By Class 3, pressure management stops being about reading a gauge and starts being about designing and troubleshooting the system that produces that reading. This guide covers the technical toolkit a system operations role actually leans on: the hydraulic grade line as a planning concept, the difference between a gravity zone and one that needs a booster station, what actually goes wrong inside a PRV station, the real math behind a hydrant flow test, and the operational basics of water hammer — a transient event that can crack pipe and destroy equipment in a fraction of a second.
The Hydraulic Grade Line (HGL)
The hydraulic grade line represents the elevation to which water would rise in an open tube (a piezometer) connected to the pipe at a given point — in other words, it's a direct physical picture of the available pressure energy at that point, expressed as an elevation