Any moisture left in the seal or trapped in a gasket will flash to steam when the hot oil enters the seal. This could be dangerous. When using an A.P.I. type gland be sure to check that the quench and drain ports have not been confused with the flush ports. If these ports are connected incorrectly it could be very dangerous. If you are using stationary bellows seals with a cool oil flush be careful to direct the flushing fluid away from the seal face.
Recent tests show that carbon faces always experience some pitting in hot oil applications.
In the past these pits were ignored, but fugitive emission standards dictate that two hard faces should be use in all hot oil applications. The Mc Nally Institute 1986 S. Belcher Rd.