Fly Ash Vessels are very simple conveyor systems, manufactured at a relatively low low price. The systems are particularly suitable for the pneumatic conveying of fly ash. Multiple fly ash vessels can be connected to a single conveyor line by serial application of these systems. This will remove the captured fly ash from the various fields of, for example, an ESF, transported to an intermediate buffer, after which the fly ash is conveyed to a more remote storage silo by, for example, a PD-pump or enclosed belt conveyor.