With VSP, the pump is theoretically capable of operating on an unlimited number of pump curves that range between a minimum and a maximum. In the information provided by the pump manufacturers, discharge-head curves are usually provided for several impeller diameters and for two or more limited impeller speeds. In contrast, there are variable speed pumps (VSP) that have the ability to adjust the impeller rotation and can be used to make desired changes in the pumping system. Consequently, use of a constant speed of impeller reduces the flexibility of the pumping system. Constant speed pumps have a fixed rotational speed of the impellers which limit the ability to modify the flow. 2019) and a reduction in pollution and emission of greenhouse gases that cause climate change (Li et al 2020 Cheng et al. Therefore, increasing their efficiency leads to significant savings in energy consumption (Li et al. Today, more than 60% of electricity consumption in the industry is from electric motors. This imposes additional costs, especially on pressurized irrigation systems, which are constantly changing their irrigation needs, sometimes monthly. If different flows and pressures are required, unsuitable pump speeds will yield excessive energy losses. Water pumping stations usually use fixed speed pumps that have a good efficiency over a small range of pressure and flows. 2008), there are still opportunities for further improvements. While agricultural pumping stations, their energy consumption and efficiencies have been improved (Abadia et al. In recent years, the cost of energy has increased faster than other agricultural costs. This information helps engineers who are not familiar with commutation process.

Step-by-step calculations for a sprinkler irrigation system design are the contribution of this study. Therefore, the use of variable speed pumps in pressurized systems is recommended. In addition, the variable speed pump system reduces the electrical consumption 57.6% compared to a fixed speed pump. The results show that using a variable speed pump increases the average pump efficiency by 18.7%. The diameter of the main pipes is 8 and 6 inches. The selected pump station includes a real sprinkler irrigation system near Tabriz city, Iran, with 3 lateral pipes and 600 m length of main pipe. Two pumping station scenarios including a fixed speed pump and a variable speed pump are considered. In this study, the application of variable speed pumps in pressurized irrigation systems is investigated.

Using an electronic drive circuit, the electrical frequency can be changed, and the rotation speed of the pump motor can thus be modified. When the demand for the discharge differs from the design discharge, the required demand (discharge and head) could be met by changing the pump speed without making any special changes in the system. However, constant speed pumps are not easily able to deal with changing demands in water flows. In pressurized water distribution systems, a constant speed pump is often used because of its simplicity.

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