Engineer Boards

# calculating Friction Loss PVC Pipe

## Recommended Posts

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".

##### Share on other sites

sounds like you need an engineer.

##### Share on other sites
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

##### Share on other sites
MGX    9

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.

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

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