Design & Installation

PVC pipeline is laid underground through center of the farm with 50 mm quick-fit riser -outlets (end plugged) spaced at every 30 mts to 40 mts. One of these outlets gets connected progressively to rain - gun mounted on trolley wheel stand, through portable quick fit laterals of hdpe/alu sprinkler pipes. After working at one position for about 2 hrs. (depending on the crop, season & soil) the rain-gun is shifted to next position ,such that the whole area is irrigated in a cycle of one to one and half week.  


Quick fit accessories for above installation are available. The installation cost for portable rain-gun system is very low appxly. Rs 2,500/- to rs 3,500/- per acre, where required pvc underground mains & pumpset is available at the farm.

PVC small dia main and submarines are laid underground at suitable distances with quick fit riser-outlets spaced throughout the field.only rain-gun is required to be shifted progressively on these outlets, covering entire farm in short cycle. The cost of such installation is around rs 10,000/- to rs 15,000/-per acre. And is highly convenient for high value and dense crops with considerable saving in labour for shifting pipes.

This irrigator machine is complete unit in itself, having hdpe pipes rolled on its turbine -driven reel. Driven by inlet water pressure, the turbine mechanism rolls,hdpe pipes,which has been first laid through the farm. Trolly mounted rain-gun unit which is attached at the end of the pipe line moves slowly towards the machine, giving rain required its length of run.the traveling speed is adjustable for giving required rain over a period. This machine is very popular overseas, as it saves on labor fully while irrigating. The cost of this machine is from rs. 1. 2 lacks to rs. 6 lacks depending on the model & capacity.

A Typical Design Details For Portable Rain - Gun Irrigation System

Area to cover under sprinkling	4 hector 300 x 135 m2	8 hector 400 x 200 m2
Water source position considered	-	-
Rainfall intensity per irrigation	38mm	40mm
Frequency of irrigation	8 days	9 days
Pumping hrs. Per	14 hrs	12 hrs
No of rain guns used	1 no skipper	1 no mariner
Dicharge capcity of rain guns	250 lpm at 10. 8 mm/hr	550 lpm at 12. 7 mm/ hr
Working pressure of rain-gun	2. 5 kg/m2	3 kg/m2
Spacing between two rain gun setting on main & laterals	36 x 36	60 x 42
Area covered per setting for rain gun to give 38 mm rainfall	1300 sq. Mt.	2520 sq. Mt.
Time req. Per setting to give38 mm rain fall	3. 5 hrs	3 hrs
Number of rain gun setting per day	4 no	4 no
Area covered per day	5,200	10,080
Area covered per 8 days cycle	41600 m2 (4 hector)	80640 m2 (8 hector)
Maximum friction loss in main + lateral	7 to 9 mts.	6 to 8 mts
Total head req. (excluding depth of water source )	30 mts	10 hp high
Length and dia of pvc mains	300 mt x 75 mm	400 mt x 100 mm
Length & dia of high pressure lateral hose	60 mt x 75 mm	80 mtx 90 mm