Page 196 - Know and Understand Centrifugal Pumps
P. 196
Pump Shaft Packing
2. Stage two is when the packing gland has been tightened and the
packing compresses. The space occupied in the pump is reduced.
3. Stage three is when the lubricant has extruded from and left the
packing. At this point the packing should be changed
4. Stage four is when there is no lubricant and the carrier fibers have
disintegrated into ashes. The packing becomes hard from
calcification and destroys the shaft or sleeve.
Stage four packing should never be in the pump. It should be changed
at stage three. When the gland follower butts against the stuffing box
mouth and the gland nuts can no longer be tightened, then you’ve
reached stage four. Stay away from stage four in the life of your packing
rings.
179
