Corrosion problem in shell and tube chiller
WE ARE USING SHELL&TUBE CHILLER MADE OF ST.ST SHELL AND CU/NI 90/10 TUBES THE COOLANT IS INHIBITED 40/60 ETHYLEN GLYCOL/DEIONIZED WATER. THE COOLANT FLOWS TROUGH ST.ST PIPES TO ALUMINUM FINNED COLD PLATES AND RECIRCULATE TO THE CHILLER.
THE QUESTION IS:
IS ANY CORROSION PROBLEM IS EXPECTED DUE TO TORBULANT FLOW TROUGH THE CHILLER. IF YES, COULD YOU FORESEE, AFTER WHAT PERIOD?
THANK YOU IN ADVANCEJacob Mor
- Ashdod, Israel
I don't think you will face any problem at all to Cu-Ni, SS or Aluminum.
I have used Cu-Ni tubes in Ethylene Glycol (MEG)/water evaporators for years without problem. Cars' aluminum engine blocks service life is a testimony to the efficacy of corrosion inhibitors.
If you want more info consult US Patents (4085063, 3948792, 3340001, 2560839) for antifreeze inhibitors.Vinh Le
- LaCrosse, Wisconsin
If my coolant is water of including 300PPM cl|,my condenser of chiller system will use the tube of Cu. Will it have any corrosion problemHongming Hu
air conditioning and refrigration - Wuxi Jiangsu, China
Just be sure that the last time you back washed the D.I.resin beds that absolutely NO Chloride was left behind and/or is coming through the system. Also look for galvanic corrosion. Test for chloride by 1 drop of 0.1 N Silver Nitrate in a 100 mL beaker of the circulation water. If it clouds there are 50 ppm chlorides present which will eat up the stainless steel.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
and co-author of The Sulfamate Nickel How-To Guide
Impressed Current Cathodic Protection (ICCP) by using DSA titanium anodes will solve the corrosion problem.Vanajambika Jeyakumar
- Chennai, Tamil Nadu, India
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