Method of welding lined pipe

Details Method of welding lined pipe Method of welding lined pipe

1981-06-29

1982-11-30

Hall, Carl E.

Metal working

Method of mechanical manufacture

Assembling or joining

295272, B23P 1904

Patent

active

043609619

ABSTRACT:
The ends of two sections of lined pipe (e.g. polyurethane lined steel pipe), in which the lining terminates a definite distance from each pipe end, are butted together, with an internal concentric sleeve spanning the unlined pipe ends and defining an annular hollow casting space at the area to be joined. The butted ends are then welded together at the joint. Thereafter a curable liquid polymer (e.g., liquid polyurethane composition) is introduced into the casting space through an opening in the unlined section of the pipe, and cured to a solid state in situ. The opening is then plugged.

REFERENCES:
patent: 3541670 (1970-11-01), McCrory, Jr.
patent: 3890483 (1975-06-01), Webster
patent: 3916502 (1975-11-01), Bagnnlo

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