Pressure Loss Calculation - Nitrogen. GPSA - Darcy Weisbach method. 6

[ABenggie]

Hello,

I need some help in determining why my calculated pressure drop is so high using the GPSA methodology vs results from a calculator such as free calc. In the attached I have a side by side comparison of the results between the 2 methodologies. It is peculiar because the calculated velocity using freecalc is higher than what I get yet their calculated pressure loss is orders of magnitude smaller. If anyone could advise on what the issue is that would be appreciated.

Thanks

 

[ABenggie]

Katmar thanks for bringing up that consideration. This is for designing a nitrogen control cabinet though whose purpose is to supply instrument gas to surge valves

 

[LittleInch]

Are you sure about that maximum flow rate?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[ABenggie]

The flow rate is the rated flow of the device which I found from the product literature.

 

[Latexman]

"Cabinet" usually means rectangular to me. Rectangular means flat panels, and flat panels do not hold much pressure, without massive reinforcement. I am curious how this all fits with a PSV set pressure of 203 psig. Can you share a PFD, P&ID, or sketch?

Good Luck,
Latexman