| 摘要 |
PROBLEM TO BE SOLVED: To automatically measure the content volume of a gas supply line and gas leak volume while using no personnel, without stopping the supply of gas. SOLUTION: Pressure P1 within the gas supply line 7 is measured just before a gas (a) for measurement with pressure slightly higher than a predetermined pressure to which another gas is adjusted is forced into the gas supply line 7 into which the latter gas is supplied, and the gas (a) for measurement is forced into the gas supply line at a constant flow rate (l/sec) for a period of t1 hour, after which the supply of the gas (a) for measurement is shut off while pressure P2 within the gas supply line 7 is measured. After a period of t2 hours has elapsed, the internal pressure P3 of the gas supply line 7 is measured, and the content volume V of the gas supply line 7 and the quantity of gas Q2 leaking from the gas supply line are computed on the basis of those data. Measurements are programmed while giving priority to time, but they can also be programmed while giving priority to pressures.
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