3 replies to this topic

[Chemitofreak]

Hello Friends,

I have a system in which a column(A) top vaopurs are fed to another column( B ).

During abnormal operation, if column(A) gets pressurised, column(A) top gases are also routed to the Fuel Gas System (Refer attachment for the scheme).

Can anyone guide me in sizing the control valve on the fule gas line (refer sketch for details). I mean what shall be the basis for sizing. I am intereseted in the approach/concept for sizing the pressure control valve.

Thanks in advance.

Attached Files

•  Control_Valve_Sizing.pdf   604.06KB   75 downloads

Edited by Chemitofreak, 28 September 2015 - 02:57 AM.

[Bobby Strain]

You have all the information. We know nothing, so can be of little help to you.

 

Bobby

[latexman]

Big enough so pressure does not keep rising in Column A, and small enough that Column A contents are not dumped into the fuel gas system.

[fallah]

Chemitofreak,

 

This PV is normally closed and shall be designed in order to guarantee the highest rangability in the specified range...using relevant material balance, basis of design are as follows:

 

Maximum not controlled flow which shall pass through the PV in full open condition (choke flow):  100% of highest flow case (might be summer case)

 

Maximum flow: 55%-65% of the maximum not controlled flow case (it might a mechanical stop being used to limit the flow at this value)

 

Minimum flow: The flow at turndown conditions (e.g. 5%-10% of maximum not controlled flow case)