PIPE LINE TRANSPORT Russian patent published in 1997 - IPC

FIELD: pipe line transport for transportation of liquid and gaseous media through pipe line. SUBSTANCE: pipe line transport is made in form of main pipe line 1 filled with liquid or gas; it is additionally provided with second pipe 2 located inside first pipe. Interpipe space is filled with inert gas 3 under pressure at which pressure of product being transported inside pipe 4 may be increased as compared with pressure created in inter-pipe space by its magnitude, i.e. no less than by 1.01 times. EFFECT: avoidance of damage to pipe line and reduced ecological injury in case of damage. 2 cl, 1 dwg