Goulds Pumps 3420 - IOM - Manual (Page 32)

4. Use a wooden split bushing to properly seat the first
two rings of packing. See Fig 16.
5. The stuffing box arrangement in order of installation
is: two packing rings, lantern ring, then three packing
rings. See Fig. 17.
$
CAUTION
Follow instructions to ensure the lantern ring is
located at the flushing connection. Otherwise, no
flush will be obtained.
6. Install the gland halves. Bolt the gland halves together
and mount on gland studs. Tighten gland nuts.
Connection of Sealing Liquid: If the stuffing box pressure
is above atmospheric pressure and the pumpage is clean,
normal gland leakage of 40-60 drops per minute is usually
sufficient to lubricate and cool the packing. Sealing liquid
then, is not required.
An external sealing liquid is required when:
1. Abrasive particles in the pumpage could score the
shaft sleeve.
2. Stuffing box pressure is below atmospheric pressure
due to the pump running with suction lift or when the
suction source is under a vacuum. Under these
conditions, packing will not be cooled and lubricated
and air will be drawn into the pump.
If an outside source of clean compatible liquid is required,
the pressure should be 15 psi (1.0 kg/cm
2
) above the suction
pressure for clean pumpages. For an abrasive pumpage, the
flush water pressure should be 30-50 psi (2.1-3.5 kg/cm
2
)
above the suction pressure.
NOTE: A product flush can be used if a clean
pumpage exists.
NOTE: Most packing requires lubrication. Failure to
lubricate the packing may shorten the life of the
packing and the pump.
28
3420 IOM 8/09
Fig. 17
Fig. 16