Used 2247 Graphite shell and tube heat exchanger. Manufactured by Mersen. Model PYT34-349-20 Polytube HE. Carbon Steel Shell rated MAWP 75 PSIG@340F. Graphite Tubes rated 75PSIG@340F. (2) Saddle mounted. National Board #4331. Serial #S600226. Built 2018. Weight 13750 lb.