Used 848 sq ft 316 Stainless steel shell and tube heat exchanger. Manufactured by Rockaway Tank. (268) .75"Dia 316 SS tubes MAWP 100 PSIG @300F. Shell MAWP 30PSIG/FV@300F. Expansion joint and vapor chest. Serial #R-4559-512. National Board #512. Built 1980.