For this research, a two disk-shaped medium-power liquid sodium (Na) electromagnetic pumps on permanent magnets were fabricated. The paper gives an analytical formulation of the magnetic field calculation problem for a disk-type induction pumps. Before the liquid metal experiments in the Na loop, the distribution of the primary magnetic field generated by the permanent magnets was experimentally measured. To compare it with the theoretical simulation, a numerical 3D model of the magnetic field was developed. A comparison of these results showed a good agreement. Finally, the p-Q characteristics of the pump have been experimentally obtained on the new sodium loop built in the Alkali metals laboratory of the Institute of Physics of the University of Latvia (LUFI), as well as a comparison with the calculation of pressure/flowrate curves through numerical simulation data.