Calculation of the power of an axial flow pump,

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Question: Regarding the high-flow axial flow pumps used in forced circulation systems, I have a question regarding the calculation of power. The formula I used is P=Q/3600*9.8*H/N, where Q represents the flow rate in T/H； H is the head in M, and N is the efficiency. But why is the calculated value different from that of the selected option in the plan? Seeking advice! ! ! 1. A pump with a capacity of ~900 t/h, a head of 4 m, and a power rating of 30 kW is used as the forced circulation pump. (I calculated it as: 900/3600*9.8*4/0.65=15KW; multiplying by 1.15 gives an installed power of only 17.3KW, which is far too low.) What’s the problem? The following is similar as well! ) 2. An axial flow pump with a capacity of 3500 m3/h, a height of 3.5 m, and a power rating of 90 kW is used as the forced circulation pump. 3. A pump with a capacity of ~450 t/h, a head of 4 m, and a power rating of 22 kW is also used as the forced circulation pump. In all these cases, it’s not possible to determine approximate values; I would appreciate everyone’s advice!