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I have an application as follows:

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vanuta

Mechanical
Aug 1, 2009
15
I have an application as follows:

I have positive displacement pump 1 that is pumping at around 6 BPM ( through a 4" pipe) at pressure P1. There is another smaller positive displacement pump 2 that is pumping at around 0.8 BPM ( through a 1" pipe) at pressure P2. These 2 fluids mix at a point and are discharged to a open tank ( atmospheric pressure). I would like to know the pressure at the mixing point Pm. Is there any empirical formula that i can use to determine the pressure at point Pm? Any guidance is very much appreciated. see attached for clarity

 
 https://files.engineering.com/getfile.aspx?folder=44964d86-a7bf-4c81-8207-d1118e7e22b9&file=mixing_queries_1.JPG
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