Used 1,000 sq ft Stainless Steel Shell and Tube Heat Exchanger. Manufactured by Southern Heat Exchanger Corp. Shell rated 75 psi @ 250°F, (102) 0.75" 316L tubes rated 75 psi @ 250°F. 16" dia. x 34'6" long. National Board #3540, Serial #82-115, Built 1982.