What is two-phase flow design for condensate return lines?
As the name implies, condensate return lines are pipelines through which condensate flows. Flash steam often accompanies hot condensate, however, and in this case flash steam (gas phase) and condensate (liquid phase) are found mixed together inside the piping. Two-phase flow piping design takes into account this mixture of gas and liquid. As the specific volume of steam is 100’s to over 1,000 times that of condensate, condensate return piping is more like steam piping than water piping. However, consideration must be given to flow rates that prevent the occurrence of condensate-induced (liquid phase) water hammer.
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