LOW TEMPERATURE LIQUID STORAGE TANK OF THE INTERNAL HEAT INSULATING TYPE HAVING LEAKAGE DETECTING MEANS

摘要

A low temperature liquid storage tank of the internal heat insulating type having leakage detecting means in which a liquid impermeable layer is provided on the inner surface of the tank shell with a heat insulating layer being interposed therebetween and a secondary barrier is provided in the interior of the heat insulating layer. A layer of gas permeable sheet material is located at the side of the heat insulating layer interior of the second barrier. The layer of the gas permeable sheet material is divided into a plurality of compartments through each of which circulating gas can be selectively introduced and lead to gas analyzing means so that the leakage, if occurs, can be detected by analyzing the gas.