Cross section of stuffing box fitted with conventional packing

One can see how the pressure on the packing rings starts from the beginning of the stuffing box and stops after the second ring.
This situation creates an uneven wear pattern on packing and sleeve because in order to get the packing to seal better one must apply greater pressure to the packing, causing more wear.

Due to the increased pressure on the packing the friction and brake effect is increased and causes the unit to draw more power, increasing the cost of operation.

Increased pressure means increased wear, this all leads to utilizing more packing as well as increasing the downtime and manpower required to operate the unit.

The increased pressure and wear subsequently decrease adjustment interval time.