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LPG friction losses, free flow

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RFZC

Mechanical
Jun 5, 2003
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Hi
How can I estimate the maximum flow in NPS 4" piping if we drain LPG from a pressure vessel to atmosphere using that piping?
Actually, I need to calculate the maximun thrust at the end of the piping.
I understand that if I use Bernoully, introducing friction losses, I can estimate the maximum flow.
But LPG changes from liquid to gas at some point in the piping.
I do not know how to introduce this condition to calculate the maximum flow
 
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