Disclosed is a system for conveying particulate material, in which particulate material is conveyed along a conveying pipeline (117) by a flow of a conveying gas. A plurality of injector arrangements (121) are positioned along the conveying pipeline, for injecting a continuous flow of conveying gas into the pipeline. The system includes pressure differential apparatus for detecting whether a pressure differential in the pipeline between an injector arrangement and an adjacent injector arrangement is above or below a threshold value. In use each injector arrangement is operable to increase the flow rate at which conveying gas is injected into the pipeline when a pressure differential rises above the threshold value is detected between adjacent injection locations along the pipeline. The present invention provides a continuous flow of conveying gas at each of the plurality of injector arrangements, reducing the risk of blockage. Pressure differentials along the conveying pipeline are reduced. Together this facilitates stable and predictable conveying of the particulate material and reduced conveying gas usage.