Superheat Correction Factor

Superheat Correction Factor The table below is used to calculate the superheat correction factor, Ksh when sizing a relief valve in steam service.
Set Pressure	Temperature (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

Superheat correction factor, a dimensionless number, is an adjustment used in thermal and heat transfer calculations to account for the effect of vapor superheating on heat transfer performance. It is applied when a working fluid, such as steam or a refrigerant, is heated beyond its saturation temperature at a given pressure, entering the superheated vapor region. Because thermophysical properties like specific heat, density, and heat transfer coefficients change with superheat, calculations based solely on saturated vapor conditions can become inaccurate. The superheat correction factor modifies heat transfer rates, temperature differences, or coefficients so that models more closely represent real operating conditions. This factor is commonly used in the design and analysis of heat exchangers, boilers, condensers, and refrigeration systems to improve prediction accuracy and ensure reliable thermal performance when superheated vapors are present.