TP80-160/2 Shaft Seals Manual

41
Types of shaft seals
Shaft seals
Fig. 62 Circulation volume of Cartex-DE
Application profiles
The Cartex-DE shaft seal has the following application
profiles:
• carbon graphite/SiC
• SiC/SiC.
Pressure and velocity diagram
The diagram of the pressure in relation to the velocity
of the seal faces is based on clean water.
Fig. 63
Pressure and seal face velocity
Air-cooled top (for high temperatures)
Fig. 64 CR pump with air-cooled top
General information
The unique Grundfos air-cooled top shaft seal solution
is recommended for applications involving high temper-
atures from +120°C to +180°C.
The following air-cooled top solutions are available:
• Pump fitted with EPDM rubber parts: +120 to
+150°C
• Pump fitted with FKM rubber parts: +120 to +180°C.
Applications
•Boiler feeding
• Temperature control, for instance in moulding proc-
esses
• Circulation of transmission oils.
Pump range
The air-cooled top is available for the following Grund-
fos pumps: +120 to +150°C and +120 to +180°C
Technical description
The air-cooled top separates the seal chamber from the
pump by an air-cooled chamber, generating an insulat-
ing effect similar to that of a thermos.
Through the narrow passage between the pump and
the air-cooled top, a small quantity of the pumped liquid
recirculates by natural circulation.
Temperatures above +120°C normally result in a sub-
stantial reduction of seal life due to poor lubrication of
the seal faces.
TM02 7402 3503TM02 7111 2603
0
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
DW
10
20
30
40
50
60
70
80
90
100
110
120
130
140
I/h
150
160
16010
5
10
15
20
25
0
V (m/s)
P (bar)
Carbon graphite/SiC
SiC/SiC
GR5228
Pump
type
CR
1
CR
3
CR
5
CR
10
CR
15
CR
20
CR
32
CR
45
CR
64
CR
90
CR ------zzzz
CRI zzzzzz ----
CRN zzzzzzzzzz