Pressure loss, due to the viscosity of liquids and the inevitable presence of frictional forces when flowing in pipelines, results in the loss of some energy during the flow of liquids. This part of energy loss is mainly manifested as pressure loss.
There are two types of pressure loss: along the way loss and local loss. Along the way loss is the pressure loss caused by friction when a liquid flows over a certain distance in a straight pipe with a constant diameter. Local loss is a pressure loss caused by sudden changes in the cross-sectional shape of the pipeline, changes in the direction of fluid flow, or other forms of fluid flow resistance. The total pressure loss is equal to the sum of the loss along the path and the local loss. Due to the inevitable existence of pressure loss, the rated pressure of the pump should be slightly higher than the working pressure required by the system during operation. Generally, the working pressure required by the system during operation can be estimated by multiplying it by a coefficient of 1.3-1.5.
