Environmental risk assessment of city natural gas projects

Combining the operational circumstances of the natural gas projects in four big cities in Guangdong,i.e.Guangzhou,Shenzhen,Dongguan and Foshan,the present paper makes an introduction and detailed discussions to the environmental risk assessment on the city natural gas projects.In addition,it also introduces the prediction modes of hot radiation and explosion blast wave by Moorhowse and Prichard to heighten the assessment quality.The results show that,if the natural gas leaks and causes a fire,which is supposed to last 10 minutes,the biggest radius(grade A)of the fireball of city gas gate stations,pressure regulating stations and gas delivery pipelines would suffer serious human casualty and material loss respectively in 35.8 m,18.0 m and 28.7 m areas.The biggest radius(grade C-1)of the explosion waves will be respectively 54.8 m,27.8 m and 44.4 m.In conclusion,some suggestions and countermeasures for accidental risk prevention are brought about for the site selection of city gate stations,pressure regulating stations and gas delivery pipelines,the guard against of safety distance,the risk control and management during the operation,as well as the emergency counter-planning.