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Hazen-Williams formula

Hazen-Williams formula

Hazen-Williams formula

(OP)
Q=4.03 x 10^-5 x D^2.65 x H^0.54

I would like to use this formula to size a water pipe (D). I have Q from flow requirements. How do I determine H? The pump is rated 50 m head. Distance of flow circa 1000 m.

RE: Hazen-Williams formula

What is the flow rate and can the pump produce the required flow rate at 50m head?

RE: Hazen-Williams formula

Carefull.  Online flow loss calculators only determine straight pipe flow loss.  You're talking about a system design with suction requirements, fittings, a valve or two and possibly some elevation change.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: Hazen-Williams formula

(OP)
Apakrat...thanks for the website. However, I still have two unknowns D & H (headloss). I need a way to calculate/estimate H.

RE: Hazen-Williams formula

You can start by assuming a pipe diameter that gives you a fluid velocity of 2 m/s.  

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: Hazen-Williams formula

If the pump is a centrifugal then you need to match the system and pump curves to see where they intersect.  Basically, you calculate the head for a range of flowrates (or vice versa) and plot the calculated points to make the system curve on the same diagram as the pump curve.

See http://www.engineeringtoolbox.com/pump-system-curves-d_635.html
 

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

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