GB/T 40497-2021Evaluation principles for the design of offshore facilities against fire and blast loading (English PDF)

2.1 Offshore facilities

All kinds of fixed or floating buildings, installations and fixed platforms operating in the ocean, water and underwater.

2.2 Hazard and operability analysis

According to scientific procedures and methods, from a systematic perspective, pre-identify and identify potential hazards in engineering projects or production devices. Analysis and evaluation.

3.1 Principles for the classification of assessment grades

Before designing, it is necessary to evaluate the risk level of offshore installations, which are usually divided into three levels, namely.

---Preliminary screening and evaluation. Screening of unmanned, stationary equipment and facilities with low risk, and routine inspection and evaluation;

---Theoretical load evaluation. conduct an evaluation under general load for offshore installations that can meet the normal working load requirements;

--- Accident-induced load assessment. Assessment of accidental fire and explosion loads that may occur during the working life cycle of offshore installations.

3.2 Principles for the classification of accidents

Through the type of operation and operating environment of offshore installations, as well as the possible fire and explosion loads, depending on the degree of harm, the Fire and explosion accidents are divided into three levels, namely.

---Low risk. basically no fire and explosion will occur, and the degree of harm is controllable, and the impact is small;

---Medium risk. The probability of fire and explosion is low, but the impact is greater;

---High risk. Once a fire and explosion occur, the consequences are more serious.

3.3 Principles for judging accident levels

In addition to considering the magnitude of the hazard of fire and explosion accidents, the possibility of the occurrence of fire and explosion accidents should also be considered.

The level of the accident is judged by its probability of occurrence and the magnitude of its impact, see Table 1 for details.