Ensuring Optimal Pressure
When undertaking a spray operation, one must ensure that the optimal pressure is achieved ---- that is, the pressure at the nozzle tip where the nozzle's performance is mazimized or optimized. Special attention is required in order to ensure optimal pressure in practical situations, such as employing a long hose for operation (since a loss of pressure occurs as liquid moves through the hose, and using a motor sprayer for spraying over a sloped field (since if either the motor tank or the spraying person is positioned higher than the other, flutuation in pressure will occur).
1. Resistance created within the hose will lead to loss of pressure. An easy way to calculate such pressure loss is by applying the following formula:
P=4.7×L×Q2/D5
( where P represents pressure loss (MPa), L represents hose length (meters), Q represents flow rate (liters per minute), and D represents inner diameter of hose (milimeters))
2. Altitude differences between the motor tank and the person spraying creates changes in pressure. Specifically, a 10 meter difference in altitude will lead to a pressure change of 0.1 MPa.
For example, when using KIRISTAR for orchards (2 nozzles) the flow rate will be 6 liters per minute and the optimal pressure 1.5 MPa. When a hose with a inner diameter of 8.5mm and a length of 100m is attached to this product, under an altitude difference of 50 meters, then the pressure loss will be as follows:
-Pressure loss related to hose: 0.4 MPa-Pressure loss related to altitude difference 0.5 Mpa thereby leading to a flow pressure at orifice becoming 1.5 MPa.
