Used 2963 Sq Ft Titanium Shell and Tube Head Exchanger. Manufactured by Downingtown Iron Works. 304L SS Shell MAWP 100PSI@100F. (671) 1"Diameter Titanium GR 2 Tubes MAWP 125PSI@700F. (2) Saddle mounted. National Board #38139. Serial 58139. Built 1964.