Page 204 -

__ "_ ' _ Troubleshooting

~i:ii~:i~iii~ii:iii:i~i~!iiii~:i~i:iii~iii:~i~i~i~i:iiii~i~i~iii~i~i~i~i~i~i~iii~i~iii~i~i!!i~!ii:i~ii:i~iii~i:iii~i ~i:i~i::i~i!iiiiiii
: :iF! io R~te !
.............................................................................................

I ........ .......

I ~I~176 :,,,, ,, ~ ,,,,,~,,~,,

N I iill

....................................................................................... i iii i i i iii i iiiiii i i i iii !iiii i i i iii i iii i l i li i i i iiiii i iiiiii i i i i i i i i !i i i i i i i! i i i i i iiiiii i i i! i i i iii i liii i l i! i i i l i i i i i:iiiii i i~i:iiii:iiiiiiiiiiili i i:i!iiii i iiiiiii
i~i~ii~i:i.iiiiiii:i:iiiii:iiii:iii~i~i~iii~ii:i:iiiiii:iiii:ii:ii~ii~iii~iii:i~ii~ii:iiiii~iii~:iiiii
................. e~:~ ......................... R~I~ I
1 1

1 ,
Modily!
!:::!:!:!!:.:.::. :. ~::.!:!:!:::::::::::::::::::::::::::::::::::::: :! :.::.:~:::~ :::!: :.::. :.::: i:ii i, iliiii i!i1
............... ~iOiO.g .................... ~ig~N~
::::7,:
.............. :::: ::::::. ................................ :::: ......................
Figure 11.1 Insufficient flow rate chart

The noise and vibration will grow quieter and perhaps even die
away completely
9 The noise and vibration will get worse
[] Little or no difference is experienced
With the first result, the pump will be operating at a lower flow where a
lower level of NPSH is required, and the quieter, smoother operation
identifies that Cavitation is being eliminated.
If the noise and vibration gets worse, it indicates that the pump is
moving into a worsening condition of low flow which demonstrates a
problem with Recirculation.

..................................................... -__i ................................................................................................ ~iiii .................................................... 183