Journal of Agricultural Science and Engineering
Articles Information
Journal of Agricultural Science and Engineering, Vol.5, No.2, Jun. 2019, Pub. Date: May 30, 2019
A Portable Orifice Meter for Pump Flow Measurement
Pages: 49-55 Views: 1255 Downloads: 714
[01] Mahbub Hasan, Department of Civil, Mechanical Engineering & Construction Management, Alabama A&M University, Normal, USA.
[02] John Replogle, Research Hydraulic Engineering (Retired), Arid Land Agricultural Research Center (ALARC), Phoenix, USA.
[03] Aschalew Kassu, Department of Civil, Mechanical Engineering & Construction Management, Alabama A&M University, Normal, USA.
[04] Ashraf Al-Hamdan, Department of Civil and Environmental Engineering, University of Alabama in Huntsville, Huntsville, USA.
Tube well irrigation system serves a significant land area for crop production in Bangladesh. Tube well discharge measurement is very important to schedule irrigation practices, means to decide (a) when to irrigate, and (b) how much of water should be applied into the field. Discharge is measured at the time of tube well commissioning only. Thereafter, no one knows how much of flow size is there in their crop field. This may be due to unknowingness the importance of correct flow size that plays a vital role in crop production. Another severe factor is the unavailability of a suitable equipment for flow size determination which can be manufactured with (a) the locally available materials, (b) the materials cost is cheaper, (c) easy to install and operate, and (d) handy. With this end in view, a portable orifice meter was designed and fabricated in the Agricultural Engineering workshop of Bangladesh Agricultural Institute (BARI). This meter was designed for measuring pump flow size operated for shallow tube wells having 4-inch delivery pipe. Concept of end-cap orifice meter was considered to design this portable orifice meter. Shortening the conventional orifice meter and introducing the slit type (rectangular shaped) at the orifice outlet was found to be a very good, handy, cheaper, simple, and fabricated with locally available materials, and shows a promising agreement while compared the calibrated discharge (Qc) with predicted discharge (Qp). Errors from using the regression equation to obtain discharge ranged from 0.09 to 2.17% whereas the errors ranged from 0.24 to 6.57% when considered the laboratory measure discharges.
Pump Flow Measurement, Orifice Meter, End-Cap Orifice, Vena Contracta Coefficient
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