Page 192 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

174 Major Process Equipment Maintenance and Repair

SIUKNO IOX
Figure 4-21, Repacking fan stuffing boxes. (Courtesy CBlCP Ltd.)

shafts, place in a suitable container with a clean petroleum solvent
or kerosene and soak. Slowly and carefully rotate each bearing by
hand to help dislodge any dirt particles.
2. Remove all old grease and oil from the housing and clean the hous-
ing with white kerosene or other suitable solvent. Carefully wipe all
parts dry with a clean cloth to prevent dilution of the new lubricant
by solvent.
3. When bearing grease is badly oxidized, soak in light oil (SAE 10
motor oil) at 200-240°F before cleaning as discussed in the prior
steps. Flush the clean bearing in light oil to remove any solvent.
4. Reassemble and add lubricant to the proper level.

Repacking Stuffing Boxes
1. Clean out all old packing including that below the lantern ring.
Flexible hooks are available for packing removal. See Figure 4-2 1
for typical stuffing box details.
2. Remove any nicks or score marks found on the shaft with emery
cloth.
3. Clean the stuffing box housing, and the channels and holes of the
lantern ring.
4. Cut new packing rings to length so that the ends meet but do not
overlap.
5. Immerse the entire ring in oil before installing. Start by installing
one end of the ring and bring it around the shaft until it is com-
pletely inserted in the stuffing box.