4 replies to this topic

[Geoffrey]

Here is a rule of thumb, that I found in a Excel workbook downloaded from the cheresources site, that has to do with drum vessels.

Optimum Length/Diameter ratio is usually 3, range is 2.5 to 5

Maybe it can help. I attach the workbook here.

Attached Files

•  exprules.xls   143KB   545 downloads

[pilot]

Here is a rule of thumb, that I found in a Excel workbook downloaded from the cheresources site, that has to do with drum vessels.

Optimum Length/Diameter ratio is usually 3, range is 2.5 to 5

Maybe it can help. I attach the workbook here.

Dear this excell file is not opening, Can you re-attch, its look like havingRead only & other errors....

[joker1]

I would like to know if there is any general thumb rule for stirred reactor height to diameter.

Thanks

The L/D ratio depends on the process involved. For example for a boiling CSTR used for polymers (high viscosity) you need a low L/D (say 1:1) supplemented by a disengagement head space to avoid polymer entrainment/ add cold material to quench a runaway reaction. So you end up with L/D of 1.5-2.

Having a higher L/D may cause the agitator shaft to be beefed up.

Bottom line is you have to use engineering judgment.