Filter to absorb CO2 from air for a demin water tank
Filter to absorb CO2 from air for a demin water tank
(OP)
I need to install a filter in the vent connection of two atmospheric (API) tanks used one for doinized water and the other one for demineralized water.
The intention is to avoid CO2 present in the air entering the tank.
Need to know how to design or specify it, absorbent material and name of possible suppliers.
The intention is to avoid CO2 present in the air entering the tank.
Need to know how to design or specify it, absorbent material and name of possible suppliers.





RE: Filter to absorb CO2 from air for a demin water tank
This protection has proved very effective
RE: Filter to absorb CO2 from air for a demin water tank
I know of at least two or three plants near us that have filters for this tanks.
I used automatic controlled N2 blanketing in process water tanks to avoid inlet of Air not in demin water tanks.
Do you use it in an automatic controlled way or just put a N2 hose and vent the exhausted N2 through the vent connection (this was the proven by our utilities operators)?
can you tell me how does your system work ?
The purge is constant to the atmosphere or are you controlling the inside pressure of the tank ?
RE: Filter to absorb CO2 from air for a demin water tank
there is no pressure control in the tank, the flow is adjusted by checking if there is a light flow coming out from the vent.
The only drawback of protecting tanks in such manner is that N2 is costly and should not be wasted...
Hope that the information is valuable enough.
RE: Filter to absorb CO2 from air for a demin water tank
RE: Filter to absorb CO2 from air for a demin water tank
1) Make the vent fairly large (4" exit 6" pipe). Dont use any block valves or equivalent. You could specify a spectable blind in the flange if somebody insists on a way to close of the vessel - but if you install a block valve then you will have to install a burting disc or RV and then it gets a lot more complivated
2) Make flowing velocity in the area around 0.1 m/s
3) Use a neddle valve and a rotary type flow meter (install the meter downstream of the valve) to control flow.
4) Use area of vent exit (4") to calculate required vol flow of N2.
5) If N2 flow is critical the you could also install a flow switch on the N2 line.
Best Regards
Morten