Thanks for the input StoneCold and SJones. Because the original HX lasted many years, and the second only months,we believe that the high chlorides that developed from leakage after the first failure is likely the cause of the second failure. I am told the failure appears to be pitting...
Thanks for your response, Latexman. Our mechanical integrity guy's inspection determined that the second failure occured at the welded tube seams from the methanol side (the cold side)presumeably from chloride attack based on presence of 350 ppm chlorides now in the methanol. Removal of the...
We have a large chiller loop (~40k gal)that distributes chilled (-40F) methanol water (60%/40%) to a large number of heat exchangers and condensers. We recently had a 316L ss condenser welded tube failure at the welded seams. Attack appears to have occured from the methanol water side. The first...
Thanks for your comments. I believe there is bronze in the radial bearing and a seal leak could have allowed galvanic corrosion between the CS and bronze. No indication from the mechanics of bearing problems, but then the amount of copper deposited on the CS might not have been enough to cause a...
We have a large capacity closed hydronic heating system charged with 50/50 blend of propylene glycol and demin water. The glycol/water is about 10 years old and was never properly inhibited until about 7 months ago. Prior to inhibiting, the glycol/water was tested and found to have a pH of about...
