Superheat Correction Factor

Written by Jerry Ratzlaff. Posted in Thermodynamics

The table below is used to calculate the superheat correction factor, Ksh when sizing a relief valve in steam service:

Set PressureTemperature (degrees Fahrenheit)
40 1.00 0.99 0.93 0.88 0.84 0.81 0.77 0.74 0.72 0.70
60 1.00 0.99 0.93 0.8S 0.84 0.S1 0.77 0.75 0.72 0.70
80 1.00 0.99 0.93 O.S8 0.84 0.81 0.77 0.75 0.72 0.70
100 1.00 0.99 0.94 0.89 0.84 0.81 0.77 0.75 0.72 0.70
120 1.00 0.99 0.94 0.89 0.84 0.81 0.78 0.75 0.72 0.70
140 1.00 0.99 0.94 0.89 0.85 0.81 0.78 0.75 0.72 0.70
160 1.00 0.99 0.94 0.89 0.S5 0.81 0.78 0.75 0.72 0.70
180 1.00 0.99 0.94 0.89 0.85 0.81 0.78 0.75 0.72 0.70
200 1.00 0.99 0.95 0.89 0.85 0.81 0.78 0.75 0.72 0.70
220 1.00 0.99 0.95 0.89 0.85 0.81 0.78 0.75 0.72 0.70
240 - 1.00 0.95 0.90 0.85 0.81 0.78 0.75 0.72 0.70
260 - 1.00 0.95 0.90 0.85 0.81 0.78 0.75 0.72 0.70
280 - 1.00 0.96 0.90 0.85 0.81 0.7S 0.75 0.72 0.70
500 - 1.00 0.96 0.90 0.85 0.81 0.78 0.75 0.72 0.70
550 - 1.00 0.96 0.90 0.86 0.82 0.78 0.75 0.72 0.70
400 - 1.00 0.96 0.91 0.86 0.82 0.7S 0.75 0.72 0.70
500 - 1.00 0.96 0.92 0.86 0.82 0.78 0.75 0.73 0.70
600 - 1.00 0.97 0.92 0.87 0.82 0.79 0.75 0.73 0.70
800 - - 1.00 0.95 0.8S 0.83 0.79 0.76 0.73 0.70
1000 - - 1.00 0.96 0.89 0.84 0.78 0.76 73.00 0.71
1250 - - 1.00 0.97 0.91 0.85 0.80 0.77 0.74 0.71
1500 - - - 1.00 0.93 0.86 0.81 0.77 .0.74 0.71
1750 - - - 1.00 0.94 0.86 0.81 0.77 0.73 0.70
2000 - - - 1.00 0.95 0.86 0.80 0.76 0.72 0.69
2500 - - - 1.00 0.95 0.85 0.78 0.73 0.69 0.66
3000 - - - - 1.00 0.82 0.74 0.69 0.65 0.62