert is disposed between the flared ends of abutted plastic pipe or plastic-lined pipe sections. The weld insert includes an annular support disc having a resistance heating element disposed at least about the inner circumference of the disc. When held tightly between the flared ends of abutted pipe sections power can be applied to the heating element to produce sufficient heat to temporarily raise the temperature of the adjacent surfaces of the flared sections of pipe above their melting point. When the weld is cooled, a strong, fluid-tight, thermoplastic weld is formed. A welded flange connection using the weld insert of the present invention effectively and efficiently produces high quality, fluid-tight connections in plastic pipe and plastic-lined piping systems. Further, by reapplying power to the insert which remains embedded in the weld, the method of the present invention permits the weld to be easily disassembled when necessary for repairs to the pipe system.

REFERENCES:
patent: 2992838 (1961-07-01), Wallace
patent: 3650550 (1972-03-01), West
patent: 3968552 (1976-07-01), Hunter
patent: 4743320 (1988-05-01), Shaw
patent: 5149142 (1992-09-01), Walko et al.
patent: 5171041 (1992-12-01), McMillan et al.
patent: 5407514 (1995-04-01), Butts et al.
patent: 5478118 (1995-12-01), Barq et al.
patent: 5505898 (1996-04-01), Goto et al.
patent: 6394501 (2002-05-01), Bryant, III
patent: 6398264 (2002-06-01), Bryant, III

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