A physical term accounting for association was taken from the SAFT theory [1] and was implemented in modern (semiempirical) multiparameter Helmholtz equations of state [2] in a way that it can directly be used in common mathematical frameworks in a relatively straightforward way. The implemented physical term contains three fluid specific parameters. In order to prove its capability to accurately describe a typical associating substance even at very low temperatures (down to the triple point) and high pressures (up to 500 MPa), methanol has been selected as target fluid. (C) 2013 Elsevier B.V. All rights reserved.