Pharmaceutical heat exchanger INSTANTANEOUS single pass is made with SMOOTH seamless tubes. The tubes are expanded to the tube plates to ensure greater resilience. The preferred choice is usually without an expansion joint, but it can be installed for particularly demanding conditions. Sanitary double tubesheet heat exchangers are made to avoid contamination between the primary fluid and the secondary fluid (FDA Standard). They can be constructed for vertical or horizontal installation, to heat or cool, or a combination of the two alternating phases. The outer coating of the thermal insulation with external finishing in completely sealed and polished AISI 304 stainless steel.