This is another common issue
A contractor called and inform that pressure not enough , when earlier given was
a) Given
Capacity : 20 m3/hr at 42 m Head ( 4.2 Bar )
Pump Speed : approx 2100 rpm( slurry pumps )
b) Offered pump with same operating parameter and
same operating speed
c) later called and say need to operate at 6 bar
d) This is an indication that the user is not aware or not knowing what is his
requirement , which is 6 bar
e) what can be done
1) as pump is belt driven . adjust the pulley diameter to the required speed
and with reference to pump curve , there has been cases of people guessing the
speed and do many changes before arriving at the required speed and head
2) the motor 15 hp was designed for working pressure of 4 .2 bar at 2150 rpm
therefore the motor has to be upgraded to the required BHP ( 18.5 kw ) .Again ,remember
to refer pump curve
Above is a very simple issue , but the first thing that come to the user's mind
" hey . your pump lousy man , can only reach 4 bar "
" your motor too small lah ..that is why cannot reach 6 bar ''
What is being highlighted here is that . if the User knew what he wanted and
size the pump correctly . there is no waste of time doing further modification which
also incur additional cost,,,
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