Hagenbach and Couette correction factors (KHandKC), constituents of the excess pressure drop resulting due to the flow of aqueous polymer solutions through a 2 : 1 pipe contraction have been determined. The data obtained in the present work, combined with those reported in the literature have been correlated in terms of the flow behaviour index(n) and the diameter contraction ratio β. WhileKHcould be correlated in terms ofnand β with reasonable accuracy,KCcould be represented with an overall deviation of 18.9% over a data set of 14 points.