CAL Optional Design
- 21-
6. Gland packing
The following types of shaft seal structure is available depending on operating conditions (See Table 6-1)
For external flushing, flushing pressure, flushing flow rate and casing cover cooling water flow rate very depending on operating conditions.
For details, refer to the pump data sheet.
Table 6-1 Type of gland packing
Code NA NB NC HW
(2)
VH
Liquid injection system Self flushing Without flushing External flushing Without flushing
Neck flushing by
external flushing
Jacket water cooling None None None Provided None
Sketch
Application
Pumping of clean
liquid, or Ps
(1)
≤
0.05
MPaG
Ps
(1)
≥
0.05 MPaG,
or odorous liquid
(In case where
liquid leakage
from shaft seal
must be
minimized)
Injection from
vacuum tank
(In case where
external flushing is
continued even
while the pump is
not in operation, in
order to prevent air
intake.)
Pumping of clean,
high-temperature
liquid at suction
pressure higher
than atmospheric
pressure
Pumping of liquid
with wearing
ingredients. In case
where gland
packing must be
protected from
corrosion
Pumped liquid
temperature
General
liquid
Below 100°C Below 100°C Below 100°C 100 to 160°C Below 100°C
Heat
medium
－
－
－
100 to 220°C
－
(1)
Ps: Pump suction pressure
(2)
For gland packing HW (with water cooled jacket):
Do not use the liquid with a strong causticity for cooling water because the material of the jacket cover (1650) is a cast iron. The
temperature and the pressure of cooling water should be assumed to be the next.
• Temperature of cooling water: 30
°
C or less (At inlet of cooling water)
• Pressure of cooling water: 0.3 MPaG or less
The cooling water flow rate is different depending on use conditions. Refer to the pump data sheet.
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