Technical data

NOTE: Most packing requires lubrication.
Failure to lubricate packing may shorten the life
of the packing and pump.
Dynamic Seal Option: The 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 off. 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 hole can be provided
for this purpose. A drain hole can also be supplied to
drain repeller chamber if 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 tip 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
rotary back on the sleeve until it is about 1 inch
beyond the stuffing box face. Push the gland
back onto the studs, pushing the rotary back
along the sleeve. Tighten the gland nuts. This
ensures contact, no other adjustments are
needed. The lip seal is pressed into the gland and
no adjustment is required. Both seals are
designed to run dry, so no flush is required.
PRIMING PUMP
Never start the pump until it has been properly
primed. Several different methods of priming can be
used, depending upon type of installation and service
involved.
Suction Supply Above Pump:
1. Slowly open the suction valve (Fig. 15).
2. Open air vents on the suction and discharge piping
until water flows out.
3. Close the vent valves.
DI- ISCLATICN VALVE
c+Ecx VALVE
SurTIrn ISOU’TION VALVE
Fig. 15
Suction supply below pump: A foot valve and
outside source of liquid may be used to prime the
pump. Outside source of liquid can come from a
priming pump, pressurized discharge line, or other
outside supply (Fig. 16 and 17).
1. Close discharge valve and open air vents in casing.
2. Open valve in outside supply line until only water
escapes from vent valves.
3. ClOSe the vent valves and then the outside supply
line.
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