孔板流量計的管道安裝條件：（1） 節流件前后的直管段必須是直的，不得有肉眼可見的彎曲。（2） 安裝節流件用得直管段應該是光滑的，如不光滑，流量系數應乘以粗糙度修正稀疏。（3） 為保證流體的流動在節流件前1D出形成充分發展的紊流速度分布，而且使這種分布成均勻的軸對稱形，所以1） 直管段必須是圓的，而且對節流件前2D范圍，其圓度要求其甚為嚴格，并且有一定的圓度指
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