Hazen-Williams formula

[Kristianx2]

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.

 

[IRstuff]

H is supposed to be "slope of the energy line" (head loss per length of pipe) from Wikipedia.

http://en.wikipedia.org/wiki/Hazen-Williams

TTFN

FAQ731-376

 

[Apakrat]

You might wanna check out the on line calculator at:

http://www.ajdesigner.com/phphazenwilliams/hazen_williams_fluids_equations_mean_velocity.php

At 74th year working on IR-One PhD from UHK - - -

 

[Artisi]

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

 

[BigInch]

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/

 

[Kristianx2]

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

 

[BigInch]

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/

 

[katmar]

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