Note On Packed Pump Operation; 1510-Pf Stuffing Box - Bell and Gossett 1510 Series Instruction Manual

14. Inspect volute "O" ring for damage, replace if necessary.
Install "O" ring around coverplate seat. Slide the bearing
frame / coverplate assembly into the volute (coverplate
flush tube fitting must be to top). Install volute capscrews
and gradually tighten with a star pattern (prevents impeller
rub) to 25-30 ft-lbs. Install drain plug. Close drain valve.
15. Go to step 13 of 1510 Standard Mechanical Seal
Instructions.

1510-PF Stuffing Box

With Packing – Figure 10
5. Remove the impeller capscrew, lock washer and washer.
Remove the impeller and impeller key.
6. Remove hex nuts from packing gland and remove cover-
plate capscrews. Remove coverplate from bracket.
7. Remove packing rings from the stuffing box.
8. Check condition of shaft sleeve and replace if scored or
otherwise damaged.
9. Insert two packing rings in the stuffing box followed by the
lantern ring and then the remaining two pieces of packing.
Make certain that the packing joints are staggered 90
degrees.
10. Install, but do not tighten the packing gland.
11. Install coverplate over the pump shaft, tighten capscrews
per torque chart (See Table 1).
12. Tighten packing gland to compress packing, read note on
packed pump operation.
13. Go to step 11 of 1510 Standard Seal Instructions.
FIGURE 13
SHAFT SLEEVE
SHAFT
BEARING FRAME
10
IMPELLER KEY
SPACER SLEEVE
GLAND
SLINGER
MECHANICAL SEAL
COVERPLATE
O-RING
8G – STANDARD MECHANICAL SEAL CONSTRUCTION

NOTE ON PACKED PUMP OPERATION:

Before starting pump, back off packing gland nuts or screws
until gland is loose. Re-tighten with fingers until gland is just
snug against the first packing ring. Initially, water may run
freely from packing. This is normal and should be allowed to
continue for a period of time before further tightening of the
gland. Tighten gland nuts slowly and uniformly, one flat at a
time.
An adequate leakage rate is not one single value for all pumps
and installations, but is the amount required to provide ade-
quate cooling and lubrication. The required leakage will be
largely influenced by operating pressure, fluid temperature,
shaft speed, etc.
For fluid temperatures in the range of 32° to 190°F, average
leakage rates of 60 to 80 drops per minute are recommended.
However, each individual pump and installation will have
unique operating conditions that will result in broadly variable
leakage rate requirements.
At fluid operating temperatures near the upper limit of 190°F,
the maximum temperature rise of the leakage is particularly
important. A packed pump should never operate with steam
forming at the gland. This necessarily limits the temperature
rise to a maximum of about 20°F. If the formation of steam
persists at higher leakage rates, cooling water must be pro-
vided by means of an external supply, or a heat exchanger
used to cool the by-pass flush.
FLUSH TUBE
VOLUTE
IMPELLER NUT
IMPELLER
DRAIN PLUG
WEARING RING
OPTIONAL
CASING
WEAR RINGS