Get current pricing for Pattertson Kelley, Pattertson Kelley-11644-ID Approx. 1760 Sq.ft. Stainless Steel Shell And Tube Heat Exchanger. Stainless Steel Shell Rated 150 Psi @ 200 Deg.f. (600) 3/4 X 15' 304 Sta . Product Category: Process Equipment, Sub Category: Process Heat Exchangers: