# Need Help calculating Friction loss for irrigation

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".

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lehua49

Hi dgm,

Quite a request. Here is a web site obtained from google.

PVC Pipe Pressure Loss Calculator

Probably unfortunately for you it is in english units and not metric. It uses the Hazen-Williams formula for friction loss calculation. Check out google for "how to calculate pvc pipe friction losses in metric units". GL and aloha.

December 3, 2008 at 8:38PM
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lehua49

Hi again dgm,

Here is a better site:

http://www.engineeringtoolbox.com/hazen-williams-water-d_797.html

First section of Case 1 is:
a. 0.297 ft per 100 feet of run
b. 0.1 psi per 100 feet of run
c. 15.58 feet of friction head loss
d. 6.7 psi friction head loss
e. 4.86 ft/sec velocity.

GL with rest. Got these calcs from site using H-W formula.
Aloha.

December 3, 2008 at 9:12PM
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