Process for the manufacture of double walled pipe

Details Process for the manufacture of double walled pipe Process for the manufacture of double walled pipe

1981-07-27

1984-02-21

Crane, Daniel C.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29455R, 72170, 72369, B21D 2100, B21D 910, B21D 5306

Patent

active

044321236

ABSTRACT:
The invention relates to a process for the manufacture of a rigid, essentially elbow-shaped coaxial double pipe with a hollow space between inner and outer pipes, consisting of an elbow-shaped cold-bent high-pressure pipe for operating pressures of over 1000 bar as the inner pipe, the two shanks of the elbow each comprising a straight piece of pipe with a length of at least 5 times the outside diameter, and an elbow-shaped cold or hot-bent outer pipe which envelops the inner pipe in a manner as to leave an annular space between inner and outer pipes and extending the length of the outer pipe, with the outer pipe enveloping the bend and one straight shank only. Elbow-shaped coaxial double pipes of this type can, for instance, be part of a heat exchanger of up to 3000 m in length in the form of a coil type cooler comprising a plurality of straight pipes and U-shaped bends.

REFERENCES:
patent: 1908373 (1933-05-01), Loepsinger
patent: 2936019 (1960-05-01), Miller
patent: 3229489 (1966-01-01), Huet
patent: 3293897 (1966-12-01), Holter
patent: 3665601 (1972-05-01), Dunbabin
patent: 3691617 (1972-09-01), Burnett
patent: 4009601 (1977-03-01), Shimizu
patent: 4022019 (1977-05-01), Garcea
patent: 4137743 (1979-02-01), Schwarze

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