If the exhaust system is under a vacuum, the casing must be warmed by gradually introducing the steam, after opening the exhaust valve.
如果排气系统处于真空下，必须在打开排气阀后，逐渐引蒸汽来加热壳体。
By means of these expressions, formulas for calculating the axial and radial forces on the casing are derived and then the influence of steam flooding on casing strength is qualitatively analyzed.
根据这些表达式进一步推导套管轴向力和径向力的计算公式，然后根据这些公式定性地分析注蒸汽采油对套管强度的影响。
Back steam into the turbine and drain condensate from the casing.
蒸汽倒进汽轮机并从壳体排凝。
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