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Method
Description
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
seal flush/cooling piping diagrams.
5.11.3 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.
5.11.4 Connection of sealing liquid for a packed stuffing box
WARNING:
The mechanical seal must have an appropriate seal-flush system. Failure to do so
will result in excess heat generation and seal failure.
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.
An outside source of clean compatible liquid is
required.
You must connect the piping to the lantern ring connection with a 40
to 60 drops-per-minute leak rate. The pressure must be 1.01 kg/cm
2
| 15 psi above the stuffing box pressure.
5.11 Shaft-sealing options
64
XHD Installation, Operation, and Maintenance Manual
Summary of Contents for XHD
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