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["["工艺选泵是否只有最终核算实际仪表规格书的压PSH。
"泵"设计方面有两点不太清楚，还请高人为我指教： "在选泵设计时是否有阶段：第一阶段先估算孔板、调节阀等的NPSH，算出扬PSH，后面第二阶段等ISO图出来后再细算算，第三阶段等控制阀孔板等采购回来再核算实际NPSH。如果前期的泵粗算了选好买了，后面如孔板的NPSH很大，和和和PSH差别很大N扬扬程不满足了怎么办？是泵的计算程序出问题还是还是预估的经验问题？
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