FIELD: petroleum processing and petrochemistry.
SUBSTANCE: free spaces of tanks containing crude oil and petroleum products are filled with nitrogen gas at gauge pressure 50 to 500 Torr, nitrogen containing not higher than 5 vol % free oxygen. Such nitrogen is prepared from air via membrane technique. Tanks may be provided with receivers to store required nitrogen.
EFFECT: simplified storage, pumping, and transportation of oil and prevented self-inflammation thereof.
2 cl, 3 ex
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