While system availability can be captured well using traditional Reliability Block Diagrams (RBD), they are usually limited by the results based on such analysis and, in many cases, are not able to capture multiple flow types. This is due to the fact that those diagrams need to be setup based on reliability rather than the actual physical flow.
Unlike traditional RBDs, Process Flow provides the ability to easily create and simulate various flow models. Both availability and multi-flow type throughput can be modeled to give essential metrics that allow better operational and financial decisions to be made in order to improve processes, increase efficiency, and reduce costs.
BlockSim is perfect. Very interesting and has a lot of tools that simplify my work.