Steam superheat correction factor

K,h = steam superheat correction factor from Table 7-7 Kn = Napier steam correction factor for set pressures between 1500 and 2900 psig from Table 7-6 K = Kj = coefficient of discharge ... 

Table 3. Superheat correction factors for safety valve in steam services.

Kn = correction for Napier equation = 1.0 when P, = 1515 psig = (0.1906P, - 1000)/ (0.2292P, - 1061) where Pj > 1515 psia and < 3215 psia, Table 7-6. Ksb = superheat correction factor, see Table 7-7. For saturated steam at any pressure, = 1.0 Pb = stamped bursting pressure, psia... 

For steam service at 10% overpressure, we use the following formula based on the empirical Napier formula for steam flow. Correction factors are included to account for the effects of superheat, backpressure and subsonic flow. An additional correction factor, Kn, is required by ASME when the relieving pressure (Pj) is higher than 1500psia (10.340kPaA). 

The steam sizing formulas are based on the flow of dry saturated steam. To size for superheated steam, the superheat correction factor is used to correct the calculated saturated steam flow to superheated steam flow. 

For saturated steam, Ksh = 1. When the steam is superheated, use Figure E. 1 and read the superheat correction factor under the total steam temperature column. 

Fired henteri and furnaces Cfldi CpFdftfFf/Y Fj is the superheat correction factor for Steam boilers (F,- = 1 for citiier heaters and furnaces) and is given by Fr = 1 + O.OD184iT-0.000003350 where AT b the amount of superheat in °C. 

Ksh = Capacity correction factor, due to the degree of superheat in the steam. For saturated steam, use Ksh= 1. For other values, see Appendix E... 

Ksh = Capacity correction factor, due to the degree of superheat in the steam. 

Figure 5.20). The correction factor depends on the degrees of superheat at the turbine inlet, and it is defined as the difference between the steam temperature and the saturation temperature. 

Cs superheat efficiency correction factor for a single stage or multistage steam-turbine... 

SH = superheat steam correction factor, obtained from Table 4.13. Table 4.13 has been developed based on Table 9 of API RP 520 in SI unit. Some differences will be observed because of rounding off. The value of Kg for saturated steam is 1. 

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