| 摘要 |
PURPOSE: A leak detecting device for an LNG storage tank is provided to safely obtain inspection conditions of an inspection zone from pollution within an LNG storage tank due to helium gas leakage of a helium balloon by transferring a helium gas detecting probe to an object section to be inspected. CONSTITUTION: A leak detecting device for an LNG storage tank comprises a helium balloon, a helium gas detecting probe(12), a vacuum tube(4), a detector for helium gas, a rope coupling ring(8), and a position adjusting rope(7). The helium balloon has a double layered structure of helium gas(2) and air(3). The helium gas detecting probe sucks ambient air. The vacuum tube is connected to the helium gas detecting probe and the detector for the helium gas. The detector for the helium gas detects helium gas in the air. The rope coupling rings are attached on the outer circumference of an outer balloon(1b).
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