Neeraj: It is quite common to place sacrificial anodes in the channel of a carbon steele shell and tube heat exchanger to mitigate the corrosion you are referring to. Hope this helps! David Hendrix The Hendrix Group Inc.

Neeraj, although you have not mentioned that which sort of chemicals are being dosed in to the cooling tower,and what is the pH of the recirculating water,but one thing that one can asses from the range of LSI(-1.5 to -0.8), is that its an acidic treatment, i am giving you some recommendations and please let me know that you are already complying with that, if not then please do follow that: 1) doze Zinc based chemical with a despersant, and maintined Zn residaul in the range of 2 to 4 ppm. 2) maintain pH in the range of 7.5 to 8.2. 3) maintain total alkalinity in the range of 50 to 300 ppm. 4) used proper biocide to protect your system against microbiologically ifluenced corrosion. 5) you can use soft water and raw water as well. 6) while dosing acid which i think must be Sulhpuric acid please manitained your gypsum cycles in the limit. if you will provide me with data of your raw water analysis and circualting water then i will be able to calculate that at which cycles your system is running. i hope i have conveyed. thank you, Tariq khan