A method, apparatus, and article of manufacture for performing data mining applications in a relational database management system. The first chamber of the apparatus further includes a collecting surface for attracting the spray droplets, a power supply, and a spray nozzle connected to the power supply for receiving fluid and producing the spray droplets therefrom. The annular elements include elements formed by a number of parts, each part having two ends and extending between adjacent longitudinally extending tubular pipe elements.