District-heating line and a method of manufacturing the same

Details District-heating line and a method of manufacturing the same District-heating line and a method of manufacturing the same

1980-03-17

1981-09-08

Askin, Laramie E.

Electricity: conductors and insulators

Combined fluid conduit and electrical conductor

29433, 73 405R, 137551, 156 79, 174 11R, 264 465, 264229, 340605, F17D 506, F16L 5500

Patent

active

042886538

ABSTRACT:
A district-heating line comprising an inner metal tube intended for the transfer of heating medium and encircled by an insulating layer of foamed plastic. Arranged around the insulating layer is a protective tube. To enable an alarm to be given in the event of a fault in the line, there is fixedly mounted on the outer cylindrical surface of the metal tube, an elongated block which carries at least one alarm conductor, said conductor being grouted in a fixed position in an associated channel in the block by the foamed plastic insulating material. In this way, the alarm conductor can be fixed at a given distance from the metal tube, to facilitate the localizing of a fault.

REFERENCES:
patent: 243282 (1881-06-01), Maxwell
patent: 4013924 (1977-03-01), Christensen et al.

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