Get current pricing for Celanese Chemical, Celanese Chemical 58 58 Sq.ft. 316-ss Heat Exchanger, By Celanese Chemical, H-4285-d. U-tube. (12) 1 Dia X 9 Long 316ss Tubes, Rated 1000 Psi @ 500°f. 8 Dia. . Product Category: Process Equipment, Sub Category: Process Heat Exchangers: