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How can I calculate pipe wall thickness under external pressure?

How can I calculate pipe wall thickness under external pressure?

How can I calculate pipe wall thickness under external pressure?

(OP)
Hi everyone :D

I have question about pipe wall thickness under external pressure condition.

I know it can be calculated in accordance with ASME BPVC SEC VIII - UG 28.

In this code, I must determine factor "A" and "B", and it can be determined in ASME SECTION II -1.

But, sometimes I cannot determined factors because Do/t or L/Do do not exist in the table G (in the ASME SECTION II- Subpart 3)

In this situation, what is the best way to determine the factor A & B?

Plz, help me.

Best regards, Moong.

RE: How can I calculate pipe wall thickness under external pressure?

If this is for a pipe or pipeline you cold try DNV OS F101 for subsea pipelines which looks at collapse pressures.

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

RE: How can I calculate pipe wall thickness under external pressure?

(OP)
Thank you for reply @LittleInch :)

RE: How can I calculate pipe wall thickness under external pressure?

Moong-

Or... You could read VIII Div. 1 UG-28, and then review charts in Section II Part D. Specifically, UG-28(c)(1)(step 2) and UG-28(c)(2)(step 1 or step 2).

RE: How can I calculate pipe wall thickness under external pressure?

Hello Moong....

Could you give more specific details so that other members can provide help.

Regards
PME

Hard Work with Smartness is the key to success

RE: How can I calculate pipe wall thickness under external pressure?

Collapse is a routine calculation for casing and tubing ; Look in API standards ( I don't remember the exact document ).

RE: How can I calculate pipe wall thickness under external pressure?

Back in 2011, I did a calculation comparison of estimated collapse pressures for 4" SCH 40 pipe using (1) Timoshenko's Formula; (2) Haagsma's Equation; (3) ASME's approach. What I found was that, as is done by L.C. Peng in his book, if you apply a safety factor of 3.0 to Timoshenko's Formula and Haagsma's Equation, the three approaches yield nearly identical results. I didn't apply it across a range of diameters and thicknesses, but the equations lend themselves nicely to EXCEL (or, presumably, MathCad), and they might be a good place to start.

There is a good paper, OMAE'99, PL-99-5033, BENDING MOMENT CAPACITY OF PIPES by Soren Hauch and Yong Bai, that outlines the calculations.

RE: How can I calculate pipe wall thickness under external pressure?

Good info, Snorgy!

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