Hydraulics and Fluid Mechanics in ME
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Not possible
Designing new impeller
Some other alterations in the impeller
Trimming the impeller size to the required size by machining

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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

lowest pressure intensity occurs at front stagnation point
total drag is zero
lowest pressure intensity occurs at rear stagnation point
highest intensity of pressure occurs around the circumference at right angles to flow

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