Min. Thickness of exchanger tube
Min. Thickness of exchanger tube
(OP)
Hi all,
I am trying to calculate the minimum thickness of an exchanger tube under internal pressure. For this I am using ASME Section VIII Div 1. I am using an already designed piece of equipment to ensure that I am using the correct formulas. However I am bit confused as the ASME code is giving me a slightly different formula than the design calculation from the equipment.
I have uploaded the design calculation (document.pdf)
I redid the calculation using mathcad but this gives me a different min thickness than the design one (query.pdf)
And finally I did the calculation using the asme formula (asme.pdf)
I am not sure which formula to use here or if I am using the wrong code.
I am trying to calculate the minimum thickness of an exchanger tube under internal pressure. For this I am using ASME Section VIII Div 1. I am using an already designed piece of equipment to ensure that I am using the correct formulas. However I am bit confused as the ASME code is giving me a slightly different formula than the design calculation from the equipment.
I have uploaded the design calculation (document.pdf)
I redid the calculation using mathcad but this gives me a different min thickness than the design one (query.pdf)
And finally I did the calculation using the asme formula (asme.pdf)
I am not sure which formula to use here or if I am using the wrong code.





RE: Min. Thickness of exchanger tube
Review UG-27(c)(1) and UG-27(c)(2), and see alternative formulae in Appendix 1-1. I'd expect your required thickness to be something less than 2mm, even if you use a value <1 for E.
-TJ Orlowski
RE: Min. Thickness of exchanger tube
RE: Min. Thickness of exchanger tube
RE: Min. Thickness of exchanger tube
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Min. Thickness of exchanger tube
Also once typed in MathCad, it will convert it to one common set of units (SI in this case) and then convert giving the output in SI. So even if I type it in imperial units, it should give me the same output whether I have all in SI units or whatever units.
RE: Min. Thickness of exchanger tube
Old equations have to extremely carefully examined to determine whether there were shortcuts taken for empirical reasons or for convenience. Why it is 40 is not clear, though.
TTFN

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RE: Min. Thickness of exchanger tube
Right well document.pdf is from the vendor's documentation where my confusion lies, but I understand now, all the values are meant to be put in as is not to be converted to SI and then input.