METHOD OF TRANSPORTATION OF GAS BY PIPE LINE LAID IN PERMAFROST Russian patent published in 1999 - IPC

FIELD: erection of pipe lines. SUBSTANCE: method is effected by means of pipe line laid in trench, shield embracing the pipe line and external cooling passages for-transfer agent at temperature below temperature of soil. Passages are placed in zones of bottom and walls of trench to exclude warming-up. Containers filled with mineral soil are used as embracing shield. Cooling passages are connected to section of pipe line running to compressor station. EFFECT: enhanced reliability. 3 cl, 1 dwg