Method of assembly of a dual-walled pipe

Details Method of assembly of a dual-walled pipe Method of assembly of a dual-walled pipe

1974-12-30

1976-03-16

Schroeder, Werner H.

Metal working

Method of mechanical manufacture

With testing or indicating

285 47, 285133A, 285392, 285 93, 29445, 29455R, B23Q 1700

Patent

active

039436187

ABSTRACT:
A method for assembling two pipes into a single section of double-walled, radially-spaced, concentric pipe of sufficient strength for use in a wellbore in a permafrost zone in the earth is disclosed. Connectors having both left-hand and right-hand and internal and external threads connect corresponding internal and external threads on the pipe. Marks on the pipe ends indicate the various thread start points and, in combination with the left-hand and right-hand threads, permits proper alignment of the threads and facilitate threaded assembly of the two pipes into the double-walled section of pipe. Standard sizes of pipe may be used.

REFERENCES:
patent: 572124 (1896-12-01), McElroy
patent: 724675 (1903-04-01), Decker
patent: 861828 (1907-07-01), Grindrod et al.
patent: 3778089 (1974-12-01), Fredd
patent: 3870346 (1975-03-01), Kappeler et al.

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