Abstract
The selection of an economical pipe size for pumping plant and pipelines (mains and submains) in pressurized irrigation system should be based on careful economic analysis. A small diameter pipe may require a lower initial investment, but the head loss due to friction is greater and this increases the power cost. Similarly, a larger pipe involves a higher initial investment with less power cost. In this study, various mathematical or empirical models were formulated to select an economical pipe based on pipe diameter. These models were formulated for six different pipe materials such as reinforced cement concrete non pressure (RCC-NP2), RCC-NP3, galvanized iron, poly vinyl chloride (PVC) grey plain, PVC grey socket, and PVC grey rubber riveted (RR) joint. Each pipe material with diameters 40, 50, 75, 90,110, and 160 mm were selected to derive mathematical formulae. The prices for the different pipe materials of varying sizes were collected from various retailer shops. Further, mathematical formulation was done for calculating fixed and operating costs of these six pipe materials based on diameter of pipe, flow rate, electricity cost, and length of pipe. Key word: Pressurized irrigation system, pipes, fixed cost, variable cost, diameter of pipe.
Highlights
The pressurized irrigation system implies an application of different pipelines in the irrigation fields
The present costs of different pipes such as reinforced cement concrete (RCC), GI, and poly vinyl chloride (PVC) are shown in Tables 1 to 3, respectively
The pressurized irrigation system can attain a reasonable level of efficiency, when they are well designed, appropriately selected, and adequately operated
Summary
The pressurized irrigation system implies an application of different pipelines in the irrigation fields. These pipelines have a long life and low maintenance costs when properly installed They are essentially leak proof and water supply to the field plots are controlled precisely through the water distribution system. Since, this system operate under pressure, they can be applied in uphill or downhill sections, permitting delivery of irrigation water to areas not accessible to open channels or other distribution systems. This system operate under pressure, they can be applied in uphill or downhill sections, permitting delivery of irrigation water to areas not accessible to open channels or other distribution systems Their initial cost is high as compared to lined channels, but is more economical under many field conditions and for long term use.
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