High Zinc in my Desal water network
High Zinc in my Desal water network
(OP)
hey guys
i have a galvanized steel network for my desalinated sea water in which i found about 3.8 ppm of Zinc is this a sign of corrosion? is galvanized steel a bad choice of material for desal water (conductivity about 10 uS/cm)? Should I be dosing phosphate as a corrosion inhibitor?
i appreciate any advice..
regards
rami kremesti
kremesti.com
i have a galvanized steel network for my desalinated sea water in which i found about 3.8 ppm of Zinc is this a sign of corrosion? is galvanized steel a bad choice of material for desal water (conductivity about 10 uS/cm)? Should I be dosing phosphate as a corrosion inhibitor?
i appreciate any advice..
regards
rami kremesti
kremesti.com





RE: High Zinc in my Desal water network
Galvanized steel piping would probably not be a first choice for any water distribution system. Galvanized steel piping is more common used for piping within a building.
Are you referring to a potable water system? What type of desalination system do you have? Are you presently using a corrosion inhibitor?
RE: High Zinc in my Desal water network
this system is the piping system after the storage tanks for desal water (desalinated sea water using MSF desalination). no corrosion inhibitor is currently being used.
the potable water system comes downstream. also there the LSI is -ve despite the remin filters. the pH is too low (about 7) and already a C-steel heater has corroded...
regards
rami
RE: High Zinc in my Desal water network
The materials of choice for the water distribition would be thermopleastics such as PVC-U, PVC-M, PVC-O, ABS or PE. Some would argue that a cement lined product sould be used. The unbuffered water would leach the calcium form the lining and it would fail.
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RE: High Zinc in my Desal water network
So yes, the zinc is most likely a corrosion product.
A corrosion inhibitor is not recommended since the most economical method to reduce corrosion is to raise the pH of the water.
You will be better off with a different remineralization method.
As Stanier suggests, you can use a remineralization method that uses lime, caustic soda, or sodium carbonate.
The method and equipment that will be necessary to do this will depend somewhat on the capacity of your water system.
http://desline.com/articoli/6327.pdf
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