Make the valve work up to 50% opening on the first
pump and control the other 50% when the second pump
starts. Regards,
George
- Arif patel <marif_patel@hotmail.com> wrote:
> Hello Members,
>
>
> I have a small project to modify control of exiting
> pumping system which
> trasfer fluid from one tank(50 feet dia) to other
> tank(50 feet dia). The
> level of source tank is only variable at 5 feet
> however the discharge tank
> level varies from zero to 45 feet. The first pump
> starts automatically at
> particular level(70 %) in source tank and the second
> pump starts
> automatically if source tank level goes high by 3
> feet.The rated flow rate
> for each pump is 500 GPM at 50 psig discharge
> pressure.
>
> The problem is that if manual valve at the discharge
> of pump is throttled
> initially (with zero level in discharge tank) the
> pump will not not be able
> to pump if discharge tank level rises to 45 feet.
> And if discharge valve is adjusted for full level in
> discharge tank , the
> pump will operate way beyond it rated flow when the
> discharge tank level is
> low..
> The problem is that there is no space to install
> flow orifice.
>
> I am thinking to add a control valve which will
> operate based on level
> transmitter of source tank and discharge tank.That
> is if source tank level
> goes to 70 % and if level in discharge tank level is
> low , the valve will
> open partially. The valve will open gradually if
> discharge tank level is
> rising.It means that valve opening wiil be based on
> level of discharge
> tank.But the valve will have to be adjusted again
> automatically when
> second pump starts.
> Can I get some good ideas for the given problem
>
> Regards,
> Arif Patel
>
>
>
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> Somebody email this guy: RAMESH@ALPHADXB.COM
>
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Received on Wed Nov 20 09:43:00 2002