ASME B16 pdf download Gray Iron Pipe Flanges and Flanged Fittings Classes 25, 125, and 250 3 PRESSURE–TEMPERATURE RATINGS 3.1 General Pressure–temperature ratings are maximum allowable workingpressures in bar (psi) units atthe temperature in degrees Celsius (Fahrenheit) shown in Tabl 3.1-1 for the applicable material and class designation. For inter- mediate temperatures, linear interpolation is permitted. Interpolationbetweenclass designations isnotpermitted. 3.2...