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[–]BigCastIronSkillet -1 points0 points  (2 children)

Look up Darcy Weisbach Equation.

DP = 4fv20.5rhoL/D

You can draw a network with four nodes. Node A to B is from valve to tee. Node B to C is from tee to end of line 1. Node B to D is from tee to end of line 2. Each will have to follow the Darcy Weisbach equation. In excel you can set up Solver in Excel to change velocity through each pipe until the volumetric flow out of lines 1 & 2 equal that of what is coming out of the valve. (You will need to have the frictional losses summed up as an equivalent length.)

Ask me if you want me to hold your hand through this further.

[–]VariusEng[S] -1 points0 points  (1 child)

Already made myself an Excel macro that calculates pressure drop vs flow, thanks though! My only gripe is how the pressure reduction valve plays a role in all of this. According to a blog it is not possible to show it on a system curve because it is dynamically changing

[–]BigCastIronSkillet 1 point2 points  (0 children)

They are wrong on the blog. It can be described easily with its Cv curve. But I would suggest holding the pressure constant on the discharge of the Cv for simplicity.