A Stepwise Risk Assessment for Explosion Events considering Probability Distribution of Explosion Load Parameters

Table 1

Risk screening index considering safety function.

(I) Risk level		Description for consequence severity
A	Low	(i) No loss of production and damage to equipment; (ii) Negligible
B	Moderate	(i) Safety installation can cover most of the area; (ii) Minor damage to equipment and/or facility
C	Major	(i) Safety installation can cover some parts only, requiring significant preventive action; (ii) Serious loss of production
D	Critical	(i) Urgent remedial action required
(II) Risk level		Description for likelihood or frequency
1	Almost certain	(i) Expected to occur in most circumstances; (ii) Safety installation for only human living areas.
2	Likely	(i) Will probably occur in most circumstances; (ii) Safety installation covers the critical potential area of the FPSO structure
3	Possible	(i) Must occur at some time; (ii) Safety installation covers most of the area of the FPSO structure
4	Unlikely	(i) May occur at some time; (ii) Requiring a medium level of maintenance and intervention
5	Rare	(i) May occur, but only under exceptional circumstances; (ii) Requiring a high level of maintenance and intervention