Grundfos Peerless Pump 8196 Series, Installation, Operation And Maintenance Manual

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II-Q. STUFFING BOX
1. Packing: Stuffing box packing is installed at the factory. Gland bolt nuts should be installed finger tight only.
Packing cannot run dry; it must be lubricated. If the pumped liquid is clean, cool fluid, it may be used through
a bypass off the discharge to the lantern ring connection to lubricate the packing. If the pumped liquid is dirty
or hot, it is not suitable to lubricate the packing. An external source must be utilized, unless the bypass is
equipped with proper separator, filter, and/ or cooling system. This must also be piped into the lantern ring
connection (refer to packing recommendations).
2. Mechanical Seals: When mechanical seals are supplied, they are installed and adjusted at the factory. They
must not run dry or encounter abrasives in the pumped liquid. Connect recirculation, flush, and/ or cooling
lines as required, following instructions on the seal drawing supplied. On the cartridge type seals installed at
the factory, the centering clips are removed. Follow instructions
on the seal drawing supplied. .
PACKING RECOMMENDATIONS
1. General Service Packing·- This is an Aramid-PTFE synthetic packing. It is best suited for cold water
and general service applications. It has a PH range of 0 to 12 and a maximum operating temperature of
500 degrees F. This packing is like Crane type 1345 or equal.
2. Chemical and Solvent Packing - This is a PTFE-Synthetic packing. It is used for severe chemical and
solvent applications. It has a PH range of 0 to 14 and a maximum operating tempera ture of 500 degrees
F. This packing is like Crane type C1065 or equal.
3. High Pressure and Temperature Packing - Often called Graphoil, it is used in high pressure and
temperature applications. It has a PH range of 0 to 14 and a maximum operating tempera ture of 750
degrees F.
PACKING SIZE
The following is a list of the standard packing size for all process pump models.
Frame Packing Approx. No. of Lantern
Size Size Length Rings Ring Width
.
STP 5/16 x 5/16 4.75 5 7/16
MTP 3/8 x 3/8 5.75 5 5/8
LTP 3/8 x 318 7.0 5 5/8
XLTP 7/16 x 7/16 8.0 5 5/8
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