ASME BPVC Section VIII Div. 2 Paragraph 4.10.3.1(C)
ASME BPVC Section VIII Div. 2 Paragraph 4.10.3.1(C)
(OP)
Paragraph 4.3.10.1 states the requirements for using the equations in Paragraph 4.3.10 to calculate the combined loading and allowable stresses. I understand 4.3.10.1(a) and (b) but I am slightly confused why 4.3.10.1(c) is there.
How does having an inside radius to thickness ratio less than three impact a pressure vessel?
Where did the value three come from?
I know later on in the book 5.2.1.3 states that vessels with R/t<4 should not be used because “nonlinear stress distributions associated with heavy wall sections (R/t<4) are not accurately represented by the implicit linear stress distribution”. is this reason the same for 4.3.10.1(C) and if so, why has the value changed from 3 to 4?
If anyone could shed some light on this requirement from 4.3.10.1(C) for me that would be greatly helpful.
Regards,
Tyler
How does having an inside radius to thickness ratio less than three impact a pressure vessel?
Where did the value three come from?
I know later on in the book 5.2.1.3 states that vessels with R/t<4 should not be used because “nonlinear stress distributions associated with heavy wall sections (R/t<4) are not accurately represented by the implicit linear stress distribution”. is this reason the same for 4.3.10.1(C) and if so, why has the value changed from 3 to 4?
If anyone could shed some light on this requirement from 4.3.10.1(C) for me that would be greatly helpful.
Regards,
Tyler





RE: ASME BPVC Section VIII Div. 2 Paragraph 4.10.3.1(C)
The two values you quoted should probably at the very least be consistent with each other. In my opinion, both numbers should be 5, but the 3 in 4.3.10 seems really pushing it.
Would you please submit an inquiry to the Code Committee on this matter. They should be looking into it b