| 摘要 |
PURPOSE:To calculate the distance from a suction place to a leakage place of inactive gas by dividing the quantity of the inactive gas which is sucked by the time the oxygen density in the inactive gas starts to rise by a sectional area of the piping. CONSTITUTION:It is assumed that there is the gas leakage place at a point P in a gas conduit 1. In this case, since the point P is unknown, respective valves B-G of the branch pipes of the gas conduit 1 are opened and the inactive gas is sealed from a line 2 into the whole piping by opening a valve A. Further, the valves A-G are closed and a valve 3 is closed and the inactive gas or the like which is sealed from the inside of the piping is sucked by a pump 4 and at the same time, the quantity of suction and the oxygen density are continued to be measured by a flowmeter 7 and an oximeter 6 respectively. When the inactive gas is sucked, since air is sucked from the point P of the leakage place into the pipe in the section, it is soon detected by the oximeter 6. When the detection is started, the quantity of the inactive gas sucked hitherto is read by the flowmeter 7 and the quantity of suction is divided by the sectional area of the gas conduit 1. As a result, the distance to the point P is given.
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