HIPPS (High Integrity Pressure Protection System), is a Safety Instrumented System (SIS).
The primary function of a HIPPS is to protect personnel and downstream equipment against an overpressure scenario or an upset condition coming from the upstream pressure source.

HIPPS also helps to protect the environment by limiting the need to flare bypass or pressure regulator relieved gas or other product.
To mitigate the risk of this overpressure scenario, the HIPPS system uses inputs from pressure sensors to detect and demand closed, a dedicated set of valves, thus preventing further downstream pressurization.