Fig. 28 Corrosion Resistance In Presence Of Chlorides - GEA Grasso M-Series Operating Manual

Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
Hint!
If you fail to adhere to the limiting val-
ues stated in VDI 3803, the manufac-
turer cannot provide any warranty for
water carrying parts within its supplied
components.
Clarification as to whether or not it is
possible to adhere to these limiting
values with the respective water condi-
tions should be agreed on with a spe-
cialist company during the planning
and design phase.
The limiting values as per VDI 3803, as required for
the use of carbon steel components in non corrosive
water systems, are listed below.
Water quality requirements, parameters
Criterion
Appearance
Colour
Odour
pH level at 20 °C
Electrical conductiv-
ity
Soil alkali
General hardness,
for stabilization
Carbonate hard-
ness without hard-
ness stabilizer
Chloride
Sulphur
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
Value Unit
clear, with-
out sedi-
ment
colourless
none
7.5 - 9.0
LF < 220 mS/m
2+
Ca ,
< 0.5 mol/m³
2+
Mg
GH < 20
KH < 4
Cl < 150 g/m³
SO
< 325 g/m³
4
Water quality requirements, parameters
Criterion
Active biological
components
Thickness factor
The use of carbon steel and cast iron is required in
the most of applications water conditioning with cor-
rosion inhibitors.
The use of stainless steel requires very special moni-
toring of water in apply to Chloride contents (risk of
stress crack and pitting corrosion).
°d
°d
fig.28: Corrosion resistance in presence of chlorides
X
Y
A
B
C
Description of Design and Function
KBE < 10,000
EZ
Hint!
Recommend when using plate heat
exchangers in the refrigerant circuit
< 100 ppm Cl while using steel 1.4301
and
maximum 40°C wall temperature in the
plate heat exchanger
< 200 ppm Cl while using steel 1.4401
and
maximum 100 °C wall temperature in
the plate heat exchanger
Chloride ion concentration in ppm Cl
Wall temperature heat exchanger in °C
AISI 304
AISI 316
SMO 254
Value Unit
per ml
2 - 4
-
51