Difference between the Max. Allowable Stress values and Design Stress Intensities (Sm)?

[Khalid Hameed]

Refer ASME BPVC SEC II Part D, Subpart 1 Stress Tables , TABLE 1A (Max. Allowable Stress Values for ferrous materials) & Table 2A (Design Stress Intensities). I want to know the difference in results we obtained by using each of them and what is their actual difference from theoretical point of view.

 

[Trestala]

Refer to Mandatory Appendix 1 and 2 of the same Section/Part for the derivation of the values.

 

[IdanPV]

All information appears in the header of these tables.

TABLE 1A:


TABLE 2A:

 

[Khalid Hameed]

All information appears in the header of these tables.

TABLE 1A:
View attachment 1797

TABLE 2A:
View attachment 1798

Thanks for sharing !

 

[GD2]

Refer ASME BPVC SEC II Part D, Subpart 1 Stress Tables , TABLE 1A (Max. Allowable Stress Values for ferrous materials) & Table 2A (Design Stress Intensities). I want to know the difference in results we obtained by using each of them and what is their actual difference from theoretical point of view.

To reply to your question, first I will give you an assignment.
Calculate the Principal Stresses (Rankine), Max shear stress (TRESCA) and Von Mises stress for the following problem:
NPS 16, 0.375 inch wall thik pipe operating at 1000 Psig internal pressure?