5-3
5.2 Shaft
seal
parts
5.2.1
Gland packing (SP (3)/SP (3)-e, MSP/MSP-e)
Caution
Be careful not to tighten the gland packing excessively or unevenly.
Otherwise, it may cause excessive heating of the shaft seal part, or
damage to the gland packing and the main shaft.
(1) Adjust the drip rate from the gland packing as shown the table below. Do not carry out this
adjustment during the initial period of pump operation. If the gland packing is excessively heated,
or drip rate is too small, loosen the gland nut.
A drop of water that drips out of the gland is
about 0.05cc.
20cc/min: The drip amount of the water of
the degree that falls as droplets or like
thread
The drip rate is subject to change according
to the operating conditions.
(2) If the drip rate is not reduced sufficiently after 30 minutes of the initial operation, tighten the gland
nut gradually and evenly, while paying attention to heating of the packing.
(3) The drip rate increases gradually over time. When it reaches roughly twice the value in the table,
retighten the gland nut.
(4) Eventually
，
it will not be possible to tighten the packing retainer any further
．
When this happens
，
replace the packing.
(5) Insert the gland packing rings carefully one by one, as far as it will go. In addition, the rings should
be oriented so that each of their adjacent cut slits will be 90 to 120 degrees apart.
(6) Gland packing is a consumable part. Its life depends on the quality of liquid, having
foreign objects or no, pressure, etc.
Pump suction inlet
diameter
Standard drip rate from the
gland packing (as a guide)
65 mm or less
10 to 20 [cc/min]
80 mm or over
15 to 30 [cc/min]
Nut
Shaft seal part
Main
shaft
Gland packing
Gland packing
retainer
Stud bolt
The figure shows MSP-e.
