Fitting Headloss 1

[Lan123]

I usually use the headloss coefficient to calculate the headloss through water pipeline fittings. But is there an equation that can be used with the Hazen William coefficient to calculate the fitting losses.

 

[ione]

I suggest you to give a read to:

1)

http://www.cheresources.com/eqlength.shtml

2)

http://www.eng-tips.com/viewthread.cfm?qid=173164

If you could have access to the publications referenced, you then have a more complete vision of the whole matter

? Crane Co., “Flow of Fluids through Valves, Fittings and Pipe”, Crane Technical Paper No. 410, New York, 1991.
? Hooper, W. B., The Two-K Method Predicts Head Losses in Pipe Fittings, Chem. Eng., p. 97-100, August 24, 1981.
? Darby, R., Correlate Pressure Drops through Fittings, Chem. Eng., p. 101-104, July, 1999.

 

[rconner]

Looks like the minutiae of this has been pretty well beat to death (see also

http://eng-tips.com/viewthread.cfm?qid=212974).

 

[BigInch]

I certainly agree.

"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.

"Being GREEN isn't easy." Kermit

http://www.youtube.com/watch?v=hpiIWMWWVco

http://virtualpipeline.spaces.live.com

 

[katmar]

If you use Hooper, Darby, or any of the methods based on the k factor as in [Δ]P = k.V²/2 then you would have to calculate the pressure drop for the fittings separately from the straight pipe because the Hazen Williams equation is usually cast in a form that gives you a pressure drop per unit length.

It would be better/easier to use a method where the resistance of the fitting is given in terms of an equivalent length of straight pipe. Once H-W has given you the pressure drop per unit length, then simply multiplying by the total equivalent length of pipe plus fittings would give the total pressure drop.

However, I would recommend rather using the Darcy Weisbach equation with Hooper/Darby k values. But sometimes contracts mandate the use of H-W and you have no choice. Even then, I would check my answers with D-W.

Katmar Software
Engineering & Risk Analysis Software

http://katmarsoftware.com