Exchanger tubesheet is duplex 2205. Channel is carbon steel. The tube fluid is cooling water (1500ppm Chloride, <50DegC). What is the gasket materials for channel flange, Carbon steel, 316L SS, or Duplex Stainless Steel?
On most of our Hx using our CTW or river water, at times brackish, we used a paper gasket of the Vellumoid type. I'll try to see if I can get the currently used material,