Cooling Water Treatment

[ld25]

I currently am expiriencing weld failures on a cooling water jacket on a high temp stainless furnace. The situation is as follow:

System 95% 316L and 304 stainless
5% copper and bronze
~7ppm chloride levels

Is there any type of chemical to help protect the welds from pitting and failure.

Thanks in advance

 

[abcmex]

Try corrosion engineering forum! Austenitic steels (AISI 304 and 316) are well known to have serious problems with Chloride. The high temperature may make the situation worst.

rgs

 

[bimr]

You have not presented enough information for someone to understand your situation.

However, the chloride concentration of 7 ppm is quite low and probably not an issue. Chloride is generally associated with cracks not pitting.

It would be helpful if you would include information on the temperature, water analyses, and treatment if any.

 

[SMF1964]

Is your damage limited to just the welds? Have you verified that the welds are, in fact, stainless steel? What is the fluid temperature inside these cooling jackets? As < bimr > stated, more information is needed. Possibilities include, but are not limited to, galvanic corrosion (if the welds are dissimilar metal welds), MIC (if the temperatures are low enough), general corrosion (if you have concentration effects from boiling water inside the cooling jacket - 7ppm chloride in the bulk can be 50-50,000 times higher at the boiling water interface) or SCC (if we're dealing with cracking, not pitting).