DEAD ENDING D005
Dead ending means to isolate the stuffing box. No lines in, no lines out.
We do this when we want to control the stuffing box temperature to prevent a seal failure due to the fluid becoming viscous, crystallizing, coking or changing state from a liquid to a gas or solid.
The normal dead ending procedure is to install a close fitting bushing into the end of the stuffing box and then control the stuffing box temperature with a heating/ cooling jacket (B) surrounding the stuffing box.
A thermal bushing in the bottom of the stuffing box is necessary if you want to do a good job.
Many of these jacketed stuffing boxes are covered with an insulation that could be hiding a discharge recirculation line, that will prevent the jacket from doing its job of controlling the temperature in the stuffing box.