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Comment Processing & Handling

A mag-drive pump that handles suspended solids

By Gerald Ondrey |

In critical pumping applications involving toxic or expensive products, the use of double mechanical seals or external flushing fluids can lead to product contamination or leakage, as well as additional costs for installation and monitoring. Although hermetically-sealed pumps, such as magnetically-driven (mag-drive) pumps can prevent such problems, mag-drive pumps run into problems when pumping fluids with suspended solids, says Mario Monza, export sales manager at CDR Pompe S.r.l. (Bollate, Italy; www.cdrpompe.com). CDR Pompe has resolved this drawback, with its newly developed XTN-XTS pump series, which will formally be launched at next year’s Achema trade fair.

The XTN-XTS series features a patent-pending, dynamic-shaft design with an open style impeller, which allows solids to circulate inside the pump, explains Monza. All passages between static and rotating parts are designed — using strategically located pressure differences inside the pump — to avoid resistance to circulation and accumulation of solid particles (diagram). A “generous” axial canal on the pump shaft eliminates axial-thrust forces, and allows for the circulation of solids. Finally, diamond-coated SiC bushes are used to protect from dry-running and increase abrasion resistance, he says.

In a field application at a pharmaceutical manufacturer, the pump has operated successfully for over one year, says Monza. The XTN-XTS prototype was used for pumping organic solvents with a fluctuating solids concentration of between 10 and 30%, with organic solids size up to 1 mm.

The company is now ready to commercialize the pump series, and plans to offer models in 316 stainless steel or lined with PFA (perfluoroalkoxy alkanes). Pumping capacities range from 10 to 60 m3/h with heads up to 50 m.

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