Applied Flow Technology Arrow v6.0.1100 AFT Arrow Compressible Pipe Flow Analysis & System Modeling Software AFT Arrow is a fluid dynamic simulation tool used to calculate pressure drop and flow distribution in gas piping and ducting systems. Designed for compressible flow systems containing: Steam Compressed air Chemical and petrochemical process gases Natural gas transport And many more AFT Arrow is particularly useful for: AFT Arrow Video Pipe and Duct Sizing Relief valve sizing and system calculations Compressor and Fan sizing and Selection Control Valve sizing and Selection Simulating System operation and component interaction Choked Flow calculations Evaluating pipe insulation and heat transfer in pipes and heat exchangers Troubleshooting existing systems to determine the cause of operational problems