Reactor services include all works around process plants handling catalysts, such as hydrocracker units, FCC reactors or UOP-CCR reformers etc. It begins with the preparation of the installation, which includes a detailed logistic planning, preparatory assembly works and the controlled rapid cooling of the reactor through nitrogen flushing. Catalyst handling includes removing the spent catalyst mass, filtering the material with a view to potentially re-using it in the reactor as well as refilling using the dense or sock loading procedure.