Quantitative risk evaluation of crude distillation unit was introduced in this paper. As we known, risk is the production of the likelihood of failure and the consequence of failure according to API risk-based inspection method. First, corrosion thinning and stress corrosion cracking are distinguished as the failure modes of this crude distillation unit. Then, according to each failure modes’ limit state functions, the failure probability was calculated. Consequence of failure was compound of flammability, toxicity, and business interruption consequence. According to fluid properties and the total mass available for release, the consequence of failure was determined by fire and explosion models. Then according to quantitative risk matrix given in API581, the risk category of this crude distillation unit can be obtained, which is important to predict the residual life and extend inspection periods of the crude distillation unit.
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