FIELD: machine building.;SUBSTANCE: from the beginning moment of the additive introduction to the tested linear section of pipeline, flow rate of pumped liquid is kept constant and pressure difference measurement is performed continuously on ends of the tested linear section. Time interval is measured from the beginning moment t0 of the additive introduction to the beginning moment t1 of pressure difference reduction on ends of linear section of the pipeline. After that, time interval is measured from the beginning moment t0 of the additive introduction to the beginning moment t2 of interruption of pressure difference reduction on ends of linear section of the pipeline. Distance Lak of initial boundary of effective operation of the additive from the place of its injection is determined as per the following equation: Lak=V (t1-t0), where V - pipeline liquid velocity. Distance L2 of final boundary of the additive effective operation from the place of its injection is determined as per the following equation: L2=V (t2-t0).;EFFECT: providing the possibility of determining the boundaries of the effective operation section of turbulent viscosity reducing additive.
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