MODE OF DRAINAGE OF CAVITIES OF PIPELINES AND AN ARRANGEMENT FOR ITS EXECUTION

FIELD: the invention refers to transportation of gas and other hydrocarbon products along main pipelines and may be used at introduction in exploitation of sections of pipelines. ^ SUBSTANCE: mode is based on drainage of cavities of pipelines with combined flow of atmospheric gas and nitrogen in a gas separating block, recirculation of the indicated mixture in the cavity in the drained the pipeline and building-up in it a volume of drained medium with each following cycle of recirculation. The arrangement for executing this mode of drainage of cavities of pipelines has a pumping arrangement, a moisture separator, a gas separating block and a contour of recirculation with shut-off valves and pipelines forming in the drained pipeline a recirculation channel of preliminary dried mixture of an inert gas and air and another channel for blowing humid air and water. At that the recirculation contour has a drained pipeline, a pressing pumping arrangement, a heat-exchanger-cooler and a measuring block. ^ EFFECT: the mode of drainage of cavities of pipelines and an arrangement for its execution must provide drainage of the cavities of pipelines until specified humidity and exclude forming of detonating medium at introduction of pipelines in exploitation. ^ 5 cl, 1 dwg