Horizontal radial split tube type structure, single suction, multi-stage impeller, center line installation, support at both ends. The balance drum structure balances the axial force, and the cylindrical cylinder and the pump cover are tightly sealed at the outlet section. When working, the sealing performance is good under the action of the high-pressure medium. When transporting high temperature media, the sealed enclosure can have a cooling water chamber. According to the need, the mechanical seal of different schemes can be configured, the seal at both ends only bears the inlet low pressure, and the sealed pipeline API standard is implemented.