You're reviewing a 20‑year‑old GA for an above‑ground LPG bullet and you Google "carbon steel brittle fracture risk propane rapid depressurization". The vessel is ASTM A516 Gr.70, no PWHT, Charpy data missing. During ESD blowdown, metal temperature is predicted to fall to −35 °C. What degradation or failure mechanism dominates the risk assessment?

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−20 °C is the usual minimum design metal temperature boundary for plain A516 without proven impact toughness. Dropping to −35 °C during rapid depressurisation shifts the failure mode from strength‑controlled to toughness‑controlled; corrosion mechanisms don’t act on that time scale.

LPG Fundamentals and More: A Journey to Expertise

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