A dynamic simulation program has been developed to model processes involving fluid compression, expansion, heat generation and heat transfer. Controller design procedures are embedded in the computer code. This allows easy transfer of information between simulation, used to sample the process response to various perturbation, and optimization of controller design and tuning. Equations are developed for some equipment models, based on 1-D flow approximation. The architecture of the simulation package based on the object paradigm is described. The program has been validated on test cases. In particular, compression stems have been evaluated for different strategies.