Goulds Pumps ANSI FAMILY IOM (ATEX Compliant) - Manual (Page 43)

5. Install the gland halves and evenly hand tighten
the 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 and sealing liquid is not required.
NOTE: Otherwise, a product flush can be used
if a clean pumpage exists.
An external sealing liquid is required when:
1. Abrasive particles in the pumpage could score
shaft sleeve.
2. Stuffing box pressure is below atmospheric
pressure due to the pump running with a 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 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. The piping should be
connected to the lantern ring connection with a 40-60
drops-per-minute leak rate.
NOTE: Most packing requires lubrication.
Failure to lubricate packing may shorten the life
of the packing and pump.
Dynamic seals are not allowed in an ATEX
classified environment.
Dynamic Seal Option: The 3196, CV 3196, and
LF 3196 dynamic seal consists of two seals: a repeller
that prevents leakage during pump operation and a
secondary seal that prevents leakage when the unit is
not operating. The repeller acts as a pump to prevent
liquid from entering the stuffing box during pump
operation. The repeller does not require a flush
except for services which allow a build-up of solids on
the repeller. A flush connection can be provided for
this purpose. A drain connection can also be supplied
to drain the repeller chamber if a danger of freezing
exists.
Secondary Seals: The secondary seal prevents
leakage during pump shut down. This seal is either
graphite packing or an elastomeric face or lip seal.
1. Graphite Packing - This packing will provide
adequate life running dry but will provide longer
performance if it is lubricated with either clean
water or grease. When clean water is used,
remember that the repeller reduces both the
quantity and pressure of seal water required. If
the suction head is less than the repeller
capability, the stuffing box pressure is the same
as atmospheric. Seal water pressure must be
high enough to overcome static head when the
pump is not operating to keep pumpage out of the
packing. Flow must be sufficient to cool the
packing. If grease is used as the lubricant, spring-
loaded grease lubricators should be used to
maintain a constant supply.
2. Elastomeric Face or Lip Seal - The elastomeric
face seal consists of an elastomer rotary fitted to
the shaft, and a ceramic stationary seat fitted in
the gland. To set the seal, remove the gland nuts
and slide the gland back on the sleeve. Pull the
ANSIFAM IOM - 5/08
41
Fig. 27
Fig. 28
Fig. 29
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