HEAT INSULATED STRING SEGMENT

摘要

Heat insulated string segment containing an inner pipe (1) provided with reinforcements (10) on its ends, centrators (4), reflective insulation (2) and gas absorbers (3); and an outer pipe (5) provided with external threads on its ends, a pressure insulating valve (15) providing creation of 10<"4>- 10<"3> mm of Mercury vacuum in an interpipe space (14) between the inner and outer pipe and a connecting coupling (9), wherein in the interpipe space (14) between the inner an outer pipes there are provided steel insertions (6) which are welded to both inner and outer pipes with vacuum- tight seams (7, 8), the said steel insertions (6) being welded in a segment located under the first turn thread of the external thread of the outer pipe (5), and wherein the steel insertions (6) are provided with a groove (11) to create a hollow space with the outer pipe (5).