Our power plant has been operating since 1996 and now we are facing with some problems with our cathodic protection system especially with our Condenser Water Box.
The tube sheet made by carbon steel but clad with titanium. The water box body made by carbon steel and coated by rubber lining. The tubes made by titanium. Soft iron anodes was installed to protect the structure.
However, the current installation of anode only can last up to 9 months. We would prefer the anodes could last for 2.5 year. Now, we are studying the option to used ICCP system but more people against it esp our OEM . They are a bit concern on the danger of H2 induced cracking at titanium expansion joint/transition piece.
If we are to continue using SACP, what's our option? Is there any other SA beside Soft Iron suitable for the application ? Because by increasing the amount of the soft iron installed , it will effect the flow, efficiency of our condenser.
appreciate if you could give your comment on this matter .