I need to select a suitable diameter for my pipes

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To select suitable pipe diameters for a network using the Hardy Cross method, consider optimizing for cost and volume while managing pressure loss and fluid velocity. The Hagen-Poiseuille equation and Moody's diagram can help determine the relationships between these factors. A flow rate of 15,000 cubic meters requires assumptions about diameter selection, with a recommended velocity of around 7 ft/s for efficiency. It's important to note that helium gas does not solidify or liquefy under normal conditions, complicating its handling in piping systems. Proper sizing is crucial for effective gas flow management in the project.
Young.Eng.SA
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Hi guys,

Please help me out, I have a project here I need to design a pipe network system using Hardy Cross method.

I have drawn my pipe network and done my distribution of the flow rate according to the give discharge. but now I'm not sure which method I should use in selecting pipe sizes.

Pleasr help me out.

Regards
Young.Eng.SA
 
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What is it that you are trying to optimize? Cost, volume, efficiency, weight? The only fluids related parameters pipe size effects is the pressure loss (head) in the piping system and the fluid velocity. All these relationships can be found using Moody's diagram and models such as the Hagen-Poiseuille equation.

http://en.wikipedia.org/wiki/Hagen–Poiseuille_equation
 
Surely any reasonable size will do?

The Hardy Cross method is really an iterative method for solving a system of linear simultaneous equations.
 
Hi,

I was also thinking of considering Hardy Cross. But I'm only given a flow rate of 15000 cubic meters and I believe I have to make assumptions for the selection of diameters but again how far in assumptions should I get with the above flow rate?

Also can you guys tell me: what are the properties of helium gas at 900 degrees celcuis. I believe this is an inert gas that can be solidified at high pressures
 
Hi,

I'm looking on both volume and cost only
 
Young.Eng.SA said:
Hi,

...Also can you guys tell me: what are the properties of helium gas at 900 degrees celcuis. I believe this is an inert gas that can be solidified at high pressures

IIRC, that's incorrect. I don't even think there's a industrial use for liquid helium.

Helium does not solidify or liquefy outside of extreme lab environs. At least on earth.
 
You want to size the pipe so that your velocities are fairly low. If its something generic, size it to about 7 ft/s. Dealing with gas is a little more complicated as its compressible, really depends on how much volume you want at your outlet
 

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