A full-circumferential flow pump has a circumferential fluid passage between a pump casing and a motor provided in the pump casing. The full-circumferential flow pump comprises a suction-side casing (1) having a suction nozzle, and an outer cylinder connected to the suction-side casing and accommodating the canned motor therein. The suction-side casing (1) and the outer cylinder (9) have flanges (1a,9a), respectively extending radially outwardly from an open ends thereof. The adjacent flanges of the suction-side casing (1) and the outer cylinder (9) are clamped by clamping flanges (20A,20B) to connect the suction-side casing (1) and the outer cylinder (9). IMAGE
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