Thank you BigInch.
Now, if I consider a pressure of 1100psi for saturated steam, this corresponds to a temperature of 556 F. If I intend to use ANSI 600, entering the table based on my temperature, I would have these values
T1= 500 F, P1= 1200 psig and
T2= 600 F, P2= 1095 psig).
Should just...