| 摘要 |
<p>PURPOSE:To surely release N2 from a tank, by the purging method of the N2 from the tank after its cooling test whereby air is supplied while cool air is discharged to the atmosphere and a quantity of O2 is measured in the tank after it is tested. CONSTITUTION:A tank 1 provides in its inside a gas circulatng through hole 6 and an O2 measuring device 8. While the tank 1 is formed so as to release N2 gas in the tank to the atmosphere by opening a supply air pipe 10 to a roof 2 and providing a pipe 3 reaching a bottom part of the tank. The tank, after its cooling test is finished, replaces the N2 gas with air 11 by feeding the air 11 into the tank. Here a percentage of O2 gas is measured by the O2 measuring device 8. Consequently, the worker can safely enter the tank by preventing the N2 gas from accumulating in the upper of a deck.</p> |
