FIELD: mechanical engineering. SUBSTANCE: gallery is not continuous; it is made in separate sections along length of pipe line. Casings with insulation are located between gallery sections. System is provided with casings for working and reserve pipe lines and additional casing for repair. Pipe lines have joints at casing inlet. Ends of casings are located inside gallery sections. Pipe lines are provided with detachable sectional fins between joints. EFFECT: enhanced reliability. 2 cl, 4 dwg
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