Goulds Pumps AF (Axial Flow) (6"-36) MXR Bearings" - Manual (Page 43)

AF (6-36) IOM 41
for a properly adjusted stuffing box, depending on
the shaft size and speed, varies from a few drops
per second to a small trickle out of the gland.
LABYRINTH SEALS
Labyrinth seals have been provided to extend the life of
the bearings and prevent premature bearing housing
rebuild. They should occasionally be cleaned
externally and checked for wear, see Fig. 28.
CONNECTION OF SEALING LIQUID
If stuffing box pressure is above atmospheric pressure
and the pumpage is clean, normal gland leakage of 40-
60 drops per minute is usually sufficient to lubricate
and cool packing and sealing liquid is not required.
NOTE: Otherwise an external flush should be used
to lubricate and cool packing.
An external sealing liquid is required when:
1. Abrasive particles in the pumpage could score the
shaft sleeve.
2. Stuffing box pressure is below atmospheric
pressure due to pump running when suction
source is under vacuum. Under these conditions,
packing will not be cooled and lubricated and air
will be drawn into the pump. If an outside source
of clean compatible liquid is required, the pressure
should be 15-20 psi (1.1-1.4 kg/cm
2
) above suction
pressure. The piping should be connected to the
stuffing box flush port inlet.
3. Under extreme temperature and pressure a pipe
should also be connected to the flush port outlet.
NOTE: Most packing requires lubrication. Failure
to lubricate packing may shorten the life of the
packing and pump.
4. An external drip pan (799G) drain is provided to
carry away normal gland leakage, see Fig. 28.
Fig. 28
DRIP PAN
799G
332, 333
Fig. 27
5