Used Alfa Laval Thermal Horizontal Spiral Heat Exchanger, 2400 Square Feet, Model 1-H. 316 Stainless steel product contact areas. Hot and cold side rated 125 psi at 250 degrees F. Carbon steel removable heads with 316 stainless steel clad. Openings (4) 4". Mounted on carbon steel saddles. National Board#13862, serial#18229, Built 1987.