manufacturers' installation drawings are attached to the pump. The seals are installed and adjusted at
the factory. The manufacturer's drawings should be filed for future use in maintaining the seal and in ad-
justing the seal when the pump is disassembled. To properly prepare the seal for operation, various cool-
ing and flushing flows may have to be connected. In some cases, these flows are recirculated from the
pump casing; in others, liquid from an outside source may be used. Connect cooling and flushing flows
to seal as directed in subsequent steps.
5.7 Connection of Sealing Liquid or Grease Lubricator (Packed
Box)
If the stuffing box pressure is above atmospheric pressure, and the pumpage is dean, normal gland leak-
age of 40 to 60 drops per minute is usually sufficient to lubricate and cool the packing and sealing liquid
is not required.
Sealing liquid or grease lubricator is required when:
1.
Abrasive particles in the pumpage could score the shaft or sleeve.
2.
Stuffing box pressure may be below atmospheric pressure due to pump running with suction lift,
or when suction source is under vacuum. Under these conditions, the packing will not be cooled
and lubricated and air will be drawn into the pump.
Sealing Liquid
Sealing liquid may be supplied by recirculation of pumpage through a line from the casing to the stuffing
box. If the pumpage is abrasive, an outside source of clean compatible liquid must be used at a pressure
of 30 to 50 PSI above suction pressure.
Grease Lubricator
The grease lubricator is supplied when the use of recirculating pumpage or outside sealing liquid is not
desired. The grease should be insoluble in the pumpage.
5.8 Connection of Cooling Water Piping
Quench Gland
Most pumps which contain stuffing box packing have quench glands. Quenching prevents heat transfer
along the pump shaft to the bearings. Quenching is also most important for smothering vapors and
fumes given off at the stuffing box. This is particularly true on applications such as hot water.
The quenching liquid (usually water) must be from an outside source. It should be piped, with flexible
pipe, into the tapped opening on top of the stuffing box gland. A shut-off valve should be installed.
Bearings
Bearing cooling is available on some units. When it is available, cooling water must be connected to the
jacket when pumping hot liquids. See the temperature limits listed under "Construction Details" in
. Valves should be installed in the coolant supply lines to regulate the flow.
Stuffing Boxes
Some units are equipped with cooling jackets around the stuffing box as standard. It is optional on vari-
ous other models. Coolant lines are connected in the same manner as the bearing cooling lines.
5.7 Connection of Sealing Liquid or Grease Lubricator (Packed Box)
36
3175 Installation, Operation and Maintenance Instructions
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