Material for Calcium Hyprchlorite - Failue of both Ti/S.S in your plant Titanium (Unalloyed) should normally be OK for Calcium Hyprocholrite from low to high concentration (10 to 100%) upto 100 deg cent. If wet chlorine concentraton varies due to process operation controls not done properly along with abrasive suspended particles carry over or solid products build up resulting in abrasion with other chemical contaminants in the system not analyzed or evaluated properly, a possibility of Titanium (Unalloyed) getting eroded -corroded is there. S.S. 316/317 will not perform well for Calcium Hypocholorite with such contaminants in the system or suspended wet particles with calcium hyprocholorite with concentration variation in the process due to operational / maintenance problems It is not clear which part is used with Ti material. Which part is used with S.S iin your plant. I sugest that you do a careful evaluation of the process conditions - process and mecahnical design, analysis of products, temperature during operation, agitator /mixer / grinder conditions, solid product build up, how frequently cleaning and flusing is done. Also look at possible entry of other chemical contaminants in the system. that could affect Titanium also. Trust that is of some help to you to look /evaluate your plant operation and maintenance practices thoroughly. C.V.Srinivasan E-mail:nishi@vsnl.com/nishi@hathway.com September 16,2004 >In our calcium hypochlorite unit we have faced with severe >errosion corrosion of equipments espasially the parts of >grinders ,baskets and screw conveyers.We have used Ti and >austenetic S/S but in all the cases the parts faiuled after >a period being in seviece. The corrosive calcium >hypochlorite , wet cl and solid process make it difficult to >select suitable material in this service. >Any comments with respect the subject and substitution of >the material would be apprecuiated. >masoud