Risk Assessment of the Leakage and Explosion of Natural Gas Pipeline and Impact Assessmant by Aloha Program

Abstract

In the following case study, to investigate the cause and assess the risk of natural gas pipeline leaks and explosions in Northeast of Thailand. The Fault Tree Analysis (FTA) was utilized to determine the root cause and utilized the ALOHA program to simulate leaking. The results of the case study found that the most causes of gas pipe leak are bringing heavy machinery into the pipes and made them spoiled. The chemical was filled into the pipes internally and got damaged. Moreover, the pipes were caused by aging externally. When the impacts of leaks and explosions were simulated, it was discovered that a 16-inch hole in the pipe would result in the most severe effect and cause Flammable Vapor Cloud. There is a methane report with a full strong value of 30,000 ppm with radius 1300 meters and capable of initiating and detonating Jet Fires. Its heat energy value per square meter is 10 kilowatts. The radiant heat radiation radius from the source is 97 meters, and the danger level of the effects of natural gas pipeline leakage and explosion was rated as medium. The risk assessment results can be used to prepare for emergency cases that may happen, such as: resourcing preparation or even knowledge training to the related employees. The findings from the analysis of the severity of the impact can be utilized to design an emergency response plan during and after the disaster, as well as implement the plan into practice. This collaboration between enterprises, communities, and relevant local authorities can lead to effective emergency prevention and response.