  On the basis of a simple model we analyse the influence of disorder on
critical temperature T_C in p-wave superconductors. The disorder is treated by
means of the Coherent Potential Approximation (CPA) and we focus our attention
on the effect of a van Hove singularity near Fermi energy E_F. For the
appropriate values of its parameters our model reproduces the experimentally
found behaviour of Sr2RuO4.
