Used Southern Heat Exchanger approximately 139 Sq. ft. 316L stainless steel vertical shell and tube heat exchanger. 16" diameter X 10' face to face length. 316L S/S shell rated 150 PSI @ 20 to 350 degrees F. (71) 3/4" 316L S/S tubes rated 25 PSI @ 20 to 350 degrees F. National Board # 5652, S/N 89-180A.