METHOD OF LAYING UNDERGROUND PIPE LINE Russian patent published in 1995 - IPC

FIELD: laying pipe lines in permafrost. SUBSTANCE: pipe line 3 is laid in trench 1 at depth determined from mathematical dependence given in Description. Pipe line 3 is laid on cushion made of soil whose coefficient of thermal conductivity is lesser than that of base of trench 1 and is filled-in with soil 4 identical to that of cushion which reduces operational costs due to reduction of heat losses in transportation of product through pipe line. EFFECT: reduction of operational expenses due to reduction of heat losses in transportation of products through pipe lines. 2 dwg