Non circular section tanks

[ZGZtanker]

Good morning,

We are working on a tank container prototype. The MAWP would be below 0.5 bar (7.35 psi). The section of the tank is not circular, it is "more squared".
Does ASME code give any formula or criteria for calculation of these kind of tanks?

I attach a sketch just to show the tank section

http://files.engineering.com/getfil...26-46cf-866e-e60ed51edbf1&file=tank_shape.JPG

Best regards

 

[gdubyuh]

Appendix 13 of ASME Sect. VIII, Div. 1 provides minimum design requirements for non-circulcar cross section vessels.

Sketch 3 of Fig. 13-2(a) looks like the cross-section of the tank in your file (square or rectangular cross-section with corners bent to a specified radius). Or, sketch 5 would be appropriate if you need to included external reinforcing bars.

Section 13-7(c)provides stress equations for sketch 3. Section 13-8 provdies the stress equations for sketch 5, along with reinforcment spacing criteria.

 

[gdubyuh]

Or maybe not, since the sides of the vessel are not exactly 'straight'. They have a bit of a bend to them as well.

 

[ZGZtanker]

First of all, thank you for your answers.

I have been reading Appendix 13 and it seems it provides formulas for some specific tank shapes. For different shapes it points to U-2 and UG-101.
I understand the tank could be calculated using FEA and then tested according to UG-101 to validate the MAWP. Am I right?

Does anybody have some experience with these steps that could be shared?

Best regards

 

[jte]

ZGZ-

You're going a bit too far: If you qualify the design using U-2(g) and an FEA (generally done in accordance with VIII Div. 2) then you do not need to proof test the product. For this geometry, I would expect substantial deflections and thus would recommend a nonlinear FEA (even though the stresses may be linear).

If you are planning to mass-produce these tanks, it may be worth the expense to proof test as well, but that would be at your option.

If these are transport tanks, have you considered using ASME XII instead of VIII? I'm not personally familiar with XII, but I've heard it described as "Section VIII light". It may be more directly applicable to your project.

jt

 

[LSThill]

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Non-Circular Pressure Vessels square



L S THILL