Damage areas during emergency depressurization of a gas pipeline

Abstract

Main gas pipelines are classified as energetically stressed objects. With an increase in their service life, there appears a need to model emergency breaks and analyze the distribution of the damaging factors of the accident. The main gas pipelines often run near residential areas and cross various communications, therefore possible accidents with gas emissions and damaging factors can negatively affect both the environment and the population. An emergency rupture of a gas pipeline section is numerically modeled in this article. The calculations of intensity of accidental gas emissions outflow and distribution of the accident damaging (the length of the methane jet in unlimited airspace, the range and height of the scattering of the soil and pipe fragments were found). The parameters of free jets of exhaust gas were determined. Such calculation is required during investigation of accidents and development of documents related to the environmentally safe operation of pipeline transport. In case of gas non-ignition, it disperses in the atmosphere with the formation of gas zones. The study of the influence of velocity, density and pressure on the emergency gas emission allows us to determine possible gas contamination zones. Graphs of distribution of static and total pressure over the ejection height, distribution of velocities along the axis of the ejected jet and along the axis of the pipeline were obtained. The ability to evaluate the parameters of free jet flow of natural gas (methane) from a damaged pipeline: the total flow rate, total pressure and flow rate at the rupture point is relevant in solving applied environmental safety problems of gas transportation facilities.

Unignited high-pressure methane jet impacting a cylindrical obstacle: An assessment tool for consequences analysis

“…In the Oil & Gas (O&G) sector, the use of flammable substances stored and transported in gaseous form and under pressure conditions is quite common (Varsegova et al, 2019;Khraisheh et al, 2020;Zhang et al, 2020;Zhu et al, 2020). In the field of industrial safety, high-pressure (HP) releases of a flammable material impacting an obstacle are of paramount importance as possible accidental scenarios (Rian et al, 2016;Jang et al, 2016;Hall et al, 2017;Kotchourko et al, 2014).…”

Calculation of soil temperature at the intersection of the heating line of the underground gasket and gas pipeline taking into account real operating conditions

“…Studies [21][22] numerically simulate the temperature field of the soil and calculate the temperature field of the soil around the underground pipeline during oil transportation, analyze the safety limits required for the temperature of the external surface of insulation of pipelines with the flow of superheated steam.The authors [23] consider the boundaries of the potential thermal impact zone provided that there are external ignition sources in case of possible emergency depressurization of the gas pipeline. Since the issue of determining the soil temperature for underground pipelines was not considered in detail by the researchers, there is no detailed analysis of determining the soil temperature at the point of intersection of communications.…”