Evaluation of the technical and economic performance of the engines and pumps of artesian wells in Hamedan District

Suleiman Qoussi Sahari1and Abdullah Mohammed Yayeh 2
1Assistant Professor, Department of Agricultural Engineering – College of Agriculture – Sana’a
University sssehari@yahoo.com
2Professor, Department of Agricultural Engineering – College of Agriculture – Sana’a University

Abstract:

The research aimed to evaluate the technical and economic performance of
the engines and pumps of artesian wells in Hamedan District, by taking a
random sample of fifty motorized wells with the pump to take the readings and
measurements required for evaluation. The actual current situation was
evaluated and compared with the calculated model for each of the wells,
engines and pumps in Hamedan District, and the research reached a number
of results, perhaps the most important of which are: that the percentage of
excess capacity (wasted) in all diesel engines was 52% of the total capacity of
the current engines, Which represents the number of engines more than 1,100
engines with a capacity of 55 hp. The increase in wasted power results in an
18% increase in diesel consumption over the typical calculated situation. In
addition, the increased current capacity of the engines and the reduced
number of operating hours per oil change interval compared to the
recommended, resulted in an increase in oil consumption by 62% over the
typical. The results also showed that the percentage of excess capacity in all
pumps was 58% of the total capacity of the current pumps in the directorate,
which represents more than 1625 pumps with a capacity of 41 horsepower.
The results also showed that the average annual operating hours for each well
with the engine and pump in the district was 61% higher than the
recommended rate. Therefore, the current maintenance costs are 47% higher
than the typical calculated, and the profit has increased to 100%. The results
also showed that the current total costs of extracting a cubic meter of water
from the well were 25 riyals, while the typical total costs calculated for this
were 19 riyals. The results also showed that the increase in the current
capacity of motors and pumps over the calculated capacity led to an increase
in the current fixed costs by 30%, the current variable costs by 22%, and a
decrease in the current total profit by 23% compared to the calculated model.
The results also showed that the relative importance of the current cost
components in descending order are 46, 20, 12, 10, 6, 5, and 1% for the costs
of diesel, labor, oil, depreciation, maintenance, interest, and storage, respectively. The results also showed that the total annual actual (productivity)
withdrawal of groundwater through 1190 artesian wells was 128 million cubic
meters, while the productivity of the break-even point (profit and loss zero) for
the current situation was 17.3 million m 3 / year for the district, which is seven
times less than the total withdrawal The current groundwater in the
Directorate, therefore, groundwater can be preserved by assuming reducing
the current withdrawal to 33% with a profit rate of 51% for the current
situation, and the current withdrawal can be reduced to 20% when using the
capacities of the calculated model motors and pumps with a profit rate of 65%
for typical situation.