Find the Formula for Diameter of 3 Pipes

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The discussion focuses on finding a formula to calculate the diameter of the third pipe (d3) based on the diameters of two other pipes, using principles of momentum and forces. The user mentions a specific formula involving δ[adm] = 2%(l1+l2+l3), indicating that the maximum allowable refraction is 2%. They seek a straightforward equation that can be implemented in Excel for easy calculations. The user has not found relevant formulas in their textbooks and is looking for clarification or assistance in deriving the necessary formula. The goal is to establish a relationship between the diameters of the pipes to facilitate calculations.
emutudeng
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Homework Statement



My vocabulary is pretty bad in specialized English, so I have to post a picture of problem

There are three pipes, the cross-section changes and all measures are illustrative, I need to find an easy formula to find the diameter of d3, so I can create formula in Excel and by changing numbers it calculates the answer.

δ[adm]=2%(l1+l2+l3)


Homework Equations



Formulas are from topic of momentum and forces,
Maybe this helps
δ= M/W ⩽ δ[adm]

The Attempt at a Solution



It should become something like ω/M max * some coefficients, but I haven't found anything form books.
 

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δ[adm]=2%(l1+l2+l3)
Perhaps if you were to explain in words what this formula is about, someone might recognize what you are trying to do.
 
It means that the max refraction is 2%. The point is to find diameter of the upper pipe. It depends of the two others.
 

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