Arrow is the leading commercial software for compressible gas and steam flow analysis. Analyzing compressible gas flow with hand calculations is nearly impossible, and relying on adjusted hydraulic flow equations can yield dangerously inaccurate results. Arrow enables engineers to simulate and analyze pressure drop, flow distribution, and other key parameters in complex gas systems. With advanced capabilities for simulating real gas behavior, sonic choking, and intricate system geometries (including branching and recombining flows), Arrow helps engineers design safer, more efficient, and cost-effective systems.