Used 6000 sq ft 304 Stainless Steel shell and tube heat exchanger. Manufactured by Rolle SpA. 304 Stainless Steel Shell MAWP 530PSI@300F. Stainless Steel tubes MAWP 400PSI@200F. 6-Pass horizontal. Type AJU. Carbon Steel heads. Serial #001094. National Board #847. Built 2010.