Currently,in the field of assessment of failure consequence,the calculation accuracy of impact area of fireball's thermal radiation is limited by some ungrounded assumptions to some extent.

The severity of the failure consequences about the buried gas pipeline in a city have been evaluated by fuzzy comprehensive assessment.

The illustration shows that the fuzzy comprehensive evaluation method is practical and effective,and can be widely used in the failure consequence assessment of petrol chemical equipment.

Specific contents include the identification of serviceability limit state and ultimate limit state, description of long-term random waves, investigations of breakwater failure modes, failure probability calculations for single failure mode and the whole breakwater system, quantification of failure sequent, cost-.

Quantitative risk evaluation of risk based inspection from the likelihood of failure and the consequence of failure for two constitute of equipment risk were introduced.