Abstract: A process for withdrawing solids from a vessel utilizing an inserted nozzle comprising an outer tube and one or more inner tube(s) retracted inside the outer tube, which process comprises introducing an entrainment liquid into the vessel upstream from a pick-area where the solids are withdrawn, introducing dilution transport liquid into the area for solids to be removed through the outer tube in such a way that it does not substantially infludence the flow of the solids and the entrainment liquid introduced upstream from the pick-up area, and withdrawing transport liquid and solids through the retracted inner tube(s).