TP80-40/4 Shaft Seals Manual

48
Pumped liquids
Shaft seals
Alkalis
Legend
++ = Best solution
+ = Suitable
± = Suitable under certain conditions
– = Not suitable
Liquid
Shaft seal (EN 12756)
Rotating face:
Stationary seat:
Secondary seal:
Spring:
Other parts:
Q
Q
E
G
G
Q
Q
V
G
G
B
Q
E
G
G
B
Q
V
G
G
B
V
E
G
G
B
V
V
G
G
U
U
E
G
G
U
U
V
G
G
B
U
E
G
G
B
U
V
G
G
Alkaline degreasing
agent
Max. temp. [°C] 80 60 80 60
Max. conc. [%] 25 10 25 10
Suitability ++ – + – – – ++ – + –
Comments
Shaft seal with flush/double shaft seal may be required; EPDM not applicable, if degreasing
bath contains residue of oil.
Ammonia
NH
3
Max. temp. [°C] 20 20 20 20
Max. conc. [%] 100 100 100 100
Suitability ± – ++ – ± – ++ –
Comments Shaft seal with flush/double shaft seal recommended; attacks copper alloys.
Ammonium hydroxide
(ammonia water)
NH
4
OH
Max. temp. [°C] 90 120 90 120
Max. conc. [%] 28 28 28 28
Suitability ++ – ++ – – – ++ – ++ –
Comments Shaft seal with flush/double shaft seal recommended; attacks copper alloys.
Calcium hydroxide
CaOH
Max. temp. [°C] 80 80 80 80
Max. conc. [%]
Satu-
rated
solution
Satu-
rated
solution
Satu-
rated
solution
Satu-
rated
solution
Suitability ++ + – – – – ++ + – –
Comments
Saturation point at 0.18% at +20°C; shaft seal with flush/double shaft seal recommended for
supersaturated solutions.
Potassium hydroxide
KOH
Max. temp. [°C] 60 20 60 20
Max. conc. [%] 30 5 30 5
Suitability ++ + – – – – ++ + – –
Comments
Shaft seal with flush/double shaft seal recommended for concentrations above 25% due to
crystal formation.
Sodium hydroxide
(caustic soda/soda lye)
NaOH
Max. temp. [°C] 60 20 50 20
Max. conc. [%] 50 50 40 25
Suitability ++ ± – – – – ++ ± – –
Comments
Shaft seal with flush/double shaft seal recommended for concentrations above 25% due to
crystal formation.