Calculating friction loss for Irrigation system

[dutagetraco]

Dear All,

I have a project for Irrigation plant a rice seeds that need calculation of friction loss, I tried the freecallculator, but not sure if its correct. I have two problem and The problem are for case 1 & 2 because each pump for case 1 & case 2 are different.
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

 

[Latexman]

Is the 20" the suction to the pump and the 16" the discharge line?

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Latexman

 

[BigInch]

Not much loss in 2000 +/- m
Why so many pumps?

**********************
"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[Artisi]

Please expand you info some more - too many unknowns:

Length of pipe : 1600 Metre Horizontal
Elevation : 5 Metre
Flow rate that i use : 300 Litre/second
Pressure at : 1,5 Bar [highlight]Where is the pressure being measured[highlight]
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 [highlight]Where has the other 150l/s gone?[highlight]
Pressure at : 4 Bar [highlight]Where is the pressure being measured[hightlight]


Same applies to the second part.

 

[Artisi]

Seems the highlighted text in the last post hasn't worked out- - more practice needed.

 

[Zapster]

Why so many pumps?

Because that is what the homework assignment required.

 

[getraco]

very well then but how can i choose the right pump if they want to use pvc pipe with total length of 14107 feet with 20 inches diameter, the capacity what im asking are 4755 USGPM and i still cannot calculate how much psi that i need to fill the pipe till end of pipe. The rivers depth are around 23 feet to 33 feet. The problem is how to design the pump and how many pump i have to use along the pvc pipe, but please consider that the maximum pressure for pvc pipe are 116 psi. Thanks guys, any suggestion??
Reply With Quote

 

[getraco]

The suction pipe are 20" pvc pipe.

 

[Artisi]

At this stage the information given is pretty useless to make any recommendations on pump sizing and the second set of data given has only confused it further.


I don't have friction loss charts for 20" PVC but using 20" new steel pipe looks like the friction head (only) thru 14107 ft @ 4755 UGGPM will be in the order of 140ft.

Where are you - my consultancy rates are reasonable and I'm happy to fly economy for short-haul and business class for over 6 hours flying

 

[BigInch]

You really don't need to try to be designing an irrigation system on the internet. Download a copy of EPAnet and learn how to use it.

Its Free

http://www.epanet.com/downloads.asp

,or as Artisi suggests, find a consultant.

**********************
"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/