The design of the pump type SXB50 x 2-280 type pairs of power fire pump unit design ，The design theory is concentric bowl pump design theory.
Because of this pump is used for fire protection design of the cause of the fire pump，So this design continue on previous design concept and methods，try to reduce the overall size，type of structure is more compact.
The design of concentric bowl design,the main impeller blade hydraulic structure design , the design of hydraulic structure design,the design of hydraulic volute chamber, volute chamber structure design, the design of hydraulic radial diffuser ,radial diffuser structure design，middle structure design，balance the structure design of the dish,etc.
Main design concept, innovation. These instructions from hydraulic design, structural design, calculation, this design concretely explain and reasoning.
Keywords:Pairs of power fire pump unit , Concentric bowl pump design，Hydraulic design,Structure design， Radial diffuser, Balance set