Use a chisel to bend the side of the impeller lock washer (12B)
up against a flat of the impeller bolt, approximately 90° from
the blind hole.
The R440 pumps are furnished with a threaded impeller end of
shaft and a nut instead of the impeller bolt described above.
Assembly is like the above except the nut is a left hand thread.
Tighten the nut to 120 ft. lb.
t) If the pump is fitted with compression packing, this packing
may now be installed. See separate packing instal lation instruc-
tions.
u) Assemble the pump bearing housing and cradle assembly into
the pump casing (5) after replacing the casing gasket (77). Be
careful to align the assembly with the casing so that the impeller
(3) slides freely into the close clearance of the casing ring (6A).
Tighten the casing stud nuts (5C) to 105 Ft.Lb. for 3/4" studs
and 165 Ft.Lb. for 7/8" studs.
v) Rotate the pump shaft (29) by hand to be certain that there is
no internal interference.
w) Bolt the pump to the baseplate. Rotate the pump shaft (29) by
hand to be certain that there is no internal interference.
x) Reassemble the coupling parts, and realign the pump and dri-
ver. See separate instructions.
y) Replace the coupling guard and bolt it securely to the base-
plate. Replace all auxiliary equipment .
z) Lubricate the pump according to lubricating instructions before
operating.
INSTALLATION AND MAINTENANCE OF SHAFT
COMPRESSION PACKING
The proper installation and maintenance of packing to seal a pump
shaft is not difficult, but must be properly done to provide good
packing and pump shaft sleeve life. Most packing must be allowed
to leak. This leakage is the only lubrication for the packing and addi-
tionally provides cooling to remove part of the frictional heat built up
between the shaft sleeve and the packing. Failure to allow sufficient
leakage will result in short packing and shaft sleeve life and
increased power consumption of the pumping unit. It is entirely possi-
ble to stall a centrifugal pump by clamping the packing gland down.
Most Dean pumps are shipped from the factory without packing in
the stuffing box. Die molded packing specified for the service is
shipped with the pump in a separately labeled carton. The pump-
stuffing box must be properly packed before the pump is put into
service.
The stuffing box may be packed either with or without a lantern ring
(also known as a seal cage or lantern gland) as the service of the
pump dictates. When the pump suction pressure is above 100 psig
a lantern ring is not recommended.
PURPOSE OF LANTERN RING
Lantern rings are made of Teflon or suitable metal as the ser-
vice demands. They are of split construction and may be easily
installed or removed without disassembling the pump. A
lantern ring is used in the stuffing box with packing for these
reasons:
1) To permit the introduction of a sealing liquid into the stuffing
box to prevent leakage of air into the pump through the pack-
ing when the pump suction pressure is less than atmospheric
pressure. The sealing liquid may be from an internal seal con-
nection or from an external source.
2) To permit introduction of grease, oil, or other suitable lubricant
to the packing to provide lubrication or cooling
INTERNAL SEAL CONNECTION TO THE LANTERN RING
An internal seal connection is used to inject pumpage from the pump
casing into the lantern ring through the lantern ring connection of the
stuffing box to seal the pump against air leakage as noted above.
It can be used only when the pumped liquid is clean and non-
abrasive.
The pumped liquid introduced through the internal seal connection to
the lantern ring will not seal the pump against air leakage through
the packing when the pump is idle or on stand-by service.
EXTERNAL SEAL CONNECTION TO THE LANTERN RING
The sealing liquid introduced to the lantern ring may be from a
source external to the pump. It must be introduced at a pressure
above seal chamber pressure and must be non-corrosive, non-abra-
sive and 150°F or less in temperature. The connection is made to the
lantern ring connections on the pump stuffing box.
The lantern ring connection on the pump stuffing box is also used to
introduce grease, oil, or other suitable lubricants to the lantern ring.
LANTERN RING NOT USED
When the pump suction pressure is above atmospheric pressure or
the stuffing box is pressure sealed (no impeller balance holes) and
neither internal nor external liquid or lubricant is required to the
packing, the lantern ring is not used and the seal chamber is packed
full with rings of packing.
P
ACKED
S
TUFFING
B
OX
W
ITH
L
ANTERN
R
ING
P
ACKED
S
TUFFING
B
OX
W
ITHOUT
L
ANTERN
R
ING
21
S = When soft packing rings are furnished in a set with metallic rings, install the soft
rings in the locations marked “S”.
