Performance Evaluation of High Discharge Low Head Pumps
By: Rini Rani S.
Contributor(s): John Thomas K (Guide).
Material type:
BookPublisher: Tavanur Department of Irrigation and Drainage Engineering, Kelappaji College of Agricultural Engineering and Technology 1998DDC classification: 631.3 Online resources: Click here to access online Dissertation note: M Tech Abstract: Paddy cultivation in Kuttanad and Kole lands is made
possible only after large scale dewatering operations. These
water logged lands have to be drained in the shortest possible
time to initiate seed bed preparation. The short time
available for seed bed preparation need adoption of high
discharge low head pumps. The most commonly used centrifugal
pump is incapable of giving corresponding increase in
discharge rate even if the lift required is reduced to a
minimum. So this study was undertaken to help to identify a
suitable portable pump for meeting the specific requirement of
drainage in Kerala. Mixed flow and axial flow pumps imported
from Thailand were used for this purpose.
The study included testing of lS-cm mixed and axial flow
pump at the specially designed and constructed test bed at
different speeds and at different water levels in the pumping
sump. For each test, from the data obtained discharge, input
power and efficiency were calculated. Using the calculated
values performance characteristic curves were plotted and
regression equations were developed for discharge
efficiency, discharge - total head and discharge - input power
relationship at each speed. Performance curves were also
plotted keeping total static head const ant and regression
equations of speed - discharge, speed - total head, speed -
input power and speed efficiency relationships were
developed.
The maximum efficiency of IS-cm mixed flow pump was 42.16
per cent at a speed of 1000 rev/min, against a total head of
217.33 cm and a discharge rate of 49.47 L/s. The input power
corresponding to this efficiency was 3.4 hp. The best
performance of mixed flow pump was noted at a working speed of
1000 rev/min. The maximum efficiency of IS-cm axial flow pump
tested was only 18.05 per cent at a total head of 160.55 cm
and a discharge of 24.88 L/s. The corresponding speed was
2500 rev/min and input power was 2.95 hp. The best
performance of axial flow pump was noted at a working speed of
2500 rev/min.
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|---|---|---|---|---|---|
Theses
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KAU Central Library, Thrissur Theses | 631.3 RIN/PE (Browse shelf) | Available | 171523 |
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M Tech
Paddy cultivation in Kuttanad and Kole lands is made
possible only after large scale dewatering operations. These
water logged lands have to be drained in the shortest possible
time to initiate seed bed preparation. The short time
available for seed bed preparation need adoption of high
discharge low head pumps. The most commonly used centrifugal
pump is incapable of giving corresponding increase in
discharge rate even if the lift required is reduced to a
minimum. So this study was undertaken to help to identify a
suitable portable pump for meeting the specific requirement of
drainage in Kerala. Mixed flow and axial flow pumps imported
from Thailand were used for this purpose.
The study included testing of lS-cm mixed and axial flow
pump at the specially designed and constructed test bed at
different speeds and at different water levels in the pumping
sump. For each test, from the data obtained discharge, input
power and efficiency were calculated. Using the calculated
values performance characteristic curves were plotted and
regression equations were developed for discharge
efficiency, discharge - total head and discharge - input power
relationship at each speed. Performance curves were also
plotted keeping total static head const ant and regression
equations of speed - discharge, speed - total head, speed -
input power and speed efficiency relationships were
developed.
The maximum efficiency of IS-cm mixed flow pump was 42.16
per cent at a speed of 1000 rev/min, against a total head of
217.33 cm and a discharge rate of 49.47 L/s. The input power
corresponding to this efficiency was 3.4 hp. The best
performance of mixed flow pump was noted at a working speed of
1000 rev/min. The maximum efficiency of IS-cm axial flow pump
tested was only 18.05 per cent at a total head of 160.55 cm
and a discharge of 24.88 L/s. The corresponding speed was
2500 rev/min and input power was 2.95 hp. The best
performance of axial flow pump was noted at a working speed of
2500 rev/min.
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