API - Leser

GeneralLEOS/GThis table is based on the rated coefficient of discharge for steams and gases of LESER safety valves certified by ASME.The appropriated K-values are shown in the column “K-value” of the table.LEO S/G [inch 2 ] = A 0 [inch 2 ] . ( K ) 0,975LEOS/GLESER Effective Orifice (for steam, gas and vapor)Orifice acc.API 526Flangerating classValve size d 0 [inch] d 0 [mm] K-valueLEOS/G[inch 2 ]% of higherorifice% of lowerorificeD 0,110 100,0% 100,0%150 – 600 1 D 2 0,551 14,0 0,455 0,111 56,8% 101,2%900 – 1500 1 1 / 2 D 2 0,551 14,0 0,455 0,111 56,8% 101,2%2500 1 1 / 2 D 3 0,551 14,0 0,455 0,111 56,8% 101,2%E 0,196 100,0% 100,0%150 – 600 1 E 2 0,551 14,0 0,801 0,196 63,9% 100,0%900 – 1500 1 1 / 2 E 2 0,551 14,0 0,801 0,196 63,9% 100,0%2500 1 1 / 2 E 3 0,551 14,0 0,801 0,196 63,9% 100,0%F 0,307 100,0% 100,0%150 – 600 1 1 / 2 F 2 0,709 18,0 0,801 0,324 64,4% 105,5%900 – 2500 1 1 / 2 F 3 0,709 18,0 0,801 0,324 64,4% 105,5%G 0,503 100,0% 100,0%150 – 900 1 1 / 2 G 3 0,886 22,5 0,801 0,506 64,5% 100,7%1500 – 2500 2 G 3 0,886 22,5 0,801 0,506 64,5% 100,7%H 0,785 100,0% 100,0%150 – 300L 1 1/ 2 H 3 1,114 28,3 0,801 0,801 62,2% 102,0%300 – 1500 2 H 3 1,114 28,3 0,801 0,801 62,2% 102,0%J 1,287 100,0% 100,0%150 – 300L 2 J 3 1,417 36,0 0,801 1,296 70,5% 100,7%300 – 1500 3 J 4 1,417 36,0 0,801 1,296 70,5% 100,7%K 1,838 100,0% 100,0%150 – 600 3 K 4 1,693 43,0 0,801 1,849 64,8% 100,6%900 – 1500 3 K 6 1,693 43,0 0,801 1,849 64,8% 100,6%L 2,853 100,0% 100,0%150 – 300L 3 L 4 2,106 53,5 0,801 2,863 79,5% 100,3%300 – 1500 4 L 6 2,106 53,5 0,801 2,863 79,5% 100,3%M 3,600 100,0% 100,0%150 – 900 4 M 6 2,374 60,3 0,801 3,637 83,8% 101,0%N 4,340 100,0% 100,0%150 – 900 4 N 6 2,598 66,0 0,801 4,357 68,3% 100,4%P 6,380 100,0% 100,0%150 – 900 4 P 6 3,150 80,0 0,801 6,401 57,9% 100,3%Q 11,050 100,0% 100,0%150 – 600 6 Q 8 4,154 105,5 0,801 11,132 69,6% 100,7%R 16,000 100,0% 100,0%150 6 R 8 4,980 126,5 0,801 16,004 61,6% 100,0%300 – 600 6 R 10 4,980 126,5 0,801 16,004 61,6% 100,0%T 26,000 100,0% 100,0%150 – 300 8 T 10 6,358 161,5 0,801 26,085 100,3%00/09 LWN 480.01-E