We will need to relate many times Pipe Size vs. Fluid’s Velocity. Don’t forget this concept since many times you will think you need more data, when in reality you have everything to solve it!

Using the Continuity Equation will also help you relate Diameter:Diameter ratios and Velocity:Velocity ratios.

The basis is a mass balance, then a volumetric flow balance. Eventually getting:

A1*V1 = A2*V2

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