Natural gas distribution system: A statistical analysis of accidents data

Natural Gas (NG) distribution is obtained by a really complex system that must ensure safe conditions and avoid human or economic losses. This paper analyzes accidents that occurred between 2004 and 2015 in the United States distribution systems and were recorded in the Pipeline and Hazardous Material Safety Administration (PHMSA) database. Statistical trends are studied; number of accidents, injuries and fatalities are shown and risk indexes are proposed for different accident causes. An average value of 2.09 x 10(-5) accidents/km are found in US distribution systems and it is shown that natural events pose the highest risk to distribution systems. Working conditions, such as pressure, pipe diameter and system age are considered in the study, finding that the low pressure and diameter systems account for the greatest number of injuries and fatalities in the case of failure. On the basis of the results, recommendations are given to sector stakeholders.