mag

Malaysia Water Research Journal
No. of ram pump required based on
early finding.
[Early finding: 5hours at 7.5liter/second
supplying 145m3 for a unit of ram
pump at 1.5Bar or 30psi]
Option 1: Three (3) unit of ram pump
at 1.5 Bar or 30psi
Option 2: One (1) unit ram pump with
achievement at 3.0Bar or 60psi
3.6 Result of Free Flow Simulation Testing
In this testing, the testing ranges of the Inverter Pump are from 36 Hertz to
maximum 50 Hertz. From the testing, due to the distance from Inverter Pump
to flow meter (before Ram Pump), the amount of the losses is about 27 - 34%.
However, there are only small reading differences between flow meter reading
and Inverter Pump manufacturer calculation. As such, this free flow testing result
was used as references for acceptable tolerance between Inverter Pump Setting
and real flow meter measurement. The summaries of free flow testing result are
as shown in Table 8.
Setting of
Inverter
Pump
(Hertz)
Table 8. Summary of Free Flow Simulation Testing.
Volume
(liter)
Test Period
(second)
Flowrate
R e c o r d e d
(liter/second)
Flowrate
Calculated
(liter/second)
Percentage
Differences
36 1703 300 5.7 8.0 29%
37 1756 300 5.9 8.2 28%
38 1819 300 6.1 8.4 27%
39 1843 300 6.1 8.7 30%
40 1858 300 6.2 8.9 30%
41 1900 300 6.3 9.1 31%
42 2027 300 6.8 9.3 27%
43 1966 300 6.6 9.5 31%
44 1956 300 6.5 9.8 34%
45 2009 300 6.7 10.0 33%
46 2032 300 6.8 10.2 33%
47 2099 300 7.0 10.4 33%
48 2115 300 7.1 10.7 34%
49 2199 300 7.3 10.9 33%
50 2201 300 7.3 11.1 34%
Institut Penyelidikan Hidraulik Kebangsaan Malaysia (NAHRIM)
49
National Hydraulic Institute of Malaysia (NAHRIM)