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Improvement and Performance Evaluation of an Axial Flow Pump

M A Hossain
Farm Machinery & Postharvest Process Engineering Division Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701

M S Miah
Farm Machinery & Postharvest Process Engineering Division Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701

M A Hoque
Farm Machinery & Postharvest Process Engineering Division Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701

M I Hossain
Farm Machinery & Postharvest Process Engineering Division Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701

Abstract/ Executive Summary:

Three sizes of axial flow pumps such as 76 mm (3²), 102 mm (4²) and 150 mm (6²) diameters and each of 4.5 m long were designed, fabricated and tested at Farm Machinery and Postharvest Process Engineering Division, Bangladesh Agricultural Research Institute, Gazipur during 2013-16. The pumps were fabricated with locally available such as MS (mild steel) pipe, MS solid shaft, MS rod, MS sheet, bearing, MS pulley, rubber bush and necessary spares. The operating power for 76 mm, 102 mm and 150 mm pumps were 10.0 hp, 12.5 hp and 14.0 hp diesel engines. All the pumps were tested at the pump testing beds of FMPE Division of BARI, Gazipur for surface water lifting at the heads of 1.0, 2.0, 3.0 4.0 and 4.5 m and pump speeds of 1800-2000 rpm. Discharges of of 76 mm, 102 mm and 150 mm diameter pumps varied linearly from 5.65 to 18.20 L/s, 16.43 to 29.24 L/s and from 40.72 to 66.67 L/s, respectively for variation of head from 1.0 to 4.5 m. For 76 mm, 102 mm and 150 mm pumps, the peak pump efficiencies and brake powers were found for the discharge of 13 L/s, 21 L/s and 46 l/s, respectively. Therefore, 76 mm, 102 mm and 150 mm diameter axial flow pumps were found technically suitable for surface water lifting. These axial flow pumps may be recommended for surface water irrigation in Bangladesh.

Keywords: Surface water, Irrigation, Optimum power, Pump speed, Fuel consumption, Axial flow pump

Location: Farm Machinery and Postharvest Process Engineering Division of Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur, Bangladesh

Start Date: 00-00-2013

End Date: 00-00-2016

Program Area: Farm Mechanization

Commodity: Pump

Objectives:

Objectives

a). To design and fabricate axial flow pumps for surface water irrigation.

b). To determine optimum power, pump speed, discharge, and fuel consumption of axial flow pump.

Methodology:

Small (76 mm), medium (102 mm) and large (76 mm) size of axial flow pumps were developed at Farm Machinery and Postharvest Process Engineering Division of Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during 2013-16. A 150 mm (6") diameter axial flow pump was designed, fabricated and tested during 2013-14. First engineering drawing was made as per design using AutoCAD software. Then fabrication was done according to the drawing using available local materials. Another 102 mm (4") diameter axial flow pump was designed, fabricated and tested during 2014-15. The current year (2015-16) a 76 mm (4") diameter axial flow pump was designed, fabricated and tested. The pump was fabricated with MS pipe, MS solid shaft, MS rod, MS sheet, bearing, MS pulley, and necessary spares. The functional parts of the pump are delivery pipe, impeller, impeller housing, rotating shaft (25 mm diameter), MS pulley, bearing etc. The impeller is the main part of an axial flow pump. An impeller was designed suitable for 76, 102 and 150 mm diameter axial flow pumps. There were five numbers of mixed flow type blades in the impeller. The delivery pipe was 4.60 m long and it was made of mild steel. The impeller was assembled in the housing pipe about 10 mm larger diameter than the delivery pipe. A strainer was attached at the inlet of the pipe to filter the water from the dirt, leaves, polythene, etc. The impeller was fixed one end of the shaft and in another end 89 mm pulley was attached for power transmission. Some problems were observed during testing of the pumps such as backflow of water, pump vibration, water turbulence, etc. Based on the test results, these three sizes of axial flow pumps were improved during 2015-16. Photographic views of three types of axial flow pumps. The axial flow pump was tested in the pump testbed of Farm Machinery and Postharvest Process Engineering Division, Bangladesh Agricultural Research Institute, Gazipur in the month of January to March 2016. The 76 mm axial pump was operated by 10.0 hp diesel engine (model S195N, Changchai Co. Ltd., Changzou, China). The 102 mm and 150 mm sizes pumps were operated by 12.5 hp and 14.0 diesel engines of same company. Power was transmitted by 76 mm (3.0"), 89 mm (3.5"), 102 mm (4.0"), 144 mm (4.5") and 127 mm (5.0") diameter pulleys and V belt (B60, Busan, Korea). The pulley size of all engines was 127 mm in diameter. At different pulley combinations, the optimum size of pump pulley was selected experimentally. The pump was tested at 1.0, 2.0, 3.0 and 4.5 m heads. At each of head, the pump was tested at speed of 1800-2000 rpm. Operation of pump in each head was replicated three times. Fuel consumption of engine in each of the speeds was determined after the operation of the pump for the one-hour duration. Fuel consumption was measured by an external transparent 5 liter plastic container placed on top of the engine and connected by fuel valves. After running the pump so that water output stabilized, the fuel input into the container was measured volumetrically before and after each run of the pump.The water discharge of each pump was measured by a volumetric method in a 5.49 m³ (6.1 m long, 0.72 m deep and 1.25 m wide) concrete made water tank. The speeds of the engine and pump were measured by the tachometer.

Source of Information: Annual Research Report 2015-2016, Farm Machinery & Postharvest Process Engineering Division Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The engine size of 76 mm, 102 mm and 150 mm diameter axial flow pumps were 10.0 hp, 12.5 hp and 14.0 hp, respectively. Speeds of five blades mixed flow of 76 mm, 102 mm and 150 mm axial flow pumps were found to be 1800-2000 rpm. Discharges of 76 mm, 102 mm and 150 mm diameter pumps varied linearly from 5.65 to 18.20 L/s, 16.43 to 29.24 L/s and from 40.72 to 66.67 L/s, respectively for variation of the head from 1.0 to 4.5 m. For 76 mm, 102 mm and 150 mm pumps, the peak pump efficiencies and brake powers were found for the discharge of 13 L/s, 21 L/s and 46 l/s, respectively. Therefore, 76 mm, 102 mm and 150 mm diameter axial flow pumps were found technically suitable for surface water lifting.

Knowledge Management: Report/Proceedings