This document summarizes the design of a water gas shift reactor system. It includes sections on the design objectives, specifications for the feed composition, catalyst properties, and dimensions of the high- and low-temperature shift reactors. It also describes the governing equations, assumptions, and methodology for simulating the reactor system performance. The simulation results show the conversion levels achieved in each reactor, their volumes, and the predicted pressure drops across the reactors. Features of the design are also discussed, along with overall conclusions.