Accidents at oil and gas facilities are among the main causes of environmental pollution and loss of life. In the interests of solving the problem of ensuring the safety of oil and gas facilities, a review of the state of oil and gas facilities in the republic of Yemen was carried out, statistical data on accidents were analyzed, Defined the events that cause a fire in hazardous situations and build scenarios for the occurrence and development of fires through the study of an accident in the Aden refinery, also assessment of the mass of flammable substances entering the surrounding space as a result of fire hazardous situations, construction of fields of hazardous factors of fire for various scenarios of its development, assessment of the consequences of exposure to hazardous fire factors on people, and a base was developed for risk assessment and management. © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (https://creativecommons.org/licenses/by/4.0/).