METHOD OF ERECTION OF PIPE LINES Russian patent published in 2001 - IPC

FIELD: erection of main pipe lines used for transportation of gas or oil; repair of defective sections of main pipe lines. SUBSTANCE: pipe line is tested under pressure P_test.; then this pressure is reduced and is maintained in the course of ballasting and filling the section under test, after which pressure is raised again to P_test and section is again kept under this pressure. Invention contains mathematical dependence of pressure in pipe line on geometry of pipe line, material and operating conditions. EFFECT: enhanced operational reliability due to reduction of stresses in pipe walls during ballasting and pouring with soil. 1 dwg, 2 ex