Environmental safety in case of accidents on the marine component of a multimodal pipeline system

For pipelines laid under water, the following fire factors are dangerous: thermal radiation when natural gas flares above the sea surface, excessive pressure and pressure wave momentum when a gas-air mixture is burned, as well as expanding combustion products when a gas-air mixture is flashed. Gorenje The features of gas condensate and monoethylene glycol are considered. Fire risks were assessed and a list of initial data for their calculations was compiled. The sequence of accident development is described. When building the event tree, the depth of the underwater pipeline placement is taken into account. During the risk analysis, four scenarios of natural gas coming to the surface were used. The value of the potential fire risk at a certain point of the pipeline route is determined. An assessment of the impact of damaging factors in accidents on the hose cable and on the pipeline was performed. Unstable dynamic phenomena accompanying an accident on an offshore pipeline are considered: during the initial period of impact of a shock wave, the release of water on the ship's deck and a fire-dangerous air plume above the sea surface.