安全弁による低圧化システムの圧力制御対策(I) : 自動減圧弁を単独設置した場合

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タイトル別名
  • Pressure Countermeasure Control on Pressure-reducing Pipeline System Using Safety Valve (I) : A Case of Single Installation of Automatic Control Valve
  • 安全弁による低圧化システムの圧力制御対策(1)自動減圧弁を単独設置した場合
  • アンゼンベン ニ ヨル テイアツカ システム ノ アツリョク セイギョ タイサク 1 ジドウ ゲンアツベン オ タンドク セッチ シタ バアイ

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An on-site experiment concerning pressure reduction in a pipeline system was conducted using a test pipeline located in Ohno Mountain in Kagoshima Prefecture. A conventional and a new type of automatic control valve were installed in the pipeline independently and in combination with a safety valve; and a comparative study of the pressure control behavior was conducted under four experimental conditions. The results were as follows: (1) The use of the conventional control valve caused pressures on both of its downstream and upstream sides when the terminal valve was briefly operated, inevitably causing a large increase in pressure which affected the entire system. (2) With the conventional control valve, it was necessary to use the safety valve to block the upsurge of the upstream and downstream pressures; and to control and set the pressure on the downstream side. Therefore, the performance of the pressure-reducing system depends entirely on the safety valve. (3) The new type of control valve is sensitive to increases in downstream-side pressure caused by closing the terminal valve. It fully closes in response to such increases, enabling the suppression of increases in downstream-side pressure. (4) Moreover, the new type of control valve closes quickly when the terminal valve is closed abruptly. This, in turn, causes a pressure increase on the upstream side of the control valve. Thus, it is necessary to have a safety valve fitted on the upstream side of the new type of control valve.

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