TP40-160/2 Shaft Seals Manual

29
Types of shaft seals
Shaft seals
Grundfos type E
Grundfos type E seal is defined as a O-ring seal, type
A, cartridge type.
Description/features
• Strong seal drivers transmit the torque even under
extreme operating conditions.
• Risk of fretting (wear corrosion) in corrosive liquids.
Fretting occurs when an O-ring wears the protective
oxide film of a stainless steel shaft.
• Risk of deposits around the O-ring as well as sei-
zure of the O-ring in liquids with a large content of
lime or sludge.
• As standard available in tungsten carbide/carbon,
tungsten carbide/tungsten carbide or in tungsten
carbide/hybrid with EPDM or FKM O-rings.
• Can be replaced without dismantling the pump part.
In addition, the shaft seal of pumps with motor sizes
above 7.5 kW can be replaced without removing the
motor.
• Only available for pump types CR 32 to CR 90 and
CRN 32 to CRN 90.
Fig. 39
Type E seal
Application profiles
The type E seal has the following application profiles:
• tungsten carbide/hybrid
• tungsten carbide/tungsten carbide
• tungsten carbide/carbon.
Type E with tungsten carbide/hybrid seal faces
There is no relation between the indication of suitability
and the pressure-temperature diagram, but together
they form the application profile.
Suitability
Pressure-temperature diagram
The pressure-temperature diagram is based on clean
water.
The figures in the following table refer to the pressure-
temperature diagram.
Note: Noise occurs especially at low speeds.
Fig. 40 Pressure-temperature diagram
TM01 3065 3398
Suitable
Suitable under
certain
conditions
Not
suitable
Alkaline liquids
Acid liquids
Dry running
Solid particles in liquid
Precipitating/lime-
containing liquids
Anti-freeze liquids
Pos. Range
1 Optimum duty range
2
Risk of periodical noise in connection with start-up and
variations in pressure and temperature
TM01 8343 0100
30
25
20
15
10
5
0
0 10 20 30 40 50 60
22 mm
1
2
70 80 90 100 110 120
[bar]
[˚C]