Galvanic corrosion between CS and Duplex
Galvanic corrosion between CS and Duplex
(OP)
Dear All
I am having a question from my client whether i need to take consideration of galvanic corrosion between CS and Duplex.
Front channel(tubeside) of HExchanger is CS and tubesheet-tube & shell is 31803. Water is thorugh tubes & front channel and H2S gas is on shell.
There is a gasket between tubeside flange and tubesheet.
Should i consider the galvanic corrosion.
According to NACE CORROSION ENGINEER'S REFERENCE BOOK (3 edition) Galvanic cooriosn happens with two dissimilar materials with corrosive electrolyte.
In this case H2O is the electrolyte which has contact with both CS and duplex and H2O is not corrosive. The H2S doesnt contact CS.
If yes, what shall i can do to prevent it.
Please advice.
thanks
I am having a question from my client whether i need to take consideration of galvanic corrosion between CS and Duplex.
Front channel(tubeside) of HExchanger is CS and tubesheet-tube & shell is 31803. Water is thorugh tubes & front channel and H2S gas is on shell.
There is a gasket between tubeside flange and tubesheet.
Should i consider the galvanic corrosion.
According to NACE CORROSION ENGINEER'S REFERENCE BOOK (3 edition) Galvanic cooriosn happens with two dissimilar materials with corrosive electrolyte.
In this case H2O is the electrolyte which has contact with both CS and duplex and H2O is not corrosive. The H2S doesnt contact CS.
If yes, what shall i can do to prevent it.
Please advice.
thanks





RE: Galvanic corrosion between CS and Duplex
Another way is to use insulating kits for the flange bolting, to disrupt the electrical continuity and then no more galvanic corrosion, simple as that.
Cheers,
gr2vessels
RE: Galvanic corrosion between CS and Duplex
RE: Galvanic corrosion between CS and Duplex
REGARDS
LM
RE: Galvanic corrosion between CS and Duplex
Mechapower, in this site http://w
RE: Galvanic corrosion between CS and Duplex
S
Corrosion Control
RE: Galvanic corrosion between CS and Duplex
Cheers,
gr2vessels
RE: Galvanic corrosion between CS and Duplex
Thank you very much for your valuable suggestions. I was outside of country so couldn't reply you back.
I have talked with few heat exchanger vendors reagrdign this galvanic corrosion and surprisingly they are not aware of it.
The cooling water for the Heat exchanger will be PH controlled. And i read in many placed that pure water is not an electrolyte. But i have some confusion about it.
I have decided to use isolation kit to the bolts.
Again, thanks all for your suggestions.
RE: Galvanic corrosion between CS and Duplex