Calculating the head loss occurring in the piping lines of a centrifugal pump is a very complex and challenging task. However, the actual head loss in the piping system can be surprisingly significant, so it must be carefully considered.
The calculation methods for head loss include the Darcy equation, Moody chart, Colebrook equation, and Blasius equation, which allow for approximate calculations; however, there may be slight discrepancies with actual values. The chart below is based on these equations, with values adjusted using empirical data.
The graph below was created by applying empirical corrections to the values calculated based on these formulas.
<See the table below>
When selecting a pump, the total head loss obtained from the chart below is added to the actual head to determine the total head. Then, the intersection point of the total head with the pump performance curve can be found to calculate the actual discharge.
However, these values may vary somewhat depending on factors such as the type of oil, viscosity, temperature, surface roughness of the pipe, shape of the pipe, and type of valve.
Head Loss per Meter of Piping
Head Loss at Outlet and El-bows