Influence of the Inherent Safety Principles on Quantitative Risk in Process Industry: Application of Genetic Algorithm Process Optimization (GAPO)

Table 4

Identified scenarios for consequence modeling extracted from HAZOP study in the studied methane recovery unit.

Scenario	Composition	Description	Leak size (mm)	Frequency (occurrence/year)	Phase to release	Outcome consequence
Sc01-T01-S	Composition from Table 1	Small leak of demethanizer tower	25	1.38E − 0.03	Gas	Jet fire; flash fire; vapor cloud
Sc02-T01-M	Composition from Table 1	Medium leak of demethanizer tower	100	5.4E − 5	Gas	Jet fire; flash fire; vapor cloud
Sc03-T01-CR	Composition from Table 1	Large leak of demethanizer tower	609	4.8E − 5	Gas	Jet fire; flash fire; vapor cloud
Sc04-D32-S	C3H8 (propane)	Small leak of MP REFR circulation drum	25	1.38E − 0.03	Liquid	Jet fire; flash fire; vapor cloud
Sc05-D32-M	C3H8 (propane)	Medium leak of MP REFR circulation drum	100	5.4E − 5	Liquid	Jet fire; flash fire; pool fire; vapor cloud
Sc06-D32-CR	C3H8 (propane)	Large leak of MP REFR circulation drum	609	4.8E − 5	Liquid	Fireball; flash fire; vapor cloud; jet fire; pool fire
Sc07-D31-S	Composition from Table 1	Small leak of feed HP separator	25	1.38E − 0.03	2 phase	Jet fire; flash fire; vapor cloud
Sc08-D31-M	Composition from Table 1	Medium leak of feed HP separator	100	5.4E − 5	2 phase	Jet fire; flash fire; vapor cloud
Sc09-D31-CR	Composition from Table 1	Large leak of feed HP separator	609	4.8E − 5	2 phase	Jet fire; fireball; flash fire; vapor cloud
Sc010-D33-S	C3H8 (propane)	Small leak of LP REFR. Circulation drum	25	1.38E − 0.03	Liquid	Jet fire; flash fire; pool fire; vapor cloud
Sc011-D33-M	C3H8 (propane)	Medium leak of LP REFR. Circulation drum	100	5.4E − 5	Liquid	Jet fire; flash fire; pool fire; vapor cloud
Sc012-D33-CR	C3H8 (propane)	Large leak of LP REFR. Circulation drum	609	4.8E − 5	Liquid	Jet fire; flash fire; pool fire; vapor cloud