5.7.2 Connection of sealing liquid for mechanical seals
Seal lubrication is required
Seal faces must have liquid film between them for proper lubrication. Locate the taps using the illustra-
tions shipped with the seal.
Seal flushing methods
Table 11: You can use these methods in order to flush or cool the seal:
Method
Description
Product flush
Run the piping so that the pump pushes the pumped fluid from the
casing and injects it into the seal gland. If necessary, an external heat
exchanger cools the pumped fluid before it enters the seal gland.
External flush
Run the piping so that the pump injects a clean, cool, compatible liquid
directly into the seal gland. The pressure of the flushing liquid must be
0.35 to 1.01 kg/cm
2
| 5 to 15 psi greater than the seal chamber pres-
sure. The injection rate must be 2 to 8 lpm | 0.5 to 2 gpm.
Other
You can use other methods that employ multiple gland or seal cham-
ber connections. Refer to the mechanical seal reference drawing and
piping diagrams.
5.7.3 Packed stuffing box option
WARNING:
Packed stuffing boxes are not allowed in an ATEX-classified environment.
The factory does not install the packing, lantern ring, or split gland.
These parts are included with the pump in the box of fittings. Before you start the pump, you must install
the packing, lantern ring, and split gland according to the Packed stuffing box maintenance section in the
Maintenance chapter.
5.7.4 Connection of sealing liquid for a packed stuffing box
NOTICE:
Make sure to lubricate the packing. Failure to do so may result in shortening the life of the
packing and the pump.
You must use an external sealing liquid under these conditions:
•
The pumped fluid includes abrasive particles.
•
The stuffing-box pressure is below atmospheric pressure when the pump is running with a suction
lift or when the suction source is in a vacuum. Under these conditions, packing is not cooled and
lubricated and air is drawn into pump.
Conditions for application of an external liquid
Condition
Action
The stuffing box pressure is above atmospher-
ic pressure and the pumped fluid is clean.
Normal gland leaks of 40 to 60 drops per minute is usually sufficient
to lubricate and cool the packing. You do not need sealing liquid.
The stuffing box pressure is below atmospher-
ic pressure or the pumped fluid is not clean.
An outside source of clean compatible liquid is required.
5.7 Shaft-sealing options
Model CV 3196 i-FRAME Installation, Operation, and Maintenance Manual
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