Method for sealing joints in plastic lined pipes

Details Method for sealing joints in plastic lined pipes Method for sealing joints in plastic lined pipes

1975-11-26

1977-10-18

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156275, 156294, 156304, F04B 200, B29C 1906

Patent

active

040544737

ABSTRACT:
The thermoplastic lining at a joint between adjacent lined pipe sections is sealed by means of a preformed elongated flat strip of thermoplastic material having resistance heater elements in spaced parallel relation along either side of the strip. The strip is placed circumferentially around the inside of the joint with the width of the strip bridging the joint and with the heater elements in contact with the respective liners on either side of the joint. Pressure is applied radially outwardly against the strip to urge the strip against the liners, and electric current is then passed through the heater elements to fuse the strip to the respective liners and seal off the joint.

REFERENCES:
patent: 3049465 (1962-08-01), Wilkins
patent: 3061503 (1962-10-01), Gould et al.
patent: 3671346 (1972-06-01), Tsuzuki
patent: 3734795 (1973-05-01), Griffith
patent: 3918749 (1975-11-01), Taylor

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