6. Wipe a small amount of grease in the groove of the
flush gland halves.
7. Work the split lip seal into the groove of one of the gland
halves.
8. Position the split such that it is away from the gland,
allowing the assembly to be placed around the drive shaft.
The lip of the seal should face away from the pump’s
bearings.
9. Work the lip seal into the groove of the remaining gland
half.
PACKING QUANTITY GUIDELINES
No. of Packing Rings
Drive End
Size
Without Lantern
Ring
With Lantern
Ring
E
F
G
H
J
K
8
9
7
7
7
7
6
6
6
6
6
6
10. With the seal in position and the gland halves held
together, install the two stainless steel cap screws.
11. Install the gland studs.
12. Slide the gland assembly onto the gland studs
finger tight.
13. Thread the appropriate hex bushing (depending on
flush gland inlet size) into the flush gland.
14. Thread the pressure regulator and pressure gauge
assembly into the hex bushing.
Note: The pressure regulator will reduce inlet water to below
8 psig, protecting the flush gland lip seal. Failure to
utilize the pressure regulator may result in premature
pump failure.
4-56. OPERATION
A flushable packing gland can be operated in one of
two ways:
• If the process fluid is relatively clean (non-abrasive) and
cannot be diluted by water flushing, allow it to leak along the
shaft, to provide both lubrication and heat dissipation. The
leakage will spill into the gland and be flushed to the drain.
No lantern rings are required, only the number of packing
rings listed in the above table. If the gland is operated this
way, pipe plugs should be installed in the 1/8-inch NPT holes
in the stuffing box.
• For applications involving abrasive fluids that can be
diluted somewhat with flush water, it is recommended that you
equip the stuffing box with lantern rings and install a water flush
line in the 1/8-inch NPT hole. Excess water spilling into the
gland can be plumbed to the drain. Install a pipe plug, instead
of a water supply line, in the flush gland inlet.
Page 27
Having determined the best alternative for your
application, install all hardware, leaving the flush gland drain
unconnected for now. Packing gland nuts should be evenly
adjusted so they are a little more than finger tight.
Overtightening the packing may result in premature packing
failure and possible damage to the drive shaft.
1. Start the pump and water flush the stuffing box if applic-
able (do not start the water flush in the gland at this point).
2. Adjust the gland nuts until you obtain a leakage rate of
1-2 drops per second. The flush gland drain must be discon-
nected to adjust the rate.
3. Allow the pump to run, checking the leakage rate every
15 minutes. If leakage becomes excessive, tighten the gland
nuts until the leakage amount is acceptable.
CAUTION: Do not tighten the gland nuts to the point of
zero leakage from the stuffing box.
4. Once the packing has seated and the leakage rate has
stabilized, the flush gland drain can be connected and flush
water can be run into the top side of the gland. Do not place
a throttling valve on the drain side of the flush gland. Do not
produce back pressure by any other way. Back pressure is
not necessary and is detrimental to the function of the gland.
5. Adjust flush water flow rate to an acceptable rate.
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