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Comparative Study on the Performance of Different Manually Operated Pumps Available in Bangladesh.

MA Bqui
Senior Scientific Officer
Farm Machinery and Postharvest Technology Division, Bangladesh Rice Research Institute, Gazipur-1701

Abstract/ Executive Summary:

Six different manually operated pumps were tested for comparing their performances. From this study, it is found that BRRI diaphragm pump to perform best up to 3 meter head. At places where lifting head is more than 3 (three) meters, Rower pump was suitable as its power requirement is low.

Keywords: Pump, Displacement, Discharge, Suction head, Pump characteristics

Location: FMPHT Research Lab

Start Date: 01-07-1981

End Date: 30-06-1982

Program Area: Farm Mechanization

Commodity: Pump

Objectives:

To compare the performance of different manually operated pumps

Methodology:

The following pumps were procured and their performances were evaluated. i) BRRI diaphragm pump ii) Comilla co-operative karkhana pump iii) Dev BKB pump iv) No. 6 Reciprocating pump, v) Rower pump vi) Twin-treadle pump Tests were conducted in the BRRI farm. Pumps were tested on a bamboo platform made to create desired head. Discharged water was collected in 4.94 liter capacity metal drum. Times was recorded by stop watch. Force was measured by the counter weight and spring balance, strokes were also recorded by counting. Tests were made at 1.5, 3 and 4.6 (5,10 and 14 ft) meter head. In Bangladesh water is generally, available within 4.6 meters, so tests were limited to 4.6.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 1982

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The characteristic curves for all the pumps are drawn and showed inverse relationship between head and discharge i.e. with the increase in head discharge decreases. Water horse power (WHP) for all pumps increased with the increase in head but reverse was true with discharge. Taking 1.5 m as the base discharge drops of 50%, 29%, 18%, 27%, 59% and WHP increase of 51%, 147%, 121% and 22.11% were recorded at 4.6m head for BRRI diaphragm pump, Dev BKB pump, no.6 Reciprocating pump, Rower pump and Twin Treadle pump, respectively. However, for the twin-treadle pump WHP increase was 72% at 3 m head. It is therefore evident that there was a fall in WHP when head was increased from 3 m to 4.6 m. This indicates that the pump will operate efficiently up to 3 m head. In case of comilla co-operative karkhana pump the performance was compared by taking 0.3 m head as the base. It was found that discharge dropped by 92% and WHP decreased by 75% when the head was increased to 0.9 m. Such a drastic change within a small change in head demonstrates the in efficiency of the pump. Considering the capacity/day (8 hrs.), BRRI diaphragm pump at 1.524 and 3.048 m heads appears to be the most promising water lifting device. Though capacity/day (8 hrs.) of Dev. BKB pump is comparable with BRRI diaphragm pump at 3.048 meter head, BRRI dia. Pump is considered better for its versatility and ease of installation. At more than 3.4 meter head, Rower pump is satisfactory as its purchase price, operating cost, and power requirement are low.

Knowledge Management: Report/Proceedings