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Gas Dispersion Analysis (GDA)

Gas dispersion analysis (GDA) is detail calculation and prediction of worst case scenario involving toxic and/or flammable gas leaked from the pressurized system to the environment. Two major categories of gas leak such as plump and puff are considered. The impacted areas mainly in down-wind direction will be determined and the acceptable limit of toxic concentration will be setup. In facility, GPA is used to determine the location and number of fire and gas detector, or gas sensor to trigger the installed alarms or other safety devices, in case of accidental gas release before endanger the employee or public areas. During the analysis, in order to be more accurate,  modeling and simulation using finite element method (computerized fluid dynamics - CFD) is commonly utilized and map or contour of areas affected are generated.




Benefit of GDA

a. It can eliminate and decrease the HSE occurence. 

b. It can identify the safe area with respect to toxic gas release (downwind direction). 

c. It can identify possible fire and explossive gas dispersion (downwind direction). 

d. It can identify the safe area with respect to toxic and/or explossive gas dispersion. 

e. It increases safety of people and asset and  improve risk management.