What is the term used to describe the measurement of system pressure when there is no flow of water?

The term that describes the measurement of system pressure when there is no flow of water is static pressure. Static pressure is a crucial concept in standpipe systems because it reflects the potential pressure available in the system when it is at rest. This measurement is important for assessing the system's capability to deliver water and is typically taken in the absence of any water flow.

Understanding static pressure helps in ensuring that the system can deliver the necessary pressure to fight fires when needed. It serves as a baseline for evaluating system performance and determining the adequacy of the water supply.

Dynamic pressure, on the other hand, refers to the pressure in the system when water is flowing, while residual pressure is the pressure remaining in a system during flow conditions. Flow pressure describes the pressure measurement during active water discharge and does not apply when there is no flow. Therefore, static pressure is the correct term to use in this context.