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Drip Irrigation System Design - Basic Aspects Basic information on how to design micro irrigation system.
SATURDAY, NOVEMBER 28, 2015
CONTACT ME ON Follow @hrdpgajjar
Water carrying capacity of irrigation pipes FOLLOWERS
Hi everyone, Selection of proper pipe size in micro irrigation system (MIS) is very important part. Today i am going to share some details on water carrying capacity of irrigation pipes, There are 2 main aspects which affects water carrying capacity of irrigation pipe viz,
Pipe Size (i.e. Pipe ID, Pipe OD,Pipe weight,& SDR value of pipe) Velocity Lets discuss them in brief,
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Pipe Size: - Pipe size contains certain values like Pipe ID, Pipe Weight, Section Area of pipe etc. Calculation of the above values can be done as under,
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Pipe inside diameter (ID) :
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Water carrying capacity of irrigation pipes 2013 (1) 2012 (2) 2011 (2)
Pipe weight (Wt):
Section Area:
Standard dimension ration (SDR) of pipe: It's method of rating a pipe's durability against pressure. Please note that all the calculations are based on SDR 17 as irrigation pipes with this rating are used widely over here in India. Fluid Flow Velocity in irrigation pipes: - The fluid velocity should not exceed to certain limits to avoid noise and damaging wear and tear of pipes & fittings. Normally velocity in irrigation pipes should be between 1.0 to 2.0 m/sec. Velocity can be calculated by,
Now with all the above equations you can calculate water carrying capacity of irrigation pipes by the formula below,
Well its a big hectic job to calculate all this.... So I've made an excel sheet for calculating the same in easy way. All Calculations are based on pipes with SDR 17. You can download it from Here (Flow Calculator Download) Just select pipe size from the drop down list shown as under,
And then enter velocity in the next cell,
So maximum discharge will be calculated in the cell. For better result and longer lasting age of your micro irrigation system, try to keep flow velocity under 1.5 meter per second. You can also change the output unit from (m3/hr) to (LPS) by selecting drop down menu as under,
That's all for water carrying capacity of irrigation pipes. You can get more information on other aspects of micro irrigation in the links below,
1. Basic aspects of Micro irrigation system design 2. Technical aspects of MIS design 3. Head loss & velocity in irrigation pipes 4. Video tutorials on Micro irrigation system design 5. Micro irrigation system components installation Or Scan a QR code here,
I am a professional trainer for MIS system design, for cost & other information, please contact me on below mail address, - Hardip Gajjar (
[email protected]) Posted by Hardip Gajjar at 5:14 PM
27 comments:
THURSDAY, NOVEMBER 14, 2013
Video Tutorials on Drip Irrigation System Design Hi all, Today i am going to show some videos in details about how to draw drip irrigation system design. 1. Basics of Drip irrigation system design in Auto cad.
2. Head Loss / Friction Loss calculation in drip irrigation system design.
3. Inter crop design in MIS.
This videos are for new bees in the field of Micro Irrigation System design. You can find more information on drip irrigation system design in the topics below,
1. Basic aspects of drip irrigation systems design 2. Technical aspects of drip irrigation systems design 3. Drip irrigation component installations 4. Head loss & velocity in irrigation pipes 5. Water carrying capacity of irrigation pipes or scan a QR code here,
Hope you all like my effort.
Cheers!! Posted by Hardip Gajjar at 12:55 PM
8 comments:
THURSDAY, JULY 5, 2012
Head Loss & Velocity in Irrigation Pipes
Hi all, Today i am going to explain an important part of the drip irrigation design which is called Head Loss and Velocity in irrigation pipes. For providing proper water to the each plant of the field we must have to consider several things in mind like, 1. Actual water requirement of the field 2. Available flow of the pump 3. Total Head Loss in the system & velocity in irrigation pipes let’s see them in the brief, Actual Water Requirement of the field The first step of drip irrigation design is to calculate the total water required by the area. So how to calculate the water requirement? Let’s take an example, Suppose we have 1.2 ha area and we are going to grow cotton crop in it at the spacing of 1.40m X 0.40m. We are going to use inline dripper capacity of 2 LPH (litre per hour). So first thing is how many plants are there in 1.2 ha area? we can calculate it simply by, 1.2 X 10,000 = 12000 sq. meter now, = 12000 / 1.40 x 0.4 (Crop spacing) = 21429 plants in the field we are going to provide 2 litre water to each plant, so Total water requirement = 21429 x 2 (Total plants x dripper discharge) = 42,858 litre or 42.85 m3/hr. so 1.20 ha are required 42.85 m3/hr. water to irrigate cotton crop. Available flow of the pump In the above example we’ve pump of 10 HP and water depth is about 25m. so what is the available flow of the pump set? well we can calculate it with the device called water meter which is shown below,
There are many types of water meters available now a days. You can calculate the approximate pump flow with the following formula also. Pump Discharge = Motor HP X 75 X Pump efficiency Total Head (m) “ You can get details on every part of this formula in my previous post”
So we have pump set flow of about 36.93 m3/hr. we can irrigate the field with maximum of 36.93 cubic meter per hour of water. To carry these amount of water from water source to the field, we have to consider several things like Head Loss in pipes, Velocity etc. In drip irrigation system the total head loss in Main line should not be more than 5m and 1.5m in sub main lines. And maximum permissible velocity is 2.0 m/sec. we can calculate head loss and velocity with "Hazen Williams Formula”
Where, Roughness constant for PVC pipe is 150 Pipe ID = (Pipe OD – Minimum Thickness of Pipe) - Max. thickness of Pipe Total Head Loss (m) = (Length of pipe (m) X Pressure drop) / 100 Velocity can be calculated by,
As we have seen all this calculation is bit a difficult job to do. So I have created an excel sheet for calculating all the data above. You can download it from HERE (Irrigation details calculator). it looks like,
You have to select pipe size and pressure rating from hydraulic calculation section as under,
Select the desired flow unit from the drop down menu (m3/hr or liter per second)
In the next field enter Pipe length (in meter). This will calculate total head loss, friction loss and velocity. (for drip irrigation total head loss in main line should not be higher than 5m/1000m of pipe. And in sub main line it should be 1.5 mtr per submain line) Head loss cell color is calculated as per before mentioned criteria, so when head loss goes beyond 5 mtr it will turn in to red, for easy understanding.
So always try to keep your head loss below 5 meter per 1000 meter of main line and velocity below 1.5 meter per second for better results and longer lasting age of your micro irrigation system.
As you see all the units are in metric system of measurement. so if you are following units you have to convert the values don’t panic just click on the last sheet named “Unit Conversion” here you can convert different units.
You can also calculate the Pump HP with the pump power calculator in the sheet,
There is a storage capacity calculator tab, so you can calculate the storage capacity of water tank it required.
At last a small video tutorial on head loss and velocity calculation in irrigation pipes,
That’s all for hydraulic calculation of irrigation pipes. You can find more information on drip irrigation systems design as under, 1. Basic aspects of drip irrigation system design 2. Technical aspects of drip irrigation system design 3. Drip irrigation system component installation 4. Video tutorial on drip irrigation systems design Or scan a QR code here,
Don’t forget to reply if you have any suggestion / question. cheers!! Thanks Posted by Hardip Gajjar at 1:43 PM
61 comments:
Labels: Friction Loss, Friction Loss in irrigation pipes, Head Loss
FRIDAY, JANUARY 13, 2012
Drip Irrigation Images Hello everyone!! In my previous posts I’ve explained too many aspects of drip irrigation system. But as we all know, One practical on site is far better then 1 month of learning in the classroom. So today i have done a little effort to show you the real drip irrigation system on field. Hope you all like it. Intercropping in Mango with chillies.
Component fittings
A small demo for Drip irrigation,
Thanks for watching, You can find more details on drip irrigation systems design as under,
1. Basic Aspects of Drip irrigation system design 2. Technical aspects of drip irrigation systems design 3. Head loss & Velocity in irrigation pipes 4. Video tutorial on drip irrigation system design 5. Water carrying capacity of irrigation pipes Or scan a qr code here,
Cheers Posted by Hardip Gajjar at 1:58 PM
16 comments:
Labels: Drip Images, Drip Irrigation
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