FIELD: oil-and-gas industry.
SUBSTANCE: proposed tank is intended for underground store of light oil. Said tank comprises inner and outer walls. Said inner wall is composed by at least two plies. Space between inner and outer walls is divided by stiffness ribs. At least one of plies of inner wall is a composite layer based o at least two thermoplastic polymers. On of the latter is polyethylene or polypropylene while ply in direct contact with oil is furnished with elements to remove static electricity, integrated, at least partially, therein. This tank is shaped to cylinder with end plugs and represents a single-piece structure produced by continuous extrusion with helical winding of polymer materials on mandrel in hot state.
EFFECT: higher reliability, electrostatic protection.
26 cl, 5 dwg
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