Which of the following best describes Total Dynamic Head (TDH) of a pump?

Total Dynamic Head (TDH) is a crucial concept in understanding the performance of pumps in fluid systems. It represents the total energy that the pump must impart to the fluid to move it through the system. The correct relationship that defines TDH includes three key components: static height, static lift, and friction loss.

Static height refers to the vertical distance the water needs to be lifted, which is a factor of gravitational potential energy. Static lift is the elevation difference between the pump and the highest point in the system. Friction loss accounts for the energy lost due to the resistance the fluid encounters as it moves through pipes, fittings, and valves, which affects the overall efficiency of the system.

Thus, by correctly summing these components, one arrives at the total energy that must be supplied by the pump to achieve the desired flow, making this answer the best description of Total Dynamic Head for a pump. The other options do not accurately encapsulate the necessary elements to describe TDH effectively, leading to misrepresentation of how pumps function in relation to fluid dynamics.