How does a horiziontal flanged pump produce pressure
Fluid particles enter the pump at the suction flange or connection. They then turn 90 degrees into the plane of the impeller and fill up the volume between each impeller vane. A horizontal pump is a device whose purpose is to produce pressure by accelerating fluid particles to a high velocity providing them with velocity energy. What is velocity energy? It's a way to express how the velocity of objects can affect other objects, you for example. Have you ever been tackled in a football match? The velocity at which the other player comes at you determines how hard you are hit. The mass of the player is also an important factor. The combination of mass and velocity produces velocity energy. Another example is catching a hard baseball pitch, ouch, there can be allot of velocity in a small fast moving baseball. Fluid particles that move at high speed have velocity energy, just put your hand on the open end of a garden hose.
The fluid particles in the pump are expelled from the tips of the impeller vanes at high velocity, they then hit the inner casing of the pump and are decelerated lowering the velocity energy and raising the pressure energy. Unlike friction that wastes energy, the decrease in velocity energy serves to increase pressure energy; this is the principal of energy conservation in action. The same thing happens to a cyclist that starts at the top of a hill, his speed gradually increases as he looses elevation. The cyclist's elevation energy is transformed into velocity energy; in the pump's case the velocity energy is transformed into pressure energy.