The centrifugal pumps for liquefied gases have achieved a longer operating life with their unique structure (vertical liquid-gas dual compartment structure). The pump consists of a motor part and a pump part separated into upper and lower compartments, respectively. Although the lower pump part is filled with liquefied gas while the upper motor part is an ambient temperature gaseous atmosphere, these two compartments are in an integral sealless structure with no shaft sealing being used. Therefore, there is no risk of leaking through shaft sealing, as well as a realizing of a longer operating life, free of maintenance, and low noise.