ABSTRACT
In this chapter, we introduce the concept of pressure in a liquid and how it is measured. The liquid flow velocity in a pipe, types of flow, and the importance of the Reynolds number will be discussed. For different flow regimes, such as laminar, critical, or turbulent, methods will be discussed as to how to calculate the pressure drop due to friction. Several popular formulas such as the Colebrook-White and Hazen-Williams equations will be presented and compared. Also we will cover minor pressure losses in piping such as those due to fittings and valves, and those resulting from pipe enlargements and contractions. We will also explore drag reduction as a means of reducing energy loss in pipe flow.
