This agent considers three storage tanks containing isobutylene, methyl chloride and ammonia respectively for simulation of atmospheric dispersion for tank gas leakage.
The dispersion profile is at 60 m with an emission source height of 5 m on Jurong Island, based on real-time weather data
(sourced from http://www.accuweather.com/en/sg/singapore/300597/current-weather/300597). The weather data is updated once every five minutes.
The emissions from tank leakage have been approximated using a leakage model that computes the mass flow rate of the gas compound through the hole in the tank.
It is assumed that the tank is a cylindrical pressurised storage tank with a leakage point located on the top of the tank.
The pressurised tank can only be filled up to 85% of its volume. The liquid chemical in the pressurised tank therefore forms a vapour phase above the liquid phase.
When a leak occurs at the top of the tank, the emission will be in vapour phase. The process is assumed to be an isentropic, reversible expansion of an ideal gas.
The mass flow rate of the emission is a function of the size of the hole, the density of the chemical and the exit velocity from the tank.
Upon clicking on the individual storage tank icon, a pop-up window containing the necessary input parameters to execute the simulation will appear
(storage tank’s temperature, pressure and leakage hole diameter).
The user can modify the value of the input parameters and execute the simulation to determine the corresponding dispersion profile.
J-Park Simulator: Atmospheric Dispersion Modelling System
Simulate material leakage from 5 m storage tanks on Jurong Island basing on real-time weather data
Click on the storage tank icons to modify inputs and start simulation
Weather data is sourced from http://www.accuweather.com/en/sg/singapore/300597/current-weather/300597