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Head Calculation For Irrigation Booster Pump

 

Station No. Valve Size of Valve Controller’s Program flow in lps Duration (min) Total flow as
per specified duration (litres/day)
1 DV – 1 1″ A 0.72 60 2592
2 DV  -2 1″ A 0.05 60 180
2772
Total run time 2 hrs
Total Water Requirement – 2.6  m3/day

Maximum flow of the system: 2.6 m3 per hour (Considering water window of 1 hr/day)

Head Loss Calculation in Main Line

Sl.No Main Line Length in m Flow in the Section, in lps Size of the Pipe Head Loss in (Mtr)  from Pipe Characteristic Sheet
1 A -B 59 0.05 1.5” 0.01
2 B –C 8 0.05 1.5” 0.005
  Total Loss 0.011

(Note; friction loss is calculated as per the Darcy–Weisbach equation  formula uPVC pipe Class E)

Head Loss Calculation in Solenoid Valve

Sl.No Solenoid Valve Flow in the Section, in lps Size of Valve Head Loss in (Mtr) from Valve Characteristic Sheet
1 DV02 0.05 1” 0.138

The length of lateral Line of Valve (DV 02) = m

Sl.No Lateral Line Length in m Flow in the Section, in lps Size of the Pipe Head Loss in (Mtr)  from Pipe Characteristic Sheet
1 a– b 46 0.05 1” 0.05
2 b – c 7.40 0.05 1” 0.012
3 c – d 25 0.05 1” 0.032
  Total Loss 0.094                                                 

(Note: Friction loss is calculated as per the Darcy–Weisbach equation  formula uPVC pipe Class E)

Total Head Requirement of irrigation system

Total Head Loss Calculation:

Sl.No Item Description Head Loss
1 Minimum Required operating Pressure for Drip  Irrigation System 20.0 m
2 Head Loss in Main Line 0.011 m
3 Head Loss in Lateral Line 0.094 m
4 Head Loss in Solenoid Valve 0.14 m
5 Head Loss Due to the Fittings of  Pump Room 5.00 m
6 Head Loss Due to Screen filter 2.00 m
7 Head Loss Due to Elevation Difference 10.95 m
8 Head Loss due to fittings in main line 3.00 m
  Total Head Loss 41.19 m
Safety Factor @ 10%       6.17 m
  Head Required for the Pump 47.36 m

Flow of the system –  2.6 m3/hr  

15% safety factor  –  0.39 m3/hr

Flow of pump -2.99m3/hr

The duty point of the pump should be 2.99 m3/hr @ 48 m head.

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