ITT 3196 i-FRAME - Connection of Sealing Liquid for a Packed Stuffing Box; Dynamic-Seal Option

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
Condition Action
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.
The stuffing box pressure is below atmospheric
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 15 psi (1.01 kg/cm
2
)
above the stuffing box pressure.
Dynamic-seal option
WARNING:
Dynamic seals are not allowed in an ATEX-classified environment.
The dynamic seal consists of two parts:
• Repeller seal
• Secondary seal (one of the following):
• Graphite packing
• Diaphragm seal
Table 9: Dynamic seal part function
Part Function
Repeller seal A repeller seal prevents liquid from entering the stuffing box during
operation. The repeller normally does not require a flush. However, for
services that allow a build-up of solids on the repeller, you must install a
flush connection. If a danger of freezing exists, then you must install a
drain connection to drain the repeller chamber.
Commissioning, Startup, Operation, and Shutdown
Model 3196 i-FRAME Installation, Operation, and Maintenance Manual 53