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calculating Friction Loss PVC Pipe


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#1 DGM_Jakarta

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Posted 03 December 2008 - 04:20 PM

Dear All,

I have a roject for Irrigation that need calculation of friction loss, I tried the freecall but not sure if its correct. The problem are for case 1 & 2
1. Diameter of the pipe : 20"
Material of pipe : PVC
Length of pipe : 1600 Metre Horizontal
Elevation : 5 Metre
Flow rate that i use : 300 Litre/second
Pressure at : 1,5 Bar
After that i used reducer and add another Pump for :
Diameter of the pipe : 16"
Material of pipe : PVC
Length of pipe : 1035 Metre Horizontal
Elevation : 1 Metre
Flow rate that i use : 150 Litre/second
Pressure at : 4 Bar
Can anyone help me count the friction loss pleaseeeeeeeee, i need urgently

2. Diameter of the pipe : 20"
Material of pipe : PVC
Length of pipe : 2100 Metre Horizontal
Elevation : 5 Metre
Flow rate that i use : 300 Litre/second
Pressure at : 1,5 Bar
After that i used reducer and add another Pump for :
Diameter of the pipe : 16"
Material of pipe : PVC
Length of pipe : 1740 Metre Horizontal
Elevation : 0 Metre
Flow rate that i use : 150 Litre/second
Pressure at : 4 Bar
Can anyone help me count the friction loss pleaseeeeeeeee, i need urgently

and how much losses at PVC Tee 20", PVC Elbow 20", Gate Valve cast iron 20".
Thank you very much... please... please.... somebody... helppppp

#2 BluSkyy

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Posted 03 December 2008 - 04:36 PM

sounds like you need an engineer.

#3 DGM_Jakarta

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Posted 03 December 2008 - 04:58 PM

QUOTE (BluSkyy @ Dec 3 2008, 11:36 PM) <{POST_SNAPBACK}>
sounds like you need an engineer.


yes sir, Im very confuse because i dont trust the engineer or consultant that made this project are professional, thats way i need someone to help me calculate this. This project is starting at January 2009 and I still dont have the right pump and design. Sigh... Thanks man

#4 MGX

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Posted 03 December 2008 - 07:16 PM

If all you need are friction losses, then you should be able to use the hazen williams equation.

Check the material data for frictional coefficients would be the first thing I'd do.

http://www.engineeri...tion-d_645.html

If temperatures vary through the year by a large margin, I'd use Darcy Weisbach.

http://www.engineeri...tion-d_646.html

For hazen williams, the friction coefficient is usually 150 for PVC pipe. I don't have any idea what it would be using darcy weisbach.

In the material data you should be able to find equivalent lengths for friction losses through the fittings.

Looks like you'll need to convert to standard units or find a metric formula.

Edited by MGX, 03 December 2008 - 07:18 PM.





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