A diagnostic technique to predict the flow patterns of fully developed flows of dilute gas-solids suspensions inside horizontal straight pipes has been developed. This technique is based on the rescaled range analysis of absolute and differential wall pressure fluctuating signals. The Hurst’s exponent, a single statistical parameter that characterizes the wall pressure signals, suggests the flow regime at which the system is operating. The gas-solids suspension generates its own characteristic fluctuations as it flows inside the pipe, which is like a ’finger print’ of each flow regime. Experiments have been carried out in a 2 in pipeline with 3 mm poly(ester) polymers, 450 mu m glass beads, and 450 mu m alumina at different loading conditions so that different flow regimes could be achieved. The study includes the generation of general state diagrams and flow-pattern maps to fully understand the complex behavior of particles conveyed pneumatically through pipelines.