Manual

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 illustrations
shipped with the seal.
Seal flushing methods
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 5 to 15 psi (0.35 to
1.01 kg/cm
2
) greater than the seal chamber pressure. The injection rate must be 0.5
to 2 gpm (2 to 8 lpm).
Other You can use other methods that employ multiple gland or seal chamber
connections. Refer to the mechanical seal reference drawing and seal flush/cooling
piping diagrams.
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.
Connection of sealing liquid for a packed stuffing box
WARNING:
Packed stuffing boxes are not allowed in an ATEX-classified environment.
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
If... Then...
The stuffing box pressure is above atmospheric
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.
Commissioning, Startup, Operation, and Shutdown
52 Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual