Heat insulating tube

Details Heat insulating tube Heat insulating tube

1987-10-14

1988-12-27

Schroeder, Werner H.

Pipes and tubular conduits

Plural duct

Coaxial

138149, 285 47, F16L 918, F16L 3900

Patent

active

047933836

ABSTRACT:
A heat insulating tube, primarily for underground mining, is provided with an outer casing and an inner casing, separated from the other casing by a connecting element and a series of spacer rings. The distance between the connecting element and the spacer rings as well as between the spacer rings themselves is in the range of about 20 to 50 times the diameter of the inside casing.

REFERENCES:
patent: 3574357 (1971-04-01), Alexandra
patent: 3865145 (1975-02-01), McKay et al.
patent: 4183378 (1980-01-01), Decker
patent: 4332401 (1982-06-01), Stephenson et al.
patent: 4340245 (1982-07-01), Stalder
patent: 4415184 (1983-11-01), Stephenson et al.
patent: 4477106 (1984-10-01), Hutchison
patent: 4480371 (1984-11-01), McStravick et al.
patent: 4531552 (1985-07-01), Kim
patent: 4570679 (1986-02-01), Schippl

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