What does static pressure refer to in a fire suppression system?

Static pressure is defined as the pressure present in a fire suppression system when water is not moving, meaning there is no flow through the pipes or nozzles. This measurement is crucial because it provides insight into the potential pressure available to deliver water efficiently when the system is activated. Understanding static pressure is essential for ensuring that there are adequate pressure levels available for proper operation of fire suppression systems before they are engaged during an emergency. In contrast, when water flows, the pressure measurements change and reflect dynamic conditions influenced by factors such as friction loss and hose length.