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管徑D=√[4流量D/(π經濟流速v)] 其中:管徑D組織為米,經濟流速v:對於DN300以下管選1.2m/s、DN300以上管選1.5m/s;流量組織為立方米/秒. 所以,管徑D=√[4x(200/3600)/(πx1.2)]=0.243(米)=243毫米.
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