Get current pricing for Allyn American, 51 Sq Ft SS Heat Exc 56 Sq.ft. Vertical Stainless Steel Shell And Tube Heat Exchanger. Mfd By Allyn American, 1996, Nb Stamped. 316-ss Shell Rated 150 Psi/fv @ 572 De . Product Category: Process Equipment, Sub Category: Process Heat Exchangers: