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L/D Ratio of storage tank

L/D Ratio of storage tank

L/D Ratio of storage tank

What is the significance of Choosing optimum L/D Ratio in Atmospheric storage tanks.?

As a normal practice the L/D ratio of atmospheric storage tank is considered within the limit of 0.5 to 1.1.
However, it is noticed that for some tanks it doesn't follow this limit. For example, fresh Amine storage tank.
Is there any fixed figure or whether it is optimized considering the plot plan, area available,wind load,civil work etc.

RE: L/D Ratio of storage tank


As is typical in most engineering design decisions......it depends.

IMHO, I do not believe that a simple answer is possible ...

This complex topic is typically referred to as the "Height to diameter" or "H/D" ratio. This important factor alone constitutes a strong reason to hire an experienced consultant tank design engineer.

The H/D tank design is affected by:

- Fixed or floating roof selection
- Soil conditions and foundation costs and foundation design selection
- Seismic conditions and allowable contents "slosh" under a seismic event
- Maximum design pressure
- Desired vapor space volume and tank venting requirements
- Minimum Fire protection distance requirements for combustible and flammable liquids
- Energy usage for tanks that are insulated and must be kept hot

- and other factors ....



Tell us more about the tank that you are designing ...

Sr. Process Engineer

RE: L/D Ratio of storage tank

This question would be better answered in the "Storage Tank Engineering" Forum ....

Sr. Process Engineer

RE: L/D Ratio of storage tank

Define "atmospheric storage tank" please.

Do you mean vertical cylindrical tanks or horizontal cylindrical tanks? (L/D implies horizontal "bullet" like tanks....)

What sort of volume / size are you looking at?

If you have the space, most vertical cylindrical tanks are bigger diameter than height.

however if you are squeezed for room then you can get around 2 for height / diameter, but generally only for fairly small tanks

Optimum between foundation / civil costs, steel costs and other issues (e.g. seismic, wind, snow, rain, fixed roof, floating roof etc will all vary by fluid contents, sites, ground conditions, space.

That's why design engineers exist - to design!

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: L/D Ratio of storage tank

Economical tank fabrication.

RE: L/D Ratio of storage tank

Thank you Every one, all response where informative.
I realise that, In main case "bimr" is on the money .
"Economical Tank fabrication", ie. all other tanks are site fabricated while these tanks are shop fabricated which makes the deference.

RE: L/D Ratio of storage tank

You are welcome MHRG, you are welcome ....

And thank you for reminding us why senior engineers eventually become despondent and abandon these fora ....

Sr. Process Engineer

RE: L/D Ratio of storage tank

I didn't mean to remind anything MJCronin. Apologize if you felt anything bad from me.
All the responses were 100% useful.

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