5 replies to this topic

[racerX]

Hi all

I need help in sizing of a knockout drum.

I tried sizing a vertical knockout drum with demister pad using 2 methods - settling velocity and k factor (GPSA databook) - but got completely different results. The conditions are as follows:

gas density: 3.3 kg/m3
liq density: 1000 kg/m3
gas volumetric flowrate: 10 m3/s
viscosity: 0.012 cp
diameter of particle: 100 microns

Also, could you let me know how do we go about calculating the length once the diameter has been calculated?

Any help is appreciated

[Root]

RacerX,

Where you find difference during your calculation, use EXXON standard for drum sizing, it will give you simple directions for calculations.calculate critical velocity and calculate area by dividing flow over critical velocity. Moreover, you are calculating the vessel size or mechanically designing the vessel, if mechanically designing then you need lot of calculations but if process side then you need to calculate vessel area and PS,s etc. mechanical design include inlet nozzle, outlet nozzle, manway, vessel thickness, inlet/outlet piping also.

One thing you miss in your parameters, what is liquid flow, you mention total, for calculation of area you need gas as well as liquid flow also.

Toor

[breizh]

Hi ,
let you try the search button , right hand side, you will find a lot of information.
Breizh

[breizh]

Hi ,
An other resource which should support your query.

Hope this helps
Breizh

[asade abiodun]

Hi ,
An other resource which should support your query.

Hope this helps
Breizh

Hi Breizh,

I downloaded the attached document,Section 9:Flare Knock-out Drums refers me to IPS-E-PR-460 for detail sizing procedures. I would appreciate if you can send me the document if it is within your strength to ashjanj18@yahoo.com because i need deatil information on how i can have a reasonable design for the flare KO drum required at the Booster station we are designing.

Thanks for your anticipated cooperation.
Asade

[breizh]

Hi,
Hope it helps
Breizh