Dear sirs.
I'm trying to calculate by hand the required wall thickeness as per formula (34a) and (34b).
I understand that if we have internal corrosion, formula 34b shall be used.
In this formula we have inside diameter.
1) Is this the formula used by CAESAR II when dealing with B31.3 IX?
2) the Code specifies: "in accordance with this Chapter, the inside diameter of the pipe is the maximum value allowable under the specificiations"
What does it mean? How can I calculate the value of d?
I apologize if the question is trivial.
Best regards