What is the term for the pressure on the intake passageway of the pump at the gauge attachment point?

The term for the pressure on the intake passageway of the pump at the gauge attachment point is indeed referred to as intake pressure. This measurement is critical in understanding the operational capabilities of a pump, particularly in ensuring that it can draw water efficiently into the system. Intake pressure reflects the atmospheric pressure acting on the surface of the water source and the resistance encountered in the intake line. It is vital for the pump to have adequate intake pressure to prevent issues such as cavitation, where vapor bubbles form and potentially cause damage to the pump.

In this context, while discharge pressure is important for understanding the pressure at which water is expelled from the pump, and net pump pressure combines both suction and discharge pressures to assess overall pump performance, they do not specifically describe the pressure in the intake passageway. Suction pressure, while closely related, typically describes the pressure available to lift water into the pump but may not be at the gauge attachment point. Therefore, the terminology aligns best with intake pressure as it directly correlates to the pressure being measured at the intake.