Loss of Containment

Corroded Pipe Rupture — Sudden Large Release

The wall had been thinning for years. It let go all at once.

What happened

A pipe carrying hot hydrocarbon has been quietly thinning from corrosion and ruptures without warning, dumping a large flammable volume — often above auto-ignition temperature — into the open. A vapour cloud forms in seconds with workers inside it.

Why it matters

Chevron Richmond 2012 proved the wall thinning was inspectable and predictable — the failure was a mechanical-integrity/inspection gap, not bad luck. Trainees must learn both halves: act on marginal condition flags before failure, and respond correctly when the pipe lets go anyway.

Control sequence

(Field/what-if) Act on the marginal/overdue thickness flag — take the line out of service before failure.
On rupture: get people out of the line of fire immediately.
Activate ESD / remote isolation to cut the source feed.
Confirm blowdown/depressuring of the ruptured segment.
Escalate and keep ignition sources controlled before the pre-set ignition point.

How often

Piping LOPC is a steady global occurrence: IOGP members reported 193 Tier 1 LOPC events in 2021 (rate 0.12 per million work hours) (IOGP PSE 2021 data), and US EPA RMP facilities reported 3,236 chemical accidents 2004–2019 — an average of ~202 per year (EPA…

Consequences

Chevron Richmond 2012: 19 workers narrowly escaped the cloud; ~15,000 nearby residents sought medical evaluation after the fire (CSB). PES Philadelphia 2019: corroded elbow rupture → vapour cloud → explosions, vessel fragments thrown across a river (CSB).

Evidence gate: publish only after verification

Richmond: 8-inch #4 sidecut line ruptured from sulfidation corrosion of low-silicon carbon steel (CSB, csb.gov/chevron-richmond-refinery-fire/).cited
~15,000 residents sought medical evaluation post-Richmond (CSB).cited

ExperienceLearn it, live it

Coming soon

EON Life Simulation

Walk into the accident and practise freely, no score. The physics decides, unscripted.