control valve selection

[shahabemk]

Hi all
I am working for a revamp project for crude disstilation unit.
The atmospheric column has two side stripper. Level controler of stripper botton send signal to a control valve of draw off line to stripper.
Which type is suitable for this stream' butterfly or globe valve type ?
Best Regards
shahabemk

 

[Latexman]

What's the line size?

Good Luck,
Latexman

 

[EdStainless]

Is the valve either open or closed, or are you expecting some metering?

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P.E. Metallurgy

 

[georgeverghese]

If the over head vapor stream from the side stripper returns to the CDU main column a few trays higher up, then available dp for this control valve wouldnt be much at all, and so a low dp butterfly CV would be better. But check that the CV has sufficient turndown capability to suit the side stripper turndown.

 

[shahabemk]

Thank you all

line size of kerosene draw off to the stripper is 6 " and for gas oil stripper is 12 "

 

[hacksaw]

Rotary valves (control disk) work fine, its low d/p service so cavitation is not an issue.

Work closely with piping design layout.

 

[shvet]

For this service we used globe valve or ball valve with V-port depending on pressure drop available and difference of actual inlet/outlet pressure and vapor pressure. Layout and elevation of piping are critical.