重力自流管径計算
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高低差3m、流量450m3/h、管長14メートル、管径は？
重力による自然流速は、一般的に0.2～0.5m/sとされる
具体的な媒体が不明なため、ティンハイの版主が示した流速に基づき0.5m/sとして計算し、配管の抵抗は無視する（配管が短いため）。その結果、管径は約DN600となる
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