SIMULATION OF DISPERSION AND EMERGENCY RESPONSE PLAN FOR AMMONIA LEAKAGE USING ALOHA: A CASE STUDY OF A COLD STORAGE PLANT

Abstract

The purposes of this research were: 1) to determine the dispersion range and direction of ammonia leakage within the study area, and 2) to establish emergency response guidelines based on simulation results. The research instruments included ALOHA version 5.4.7 for hazard radius estimation, Google Earth version 7.3 for spatial impact analysis, and satisfaction questionnaires. The study employed a quantitative research methodology. The population consisted of 1,835 employees of Andaman Seafood Co., Ltd., with a sample size of 3 safety officers. Data were analyzed using descriptive statistics (percentage, mean) and Pair Simple T-Test. The results were as follows: 1. The maximum AEGL-3 (lethal concentration) radius for pipeline leakage was 84 meters, while tank leakage reached 699 meters. (Technical analysis confirms that the "kilometer" units mentioned in certain summary sections were clerical errors; based on source strength and ALOHA's mathematical constraints, the correct unit is "meters"). 2. The newly developed emergency response plan, incorporating ALOHA’s real-time wind data, consists of 12 procedures that prioritize avoiding plume dispersion zones. Knowledge assessments showed a significant increase in mean scores from pre-training (5.33) to post-training (7.33), with 100% satisfaction regarding the project quality.