When is the most accurate time for the MPO to record the static pressure?

The most accurate time for the Mobile Pump Operator (MPO) to record the static pressure is after a positive water supply has been established but before any lines are flowing. At this point, the system is stabilized, and the pressure reading accurately reflects the pressure available in the system without the influence of flowing water, which can change the pressure readings significantly.

Recording the static pressure before any lines are flowing ensures that the reading is not affected by drawdown or other factors that can alter the pressure when water is actively being drawn from the system. This provides a baseline measurement that is critical for later calculations and assessments during fireground operations.

Understanding this timing is essential for effective pump operations, as it aids in determining the available pressure for firefighting and helps ensure that adequate water supply and pressure can be maintained throughout the operation.