API Section 3.6.2 - max design stress vs design stress basis 1

[IFRs]

In API 3.6.2.1 it says that the maximum product design stress Sd is found in table 3.2. But then it says that Sd given by a different name "design stress basis" is arrived at via a calculation that (for A36 at least) comes out higher than the table 3.2. What is the definition of "design stress basis" and which Sd does one use?

 

[JoeTank]

For A36...
Use the lesser of Sd = (2/3) Yield or (2/5) Tensile.
(2/3)36000 = 24,000
(2/5)58000 = 23,200
Table shows 23,200 for Sd

Joe Tank