FIELD: petroleum industry. SUBSTANCE: apparatus has coalescence chamber made in the form of casing axially aligned with housing. Blind partition wall is positioned in annular gap so as to define hydraulic cyclone in lower part of housing. Shelf blocks of hydrophobic material may be arranged in mentioned annular gap. Casing height and area ratios to other dimensions of apparatus are recited in Specification. Coalescence charge is produced from polystyrene. Apparatus may be used for purifying petroliferous water in formational pressure supporting system. EFFECT: increased water purifying extent and simplified construction. 6 cl, 2 dwg, 1 tbl
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