Abstract: For tank pumps that convey foods, strict design requirements apply. A particular challenge is that the liquid is situated both within and outside of the tube. The pump must be easy to clean by flushing or easy disassembly, which makes the design complicated. For this reason, no bearings of the shaft can be used except at its ends. In order to mount a long shaft only at its ends, it must be very rigid and, at the same time, light, since the tank pump is moved by hand. The mass inertia of the shaft is not allowed to be too great, so that it can be driven by traditional motors. In order to make a shaft possible that is both light and bend-proof, a hollow shaft is used. This shaft is a shaft tube, at the ends of which connection pieces composed of a solid material are welded on.