vsd process control

[ronlivings]

Hi guys,
I think my question couldnt be understood properly,
I have a vsd for a reflux pump,pumping both to column,
and tank. How one can control speed of pump, is it possible
control it properly ..say top of column min 11 bar and lpg tank 7 bar.Before vsd pump was producing 16 bar. What is the
best applications of vsd ; only one line a control valve on it, or is it possible brances operation..

Regards

 

[JohnGP]

Without getting into a debate on the pros and cons of using VSD over other forms of process control, logically you should be able to control the column flow with the VSD, with a control valve in the line to the LPG tank with its lower pressure. But it depends on what you really need to control.

Cheers,
John