Used 90 sq.ft. horizontal shell & tube heat exchangers, Mfg. by Monticello Tank, 316L stainless steel shell rated for 75 psi @ -29/260 Deg C., 316L stainless steel tubes rated for 100 psi @ -29/260 Deg. C. Shell diameter 12.75" O.D., 3/4" Dia. tubes. Previous Service: Primary Distillate Condenser - Grignard