3- Horizontal Units Installed in a Vertical Parallel Stack, 24 in. x 267 in. (approx. OAL) 1287 gal. Total Capacity, s/n 149. Shell Cladding: 300/390 psig @ 400 F Design Temperature, 40/52 psig @ 400 Design Temperature, Steam Cladding, Alloy 20 Material of Construction, Insulated with Metal Cladding Exterior, Piping and Valve Manifold and Instrumentation; Co. No. ME203B.