In this paper the modelling of condition monitoring information for three c
ritical water pumps at a large soft-drinks manufacturing plant is described
. The purpose of the model is to predict the distribution of the residual l
ifetimes of the individual pumps. This information is used to aid maintenan
ce management decision-making, principally relating to overhaul. We describ
e a simple decision rule to determine whether maintenance action is necessa
ry given monitoring information to date.