Real values of local loss coefficients for flow through pipe sudden contraction (contraction ratio d/D € (035, 0,82) were determined. Variations (in time and vicinity of resistance) and the influence of the Reynolds anmber (Re € (1000, 50000)) on phenomena in the vicinity of sudden contraction were taken into account. Experimental values of ζ coefficients were referred to flow structure in the vicinity of sudden contraction researches. It was pointed out that (for the Reynolds number Re d > Re gr - corresponding to orderly structure of velocity field) obtained ζ coefficient values are lower than those used in engineering calculations.
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