Goulds Pumps AF (Axial Flow) (42"/1200mm/54/60"/66") LM/LMR Bearings - IOM" - Manual (Page 42)

42 AF (42-66) IOM
PACKED STUFFING BOX
If the axial flow pump has a standard stuffing box to
seal the rotating shaft the packing rings were installed
at the factory, but at some point during the life of the
pump they must be replaced. The following steps are
used to replace the standard packing:
1. Drain the system or isolate the pumpage from the
pump before replacing the packing.
2. Remove the nuts from the gland studs that hold the
gland in place.
3. Use a packing puller remove the first (2) rows of
packing from the box.
4. Use threaded rods or a packing puller to remove
the lantern ring from the box.
5. Use a packing puller remove the second (2) rings
of packing from the box.
6. Use threaded rods or a packing puller to remove
the second lantern ring from the box.
7. Use a packing puller remove the final ring of
packing from the bottom of the box
8. Clean the stuffing box of any grit or build-up. Clean
the shaft sleeve prior to replacing the packing. If the
sleeve is damaged now is the time to replace it.
9. Install the packing and lantern ring in the reverse
order of removal, 1 rings of packing, lantern ring, 2
rings of packing, lantern ring, 2 rings of packing, and
the gland. Firmly seat each ring. Stagger joints in each
ring 90
°. Make sure middle of lantern ring lines up with
flush tap in the stuffing box.
10. Die formed packing rings are used when re-
packing a box. Care must be used during their
installation. To install packing, twist the ring sideways
just enough to get it around the shaft. Do not attempt
to pull rings straight out, see Fig. 18.
11. Insert the lantern ring with tapped extractor holes
facing outward from the box, be sure it is aligned with
the flush ports in the stuffing box, see Fig. 19.
12. Install the gland nuts finger tight. Then with the
lubricating supply on and the pump running,
gradually tighten the gland nuts one flat at a time,
while observing the leakage and stuffing box
temperature. Packing requires time to run-in. Allow a
minimum of ½ hour between adjustments. If the
leakage is reduced quickly, the packing will overheat
and may be destroyed. The shaft sleeve may also
become damaged. The normal leakage for a properly
adjusted stuffing box, depending on the shaft size and
speed, varies from a few drops per second to a small
trickle out of the gland.
LABYRINTH SEALS
Labyrinth seals are found on the inboard and outboard
end caps of the bearing housing to prevent
contaminants from entering the bearing housing.
On some older models lip seals were used. These
were assisted by cast slingers that fling contaminant
fluids away prior to reaching the lip seals. Lip seals do
not require any preventative maintenance but should
be replaced during any rebuild operations. They can
be cleaned occasionally from the outside by removing
the slingers.
Fig. 19
PACKING RINGS
CORRECT INCORRECT
Fig. 18