Page 279 - Valve Selection Handbook

266 Valve Selection Handbook

Table 7-3
Superheat Correction Factors K$H

RELIEViNG* TOTAL TEAJPERATLJRE SUF ERHEATEDSTSAM
PRESSURE 400F 450F SOOF 650F 600F 650F 700F 750F SOOF 850F 900F 950F 1000F 10SOF
psla bara kPaa (204C) (232C) (260C) (288C) (31 6C) (343C) (371C) (399C) (427C) (454C) (482C) (51 OC) (538C) (S66C)
50 3.4 340 .987 .957 .930 .905 .882 .861 .841 .823 .805 .789 .774 .759 .745 .732
100 6.9 690 .998 .963 .935 .909 .885 .864 .843 .825 .807 .790 .775 .760 .746 .733
150 10.3 1030 .984 .970 .940 .913 .888 .866 .846 .826 .808 .792 .776 .761 .747 .733
200 13.8 1380 .979 .977 .945 .917 .892 .869 .848 .828 .810 .793 .777 .762 .748 .734
250 17.2 1720 .972 .951 .921 .895 .871 .850' .830 .812 .794 .778 .763 .749 .735
300 20.7 2070 .968 .957 .926 .898 .874 .852 .832 .813 .796 .780 .764 .750 .736
350 24.1 2410 .968 .963 ,930 .902 .877 .854 .834 .815 .797 .781 .765 .750 .736
400 27.6 2760 .963 .935 .906 .880 .857 .836 .816 .798 .782 .766 .751 737
450 31.0 3100 .961 .940 .909 .883 .859 .838 .818 .800 783 .767 .752 .738
500 34.5 3450 .961 .946 .914 .886 .862 .840 .820 .801 .784 .768 .753 .739
550 37.9 3790 .962 .952 .918 .889 .864 .842 .822 .803 .785 769 .754 .740
600 41.4 4140 .964 .958 .922 .892 .867 .844 .823 .804 .787 .770 .755 .740
650 44.8 4480 .968 .958 .927 .896 .869 .846 .825 .806 .788 .771 .756 .741
700 48.3 4830 .958 .931 .899 .872 .848 .827 .807 .789 .772 .757 .742
750 51.7 5170 .958 .936 .903 .875 .850 .828 .809 .790 .774 .758 .743
800 55.2 5520 .960 .942 .906 .878 .852 .830 .810 .792 .774 .759 .744
850 58.6 5860 .962 .947 .910 .880 .855 .832 .812 .793 .776 760 744
900 62.1 6210 .965 .953 .914 .883 .857 .834 .813 .794 .777 .760 .745
950 65.5 6550 .969 .958 .918 .886 .860 .836 .815 .796 .778 .761 .746
1000 69.0 6900 .974 .959 .923 ,890 .862 .838 .816 .797 .779 .762 .747
1050 72.4 7240 .960 .927 893 .864 .840 .818 .798 .780 .763 .748
1100 75.8 7580 .962 .931 .896 .867 .842 .820 .800 .781 .764 .749
1150 79.3 7930 .964 .936 .899 .870 .844 .821 .801 .782 .765 .749
1200 82.7 8270 .966 .941 .903 .872 .846 .823 .802 .784 .766 .750
1250 86.2 8620 .969 .946 .906 .875 .848 .825 .804 .785 .767 .751
1300 89.6 8960 .973 .952 .910 .878 .850 .826 .805 .786 .768 .752
1350 93.1 9310 .977 .958 .914 .880 .852 .828 .807 .787 .769 .753
1400 96.5 9650 .982 .963 .918 .883 .854 .830 .808 .788 .770 .754
1450 100.0 10000 .987 .968 .922 .886 .857 .832 .809 .790 .771 .754
1500 103.4 10340 .993 .970 .926 .889 .859 .833 .811 .791 .772 .755
1550 106.9 10690 .972 .930 .892 .861 .835 .812 .792 .773 .756
1600 110.3 11030 .973 .934 .894 .863 .836 .813 .792 .774 .756
1650 113.8 11380 .973 .936 .895 .863 .836 .812 .791 .772 .755
1700 117.2 11720 .973 .938 .895 .863 .835 .811 .790 .771 .754
1750 120.7 12070 .974 .940 .896 .862 .835 .810 .789 .770 .752
1800 124.1 12410 .975 .942 897 .862 .834 .810 .788 .768 .751
1850 127.6 12760 .976 .944 .897 .852 .833 .809 .787 .767 .749
1900 131.0 13100 .977 .946 .898 .862 .832 .807 .785 .766 .748
1950 134,5 13450 .979 .949 .898 .861 .832 .806 .784 .764 .746
2000 137.9 13790 .982 .952 .899 .861 .831 .805 .782 .762 .744
2050 141.3 14130 .985 .954 .899 .860 .830 .804 .781 .761 .742
2100 144.8 14480 .988 .956 .900 .860 .828 .802 .779 .759 ,740
2150 148.2 14820 .956 .900 .859 .827 .801 .778 .757 .738
2200 151.7 15170 .955 .901 .859 .826 .799 .776 .755 .736
2250 155.1 15510 .954 .901 .858 .825 .797 .774 .753 .734
2300 158.6 15860 .953 .901 .857 .823 .795 .772 .751 .732
2350 162.0 16200 .952 .902 .856 .822 .794 769 .748 .729
2400 165.5 16550 .952 .902 .855 .820 .791 .767 .746 .727
2450 168.9 16890 .951 .902 .854 .818 .789 .765 .743 .724
2500 172.4 17240 .951 .902 .852 .816 787 .762 .740 .721
2550 175.8 17580 .951 .902 .851 .814 .784 .759 .738 .718
2660 179.3 17930 .951 .903 .849 .812 .782 .756 .735 ,715
2650 182.7 18270 .952 .903 .848 .809 .779 .754 .731 .712
2700 186.2 18620 .952 .903 .846 .807 .776 .750 .728 .708
2750 189.6 18960 .953 .903 .844 .804 .773 .747 .724 .705
2800 193.1 19310 .956 .903 .842 .801 .769 .743 .721 .701
2850 196.5 19650 .959 .902 .839 .798 .766 .739 .717 .697
2900 200.0 20000 .963 .902 .836 .794 .762 .735 .713 .693
2950 203.4 20340 .902 .834 .790 .758 .731 .708 .688
3000 206.9 20690 .901 .831 .786 .753 .726 .704 .684
'Relieving pressure is the valve set pressure plus the overpressure plus the atmospheric pressure (14.7 psia, 1.014 bara or 101.4 kPaa.)
(Table Courtesy ofSempell, Source Engineering Handbook KS 30.593 E)