I need to select a suitable diameter for my pipes

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SUMMARY

The discussion centers on selecting suitable pipe diameters for a pipe network system using the Hardy Cross method. Key considerations include optimizing for cost and volume while managing pressure loss and fluid velocity, which can be analyzed using Moody's diagram and the Hagen-Poiseuille equation. The recommended velocity for gas flow is approximately 7 ft/s to ensure efficiency. Participants also clarify misconceptions regarding the properties of helium gas, emphasizing its behavior under high temperatures and pressures.

PREREQUISITES
  • Understanding of the Hardy Cross method for solving linear equations
  • Familiarity with Moody's diagram for pressure loss calculations
  • Knowledge of the Hagen-Poiseuille equation for fluid dynamics
  • Basic principles of gas behavior, particularly for helium at high temperatures
NEXT STEPS
  • Research the Hardy Cross method in detail for iterative calculations
  • Study Moody's diagram to understand pressure loss in pipe systems
  • Learn about the Hagen-Poiseuille equation and its applications in fluid mechanics
  • Investigate the thermodynamic properties of helium gas under varying conditions
USEFUL FOR

Engineers and designers involved in fluid dynamics, particularly those working on pipe network systems, as well as anyone interested in optimizing gas flow and understanding the properties of gases like helium.

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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