We have a 5000 US gal tank for aqua ammonia storage. We fill this tank from tanker truck by air compressor. Filling is finished in 30 minutes. The storage tank has a ball check valve, as a over-pressure release vent.

I want to design an exhaust for this tank with ammonia absorber. I have not been in touch with design aspects of this kind. I would appriciate your ideas for this need.

If you dont have in-house facilities you should get in contact with a consult. Stuff from these pages could hardly pass a normal QA review even though there are many competent ppl. around.

You shouldn't be filling the tank above 85% liquid level.  You should have a level alarm high that stops the filling process.  There should also be a tank pressure and tank level indicator at the unloading station.

ANSI K61.1 is a guideline for anhydous ammoina storage systems and we have adopted it for our aqueous ammonia systems. 

It sounds like you are filling the tank so that it opens the relief valve and over flows with liquid.  You should stop filling at the 85% level, per ANSI K61.1, and also display pressure at the unloading station so the operator can be sure not to open the pressure relief valve.

By doing this, you won't need an ammonia absorber.

check valve

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