THERMAL BUSHING T006
This bushing is mounted in the end of the stuffing box to provide a thermal barrier for the stuffing box.
The bushing should be manufactured from a material that is chemically compatible with the fluid you are pumping and has poor heat conducting qualities. Carbon graphite is the most popular choice.
When used in this arrangement the stuffing box should be “dead ended” and the stuffing box cooling/ heating jacket (B) should be used to control the stuffing box temperature.
This is one of the better methods of controlling stuffing box temperature when the pump is stopped.
Try to make the close fitting thermal bushing as long as possible. At least 1/2″ (15mm) is desirable and try to keep the shaft to bushing clearance as small as practical.