A Study on the Simplified Estimating Method of Off-site Consequence Analysis for Aqueous Ammonia

Abstract

Aqueous ammonia is widely used in household cleaners, fertilizers and denitrification process. It is usually treated in concentrations from 10 % to 30 %, and release accidents have occurred frequently. In this study, we developed a simplified estimating method and equation to calculate threat zone easily in case of emergency due to release accident of aqueous ammonia. We calculated the consequence distance for toxic endpoints of aqueous ammonia(concentration 10 %~30 %) at different puddle areas(1 m 2~5 00 m2 ) using the ALOHA program. Based on the result, we analyzed the relationship between concentration and puddle area with the threat zone and created the equation.

Alternative Risk Assessment for Dangerous Chemicals in South Korea Regulation: Comparing Three Modeling Programs

“…The capacity of the tank was set to 10 m 3 , but assumed to be at approximately 80% capacity (8 m 3 ), as tanks are rarely used in processing when entirely full. The endpoint concentration to be used in the damage radius estimation for each chemical substance was calculated by the Emergency Response Planning Guideline (ERPG-2) value [ 15 ]. ERPG-2 is the maximum airborne concentration below which nearly all individuals could be exposed for up to 1 h without experiencing or developing irreversible or other serious health effects that could impair an individual’s ability to take protective action [ 16 ].…”

Priority Setting for the Management of Chemicals Using the Globally Harmonized System and Multivariate Analysis: Use of the Mahalanobis-Taguchi System

“…In Korea, chemicals that are considered highly likely to cause chemical accidents due to their hazardous nature, or which are likely to cause severe damage if an associated accident occurs, are designated as “chemicals requiring preparation for accident” and require an accident preparation plan to be devised under the Chemical Control Act, with the aim of preventing such damage from chemical accidents [5,6,7]. In this respect, the damage prediction modeling program provides preferential management of high-risk chemicals by predicting the extent of damage that would be caused by chemical accidents [8,9]. However, under the Chemical Control Act, fewer than 100 types of substances are controlled and designated as “chemicals requiring preparation for accident”, which is a very small number compared to the actual number of chemicals currently in use.…”