<技術報告>地上火災時における地下タンクの安全性

概要

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This paper describes the security of an underground steel room in the case of a fire on the ground. The underground room tested is cylindrical form and its dimensions are 2 m in diameter, 2m in height and the wall thickness is 3.2mm. The structure built of wood over the ground is two storied and the floor area is 16m2. After filling up 5 ton of wood, a fire was caused. From the experimental results and the theoretical analyses, the following conclusive remarks were drawn. (1)Although the grade of fire was the highest class and the scale of it was appropriate, the increase in the temperature inside the underground room was only 2 degrees. (2)The density of CO gas in the room was 1/500 of the fatal dose, and that of CO2 was 1/100. (3)Most part of the heat transfer was conducted through the entrance of the underground room. (4)When the soil of 0.5 m height covers the upper side of the room, the room is regarded to be secure more than 10 hours from the viewpoint of temperature. (5)When the outerside wall is covered with 3 pieces of the firebrick, its insidewall is freedom from danger for 10 hours.
長岡技術科学大学の論文
1984-01-31