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Anonymous Poster

Underground Storage Tanks

12/11/2007 4:22 PM

I am designing an OWS (Oil/Water Separator) system. The OWS is a vaporization type. It is too far from the rest of the site to connect with piping, so we are going to use a UST. The only problem I am running in to is finding a 150 gallon (min.) tank that is designed to hold hot oil discharge adequately.

I keep finding information stating that a tank is either "double-walled" or "corrosion resistant" or "flame resistant," yet nothing about if the tank can handle contents entering at a temperature greater than 212 deg. Farenheit.

Any recommendations?

Thanks in advance.
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DVader1000
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#1

Re: Underground Storage Tanks

12/12/2007 1:05 AM

Have considered the use of a stainless steel tank? Preferably, it should be SS316, but SS304 might also be suitable.

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Zaphod2Headed
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#2
In reply to #1

Re: Underground Storage Tanks

12/12/2007 10:23 AM

Hi DVader 1000,

Curiosity question, why stainless? If all you want to do is contain hot oil, would not a mild steel tank perform just as adequately, but at a lower cost?

Just wondering.

IPG

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DVader1000
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#5
In reply to #2

Re: Underground Storage Tanks

12/12/2007 11:15 PM

"Curiosity question, why stainless?"

Because the tank is to be located underground. Groundwater is high in dissolved minerals and will have a corrosive effect on mild steel; stainless steel is much better able to resist this effect. Also, the hot oil also contains water vapor; hot water vapor also has a corrosive effect on mild steel.

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Zaphod2Headed
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#6
In reply to #5

Re: Underground Storage Tanks

12/13/2007 10:24 AM

Makes sense !

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EnviroMan
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#3

Re: Underground Storage Tanks

12/12/2007 12:16 PM

My guess is that any double-walled steel tank would suffice (although 275 US gal is a standard size, I don't think 150 gal is). W/o knowing where you are located, I won't make any supplier recommendations, but there are numerous. BTW, the "double walled" is to provide secondary containment for releases, and "corrosion resistant" is to maintain integrity from acidic soil conditions. A real question, though, is why/how does the oil attain >212 degF in a system needing an OW/S?

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Anonymous Poster
#4
In reply to #3

Re: Underground Storage Tanks

12/12/2007 2:37 PM

The vaporization method heats the condensate to separate the water from the oil. The water is boiled off and vented as steam, and what remains is hot oil. In an ideal world, the system will be cooled to a lower temperature before emptying to the storage tank. However, if the situation would arrise where it needed to be emptied ASAP and was still hot, I'd like to be sure that the tank could handle it.
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