The problem of vaporization in face seals operating on mixtures where
the minority liquid is discontinuous and has the lower boiling point i
s analyzed, A model based on several simplifications is presented and
wed to solve a numerical example for water-in-oil mixtures. It is show
n that even the smallest amount (in the order of 1 %) of water in the
oil may considerably alter the seal performance and result in seal fai
lure.