Russia has a large network of oil and gas pipelines that supply hydrocarbons to the Russian economy, parts of Europe, Turkey, and Southeast Asia. The length of the main pipelines in Russia is more than 250 thousand km, including gas pipelines — 175 thousand km, oil pipelines — 55 thousand km and oil product pipelines — 20 thousand km. During operation of the field pipelines, one of the main duties of the maintenance personnel is to monitor the condition of the pipeline route, pipeline elements and their parts located on the surface of the earth, as well as maintenance of the compressor and gas distribution stations. Given that about 46 % of the territory of Russia is covered by the forests, some of these objects are located on the territory of the woodlands. These are the objects discussed in the article. Employees who maintain such hazardous production facilities have an increased occupational risk due to the possibility of a forest fire occurrence. There are about 400 thousand forest fires around the world every year. According to the Federal Forestry Agency, more than 18 thousand forest fires occur in Russia every year. Due to the large number of remote hazardous production facilities that require periodic maintenance, the task of protecting personnel and managing occupational fire risk at such facilities is up to date.
The risk can be represented as the product probability of hazardous production facilities location in the forest area on the probability of a forest fire occurrence in this area. The occupational risk will increase depending on the type of fire hazard. The increase in occupational risk will be influenced by the occurrence of that or other event in the conditions of the situation consisting of four stages — origin, initiation, culmination, and localization.
The paper presents a network diagram of possible variations in the development of a forest fire of a forest area where a hazardous production facility is located, thanks to which more detailed models can be built to assess the occupational fire risk of the personnel.