The function of nozzle problems is minor initially, so are often ignored. With the change of the throat, the change of spray characteristics is gradually obvious, and can be monitored.
Particle size: With flat fan nozzle wear or corrosion, the flow increases, the pressure drops, resulting in larger spray particles. This problem usually cannot be found out, but can be analyzed through the application of the results.
The nozzle alignment: when a nozzle is installed with multiple fan nozzles, it requires a complete uniform coverage, requires that all nozzles can accurately position, that is, all the fan-shaped spray pattern can accurately align, to ensure accurate coverage area. All spray must be mutually parallel, and form a 5 °- 10 ° corner with the nozzle. Otherwise, the entire coverage will be uneven.
Flow: When using centrifugal pump, the throat constantly wears, the nozzle flow usually increases under certain pressure. Because the increase in the flow is not easy to conceive, it is recommended to carry out regular flow detection. The flow detection can be read by detecting the flow meter, or using the collection method at a given pressure to collect water quantity within a certain time for measurement.
Spray shape: when fan spray nozzle throat is damaged, blocked or bond, the non-uniformity of the spray pattern changes is very easy to be found. And when the throat gradually wears, the spray shape of the change is not easy to be conceived, which can be found until the flow rate is increased substantially. For the applications require a very uniform spray coverage, it requires using special equipment or test to detect the uniformity of the spray pattern.
The spray shape of fan nozzle with elliptical throat is thick fan or tapered edge blade-shaped, and thus the overlap distribution of adjacent nozzles is very satisfactory. Angle contained in the spray pattern will be able to be found to reduce when the throat wears. You will find more water flow in the center, so that the water distribution increases. You can also find it is strip, hollow in the spray shape.
Hollow cone nozzle - basically a liquid ring, the uneven spray pattern is mainly performance the form of bars in certain areas. Solid cone, square, or oval-shaped spray nozzles, the spray shape unevenness is the same with the fan nozzle to some extent, and more water will be concentrated in the center. The spray pattern changes caused by the clogging of the solid inside the nozzle blades are not regular.
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This article is come from:http://www.industrialmachinery4u.com/how-to-detect-the-nozzle-failure.htm
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