Pipeline leak response event tree

A pipeline leak event tree follows a loss of containment through the safeguards that can limit its impact. Leak detection provides the first opportunity to respond, remote isolation can reduce the amount released, and ignition prevention separates a release from a fire outcome. The outcome rows intentionally stop when a scenario has already reached a final consequence. This makes the event tree easier to review and avoids suggesting that a later barrier can undo an earlier uncontrolled release. Operations, safety and integrity teams can use this drawing to agree on the sequence of barriers before assigning site-specific reliability data. It is a screening model, not a substitute for detailed hydraulic, dispersion or fire consequence calculations.