FIELD: equipment for transportation of gas or petroleum. SUBSTANCE: method involves pushing by gas gelatinous viscoelastic piston formed of two parts having different density by sequential supplying of two gelatinous mass portions into inner cavity of gas pipeline. First portion has density equal to that of accumulated substance to be removed, and second portion has density lower than that of first portion and below 1. EFFECT: increased efficiency in cleaning inner surface of gas pipeline, reduced power consumption and simplified method. 1 tbl
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