Ahadiat Carbon steel is not suitred for ammonium carbamate service. Even dilute ammonium carbamate will affect C.S. S.S 316 L / S.S 317 L or Sandvik 2 RE 69 material would stand ammonium carbamate corrosion. For very dilute ammonium carbamate - even S.S 304 L will do. You have to think of carry over of carbamate solution to the ammonia booster pump. You can possibly think of S.S 316 L line and a NRV (Non return valve) of S.S. 316 L to provent carry over ammonium carbamate solution entering the ammonia booster pump. Trust this is of help to you C.V.Srinivasan Nishi Engineers Pvt Ltd India Nov 11,2005 E-mail:nishi@vsl.com >1) I'm from fertilizer plant business and for the past 5 >years our ammonia booster pump is facing carbamate solution >carry over problem normally during start up and recently it >had caused the pump casing (material carbon steel) to have >internal cracks. > >2) Is carbon steel material sensitive to Carbamate Solution >and will Stainless Steel material(SS316) solve the problem ? > >3) When carry over occured we normally clean the pump >suction strainer with water on line. Is water combined with >ammonia liquid could damage the Carbon Steel casing (is it >highly corrosive) ? > >Thank You