Un-Used 1998 API Schmidt-Bretten Plate Heat Exchanger. Model: Sigma X29. S/N: B980069-403. (73) Stainless steel plates. Heating surface area: approx. 259.55 sq. ft. Plate pack dimensions (nominal/minimum): 7.75/7.43 in. Design pressure hot/cold: 150 psi. Design temperature hot/cold: 230 °F. MDMT hot/cold: 32 °F. Test pressure: 225 psi. Inlets/outlets: (4) 4-1/2 in. dia. ports with (8) 5/8 in. dia. attachment bolts at a center-to-center distance of 7-1/2 in. Suitable for industrial and HVAC applications with clean, homogeneous, solid-free liquids. Overall dimensions: 36 in. L x 21-1/2 in. W x 44 in. H.