137 square foot vertical graphite shell and tube heat exchanger. Manufactured by SGL Carbon, size 13-168.Serial number K40751.11. Built 1997. ASME code samped for 75 PSI @ 358 degrees F on shell and tube side.National Board number 945. Shell 13.25" OD x 195" overall length. Openings: Head- 1-8", head 1- 1-4"; Shell 2-4" t 180 degrees opposite sides, 1-1/2". Weight 1850 lbs.