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Enclosed Tank Ventilation Criteria

Enclosed Tank Ventilation Criteria

Enclosed Tank Ventilation Criteria

(OP)
I'm trying to find data that shows suggested enclosed tank (tank with a lid) ventilation criteria.  The process tanks I'm trying to ventilate have lids and an overflow.  

How the ventilation works is, air is drawn in through the tank overflow, sweeps the surface of the tank and then is exhausted with a centrifugal fan.  

Each tank has a different process makeup from kerosene to sulphuric acid to water.  Furthermore, each process tank releases high amounts of radon progeny that must be vented.

I have found copius amounts of data suggesting what flow rates are adequate for OPEN tanks and fume hoods, etc.  but no data for enclosed tanks.

Any help is greatly appreciated!

Snipe

RE: Enclosed Tank Ventilation Criteria

What is the purpose of ventilating the enclosed tanks since no one is in the tanks?

RE: Enclosed Tank Ventilation Criteria

(OP)
The purpose of ventilating the tanks is that radon gas is constantly being emanated from the process.  More importantly, radon progeny is produced and this contributes to worker exposure.

Most of tanks are not in secondary confinement so they can't be ventilated with only makeup air.  There is mixing of various acids and bases, all of which have a vapour pressure.

The question I have is, how much local ventilation is necessary?

Snipe

RE: Enclosed Tank Ventilation Criteria

If the tank is enclosed, then there is no radon exposing the workers.  When the lid is opened than it is a different matter, so you should figure out the radon generation rate during the chemical reaction and then determine the amount of make up air so that the radon level is below the exposure limit when the tank lid is opened. Use the mass rate equation to figure out the rate of make up air flow, ie, Mass rate of contaminated air out= Mass rate of make up air minus Generated mass of contaminant; mass of contaminant to be removed = mass of contaminant from the chemical reaction minus acceptable mass of contaminantsleft in the tank.

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