Urea Storage Tank Material

[Doiscond]

I have been trying to determine what storage/transfer material options exist for 40% urea, kept at ambient/atmospheric conditions. There is a wealth of information online relating to materials needed for the high temperature/pressure production of urea, but I have not found much else for lesser conditions. I wouldn't want to spec a higher grade and more expensive material if it's not needed.

If anyone has any sources of information or verification of an existing system operating without issue that would be very helpful.

Thanks!

 

[EdStainless]

How large of a tank are we talking?
What are the purity requirements?
What will be your temperature control?

 

[Doiscond]

Still in the estimate phase of the project, but plan so far is a roughly 12k gallon tank for an industrial grade application. Temp control is dependent on material, if it's a steel tank then we'd have a half pipe jacket to keep it from salting out when the temp outside drops.

 

[TugboatEng]

Polypropylene is the least problematic and lowest cost tank type. You will need to prevent temperatures from dropping below 40°F. In my region that's not a problem, even without insulation. Urea is non-conductive so you can't use galvanic or impressed current corrosion protection. The tank needs to be built from corrosion resistant materials.

 

[Doiscond]

If it were to be made out of steel, would 304L be sufficient then?

 

[EdStainless]

I see non-metallic as the best first option.
You may need to have a steel frame fully enclosing it for support.
How clean is your Urea?
How clean do you have to keep it?
What is the external environment?