Bunded Area

[99491]

What capacity should a bunded area containing a number of different tanks be able to store? I have heard 110% of the capacity of the largest tank but cannot find it.

Please advise and also state where in which standard I can find this.

Thanks

 

[Bonswa]

Check out NFPA 30: Flammable and Combustible Liquids Code. Also check out NFPA 395 if it's for tanks less than 1,100 gallons.

 

[JStephen]

Where is the tank located? NFPA 30 is an American standard that may or may not apply to your location.

 

[99491]

Located in Kenya, East Africa.

 

[MJCronin]

99491..

Most storage tanks located in the USA use the 110% criteria for the bund (containment) design. It is incorporated into State statutes and laws.

Some US states also add a "rainfall factor" of about 6 inches to the wall height.

It is also important to consider the bund material (concrete, earth with a memebrane and clay are often used) as well as access to the contained area.

A bund containing a number of tanks of different volumes needs to be designed only for the failure of the largest one.

Regards

-MJC

 

[chicopee]

Not mentioned is that the 110% is based on volume of largest tank; also realize that this large tank would contain a certain amount of leaked product, so your calculations have to take that into account.
US EPA requires 110% (enforcable) or largest tank volume + 25 years,24 hours storm event (non-enforcable)