mag

Malaysia Water Research Journal
At the setting from 36m3/hr till 38.4m3/hr of Inverter Pump setting, the average
of incoming water supply to and from ram pump and from become deteriorated.
From the Table 6, at the highest setting, 40 m3/hr and at the lowest setting, 34.4
m3/hr of Inverter Pump, the ram pump delivery also become deteriorated. This
leads to the conclusion that optimum water flow rate to the ram pump would
be a requirement. However, due to the river flows fluctuation, the ram pump is
recommended to have water retention structure in order to ensure continuous
performance.
3.6 Result of 24 Hours Simulation Testing
The ram pump could operate for more than 6 hours, 12 hours and 24 hours
continuously. It also found that no breakdown occurs after 24 hours. No heat
development that could lead to component ware and tare. Ram pump had
successfully supplied 11.647 (~12m3) per day or 7.03% of incoming water.
Conversion of the supplied water is: 12m3/day or 0.5m3/hours or 0.0083m3/
minutes or 0.0001388m3/second or 0.1388liter/second (~0.14liter/second). As
recorded by the pressure vessel of ram pump that the pressure decrease by
20% at the end of the testing from 10psi to 8psi, and the ram pump still could
operate. In this test, 165 m3 (1.91 liter/second) had been supplied to ram pump
delivering 0.14 liter/second. From these findings, it can be stated that flow rate
ratio for at site (laboratory or river) and ram pump are 1.91:0.14 liter/second
resulting in the ram pump deliverables at 7% water from the site. This means that,
if the ram pump located near to the river of 1.91 liter/s, the ram pump require 4.5
hours to fill in 2,270 liter seized of water tank. From these findings, the numbers of
selected sized ram pump could be determined by calculation. Tables 7 are the
calculation for determining numbers of ram pump for certain residential usage.
Table 7. Ram Pump Calculation Determining Numbers of Ram Pump for
Certain Residential Usage
Conditions/ Formula/ Input
Resident Population/ Water Demands
or Water Supplied
Water should be received by ram
pump according to ratio formulation
(1:10).
Adjustment of Water Supply In Time of
12 hours or 720 minutes or 43,200seconds
(Proposed 7.00PM to 7.00AM)
Output
1000m3 for 100 people
10,000m3
The River/ Dam Flow Rate Requirement:
= 1000 m3/ 12 hours or 720 minutes or
43,200seconds = 83m3/hour or 1.39
m3/minutes or 0.023 m3/s or 23 liter/
second.
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Institut Penyelidikan Hidraulik Kebangsaan Malaysia (NAHRIM)
National Hydraulic Institute of Malaysia (NAHRIM)