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

• Head loss of the Total Main Line Length to a Valve can be taken as Main Line Loss for Total Head Loss Calculation.
• The length of Main Line to a Valve (DV2) = m

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

• Head loss of the Highest Elevation end point Flow under a Valve can be taken as Solenoid Valve Loss for Total Head Loss Calculation.
• The Maximum Flow of Solenoid Valve (DV2) = 0.05 lps

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

• Head Loss due to Elevation difference from the Pump Room to irrigation System = 10.95 m.
• Head loss due to Pump Room Fittings can be considered as 5.0 m.
• Maximum Head Loss due to Pipe Fittings (Main line & Lateral lines) can be considered as 3.0 m.

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.