## calculate the Internal area of a tube in an evaporizer

## calculate the Internal area of a tube in an evaporizer

(OP)

[b]Dear friends,

I am trying to calculate the Internal area of a tube in an evaporizer. I am using the formula (pi*D^2)/4, How to I determine the D? I understand that's the diameter of the tube.

Please help .

I am trying to calculate the Internal area of a tube in an evaporizer. I am using the formula (pi*D^2)/4, How to I determine the D? I understand that's the diameter of the tube.

Please help .

## RE: calculate the Internal area of a tube in an evaporizer

Is it an existing unit that you are inspecting? D would be based on on the tube outside diameter and the wall thickness...

## RE: calculate the Internal area of a tube in an evaporizer

If your walls are heavier and you want to correct the use pi*(D-2w)*L Where w is the nominal (ordered) wall thickness. The actual walls will be slightly less than this but you have no way of knowing the actual wall thickness.

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P.E. Metallurgy, consulting work welcomed

## RE: calculate the Internal area of a tube in an evaporizer

_{o}, d_{i}, and L should be on there, or it will define the nominal size and standard you need to refer to.Good Luck,

Latexman

## RE: calculate the Internal area of a tube in an evaporizer

## RE: calculate the Internal area of a tube in an evaporizer

## RE: calculate the Internal area of a tube in an evaporizer

What is N, Do, L. How do i find out the Do(assuming thats the outside diameter????

## RE: calculate the Internal area of a tube in an evaporizer

Do = od of tube - you will find this on the TEMA datasheet for the vaporiser

L = length per tube

Most heat exchanger TEMA datasheets would state explicitly the total heat exchange surface area also

## RE: calculate the Internal area of a tube in an evaporizer

The designer (you) has to decide what size tubes to use.

Too small and they may plug up easily. Too large and your heat transfer may be low. Any past experience from similar operations to guide you?

Good Luck,

Latexman

## RE: calculate the Internal area of a tube in an evaporizer

People use the sizes that they do because of the tradeoffs with thermal eff, hydraulic eff, and fabrication costs.

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P.E. Metallurgy, consulting work welcomed

## RE: calculate the Internal area of a tube in an evaporizer

MJCronin

Sr. Process Engineer

## RE: calculate the Internal area of a tube in an evaporizer

## RE: calculate the Internal area of a tube in an evaporizer

## RE: calculate the Internal area of a tube in an evaporizer

MJCronin

Sr. Process Engineer