For B31.3 analysis, CAESAR II uses Fig 323.2.2B or Table 323.2.2B for temperature reductions.
Adapted from: B31.3 - 2018, Process Piping, Fig. 323.2.2B, Reduction in Lowest Exemption Temperature for Steels Without Impact Testing.
Unit conversion
For Tmin, base MDMT, and final MDMT, Fahrenheit converts to Celsius by:
°C = (5/9)(°F – 32)*
Reduction converts according to the Celsius/Fahrenheit ratio used on the horizontal axis of Figure 323.2.2B:
Reduction °C = (5/9)(Reduction °F)