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• การหาจำนวน หัวมินิสปริงเกอร์ Micro Irrigation Calculator (U.S. units)

A micro spray system for oranges is considered where the tree spacing is 16 feet and the row spacing is 16 feet. The crop peak evapotranspiration (ET) is .3 in/day and the application efficiency is 85% (.85). A Micro Quick 12 gph blue nozzle is chosen for a lateral with I.D. of .830 in. and length of 400 feet. The pressure on the last micro spray on the lateral is 15 psi. There are 20 laterals on the manifold. Desired pressure loss in the manifold is not to exceed 2 psi.



1. The Tree daily requirement = 56.3 gal (Also, Lateral tubing per acre = 2272 ft.)
2. The Precipitation rate = .075 in/hr, gpm / ac = 34
3. The Micro Quick lateral pressure loss = 2.6 psi (Also, Total flow = 4.19 gpm, flow variation = 8.4 %)
4. The Micro Quick feeder tube pressure loss = 0.8 psi
5. The Manifold required size = 2.54 in. (Also, Total flow = 83.0 gpm, max. velocity = 5.3 fps)
6. Choose 2 1/2" IPS 125 pipe. (Manifold pressure loss = 1.5 psi)

จาก: http://www.rainbird.com/ag/reference/calculator2.htm