Storage tanks bottom types

[carletes]

Dear all,

I have seen storage tanks (crude oil, diesel, kerosene,..) which have different bottom types: some of them have conical shape (slope approx. 1:120) with the tank center being the highest point and a drawoff sump near the shell but in other cases the bottom has inverted conical shape with the tank center being the lowest and a drawoff sump in that center.
Does anybody knows the advantages/disadvantages of each solution?

Best regards and thank you

 

[pennpiper]

carletes,
Take a walk around this website and see if you can find some answers.
If you don't find the answer there on your own then ask them.

 

[pennpiper]

OOOps
forgot to post the website

http://www.cbi.com/services/flat-bottom-tanks-ambient-storage.aspx

 

[niyeki]

In the design of the tanks the selection of the type of the bottom is mostly related with the diameter of the tank. what is your tank diameter
regards

 

[carletes]

Hello again,

The tanks I am working are:

Crude oil storage: diameter 65 m
kerosene: diameter 40 m
Diesel: 64 m
Gasoline: 45 m
Naphta: 30 m

Regards

 

[0707]

Tank Bottoms and drainage points

The drain port should be located at the lowest point of the tank. This will prevent oil at the bottom of the tank from becoming stagnant and collecting heavy contaminants, sediment and water. It is helpful if the bottom slope is between 1:10 to 1:30. While sloped or flat-bottom tanks are the most common, conical- or funnel-bottom tanks are the best to prevent accumulation of sludge and water and are preferred by many.

 

[djack77494]

My own preference is to have the low point and drain in the center. Unfortunately this, like a generous slope allowance, is not always practical for large storage tanks.

 

[kerrdog]

Be careful with center drain low points. Depending on the foundation design and secondary containment, the center drain could hold moisture underneath the tank and cause accelerted corrosion and early bottom failure.