FIELD: heating.
SUBSTANCE: invention relates to gas industry. Prior to feeding air into pipeline to be dried, air is bled from atmosphere by centrifugal fan and fed into heat exchanger heated by pipe drying furnace used in isolating pipelines. Heat exchanger air is heated to temperature not exceeding pipeline heat resistance. Nitrogen is fed into pipeline after drying by heated air, not allowing neither pipeline cooling down nor condensate formation. Proposed device comprises unit to feed air to dried pipeline consisting of heat exchanger representing a ribbed pipe and air discharge branch pipe. Said pipe accommodates pipeline drying furnace used in isolating pipelines. Device comprises nitrogen gasificator, centrifugal fan arranged at heat exchanger inlet and provided with inlet branch pipe communicated with unit to feed air to dried pipeline. Bypass is furnished with gate valve.
EFFECT: higher efficiency, reduced time.
2 cl, 1 dwg
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