TP40-160/2 Shaft Seals Manual

46
Pumped liquids
Shaft seals
Acids
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
Acetic acid
CH
3
COOH
Max. temp. [°C] 20 20 20 20
Max. conc. [%] 5 5 5 5
Suitability ++ – + – – – ± – ±
Comments
Acetic anhydride
(CH
3
CO)
2
O
Max. temp. [°C] 20 20 20 20
Max. conc. [%] 3 3 2 2
Suitability ++ – + – – – ± – ± –
Comments Aqueous solution (forms acetic acid).
Benzoic acid
C
6
H
5
COOH
Max. temp. [°C] 80 80 80 80
Max. conc. [%] 5 5 5 5
Suitability – ++ – + – – – + – +
Comments
Chromic acid
CrO
3
Max. temp. [°C] 20 20 20 20
Max. conc. [%] 20 20 20 20
Suitability ++ ++ + + – – – – – –
Comments
Citric acid
HOC(COOH)(CH
2
COO
H)
2
Max. temp. [°C] 80 80 80 80 40 40 40 40
Max. conc. [%] 50 50 50 50 5 5 5 5
Suitability ++ ++ + + – – ++ ++ + +
Comments
Formic acid
HCOOH
Max. temp. [°C] 20 20 20 20
Max. conc. [%] 50 50 5 5
Suitability ++ – + – – – + – + –
Comments
Hydrochloric acid
HCl
Max. temp. [°C] 15 15 15 15
Max. conc. [%] <0.1 <0.1 <0.1 <0.1
Suitability ± ± ± ± – – – – – –
Comments Risk of pitting on stainless steel parts.
Lactic acid
CH
3
CHOHCOOH
Max. temp. [°C] 20 20 20 20 20 20 20 20
Max. conc. [%] 50505050 20202020
Suitability ++ ++ + + – – + + + +
Comments
Nitric acid
HNO
3
Max. temp. [°C] 20 20 20 20
Max. conc. [%] 30 5 30 5
Suitability ++ + ++ + – – – – – –
Comments
Oxalic acid
(COOH)
2
Max. temp. [°C] 20 20 20 20 20 20 20 20
Max. conc. [%] 15 15 15 15 5 5 5 5
Suitability ++ ++ + + – – ± ± ± ±
Comments
Phosphoric acid
H
3
PO
4
Max. temp. [°C] 60 60 60 60 50 50 50 50
Max. conc. [%] 60856085 15151515
Suitability + ++ + + – – ± ± ± ±
Comments Shaft seal with flush in concentrations above 50%.
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