Type 441, 442 Full nozzle DIN Flanged Safety Relief Valves spring loaded Capacities The-Safety-Valve.com LWN 468.3-E
Approvals Approvals DN O 5 65 8 Actual Orifice diameter d [mm] 23 37 46 Europe Coefficient of discharge K dr DIN EN ISO 4126-1 Approval No. 722111Z8//8-2 S/G,7 L 5 Germany Coefficient of discharge α w AD 2-Merkblatt A2 Approval No. TÜV SV 576 S/G,7 L 5 United States Coefficient of discharge K ASME Sec. VIII Approval No. M3744 S/G,699 Approval No. M3755 L,521 Canada Coefficient of discharge K Canada: CRN Approval No. OG1182.9C S/G,699 L,521 China Coefficient of discharge α w CSBQTS Approval No. S/G,7 L 5 Russia Coefficient of discharge α w on request Classification societies on request LWN 488.1-E 6/17
Capacities Steam Capacities for saturated steam according to AD 2-Merkblatt A2, based on set pressure plus 1 % overpressure. Capacities at 1 bar (14,5 psig) and below are based on,1 bar (1,45 psig) overpressure. Metric Units AD 2-Merkblatt A2 [kg/h] Actual Orifice diameter d [mm] 23 37 46 LEO S/G * ) [inch 2 ] 62 1,195 1,847 Set pressure [bar] Capacities [kg/h],1 14 363 561,5 224 579 895 1 326 843 132 2 519 1343 275 3 699 188 2794 4 871 2254 3485 5 143 2699 4172 6 1214 3142 4856 7 1381 3574 5525 8 1551 414 625 9 1721 4454 6884 1 1891 4893 7562 12 223 577 8919 14 2562 6629 1247 16 29 755 116 18 3239 8382 12955 2 3578 926 14312 22 397 1111 15629 24 4247 1991 16988 26 4588 11873 18351 28 493 12757 19718 3 5272 13644 2189 32 5616 14534 22465 34 5945 15384 23779 36 629 16278 2516 38 6637 17175 26547 4 6985 1876 27939 Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 1% overpressure. Capacities at 2,7 bar (3 psig) and below are based on 7 bar (3 psig) overpressure. US Units ASME Section VIII [lb/h] Actual Orifice diameter d [inch],91 1,46 1,81 Actual Orifice area A [inch 2 ],644 1,667 2,576 LEO S/G * ) [inch 2 ] 62 1,195 1,847 Set pressure [psig] Capacities [lb/h] 15 757 1959 328 2 873 2259 3492 3 115 2859 4419 4 136 3519 5439 5 1615 4179 6459 6 187 4839 7479 7 2125 5499 8499 8 238 6159 9519 9 2635 6819 1539 1 289 7479 11559 12 34 8799 136 14 391 1118 1564 16 442 11438 1768 18 493 12758 1972 2 544 1478 2176 22 595 15398 238 24 646 16718 2584 26 697 1838 2788 28 748 19358 2992 3 799 2677 3196 32 85 21997 34 34 91 23317 364 36 952 24637 388 38 13 25957 412 4 154 27277 42161 42 115 28597 4421 44 1156 29917 46241 46 127 31236 48281 48 1258 32556 5321 5 139 33876 52361 55 14365 37176 57461 58 1513 39156 6521 * ) LEO S/G = LESER Effective Orifice steam/gas please refer to page /11 How to use capacity-sheets refer to page /9 6/18 LWN 488.1-E
Capacities Air Capacities for air according to AD 2-Merkblatt A2, based on set pressure plus 1 % overpressure at C and 113 mbar. Capacities at 1 bar (14,5 psig) and below are based on,1 bar (1,45 psig) overpressure. Metric Units AD 2-Merkblatt A2 [m n3 /h] Actual Orifice diameter d [mm] 23 37 46 LEO S/G * ) [inch 2 ] 62 1,195 1,847 Set pressure [bar] Capacities [m n3 /h],1 162 42 649,5 263 68 151 1 388 14 1552 2 627 1622 257 3 854 229 3414 4 171 2773 4286 5 1289 3337 5157 6 157 39 629 7 1725 4464 69 8 1943 528 7771 9 2161 5592 8643 1 2379 6155 9514 12 2814 7283 11257 14 325 8411 13 16 3686 9538 14743 18 4121 1666 16486 2 4557 11793 18228 22 4993 12921 19971 24 5429 1448 21714 26 5864 15176 23457 28 63 1634 252 3 6736 17431 26942 32 7171 18559 28685 34 767 19686 3428 36 843 2814 32171 38 8478 21941 33914 4 8914 2369 35657 Capacities for air according to ASME Section VIII (UV), based on set pressure plus 1% overpressure at 16 C (6 F). Capacities at 2,7 bar (3 psig) and below are based on 7 bar (3 psig) overpressure. US Units ASME Section VIII [S.C.F.M] Actual Orifice diameter d [inch],91 1,46 1,81 Actual Orifice area A [inch 2 ],644 1,667 2,576 LEO S/G * ) [inch 2 ] 62 1,195 1,847 Set pressure [psig] Capacities [S.C.F.M.] 15 27 698 179 2 311 85 1244 3 394 119 1574 4 484 1254 1938 5 575 1489 231 6 666 1724 2664 7 757 1959 328 8 848 2194 3391 9 939 243 3754 1 129 2665 4118 12 1211 3135 4845 14 1393 365 5571 16 1574 476 6298 18 1756 4546 725 2 1938 516 7751 22 212 5486 8478 24 231 5957 925 26 2483 6427 9932 28 2665 6897 1658 3 2846 7368 11385 32 328 7838 12112 34 321 838 12839 36 3391 8778 13565 38 3573 9249 14292 4 3755 9719 1519 42 3936 1189 15745 44 4118 166 16472 46 43 1113 17199 48 4481 116 17926 5 4663 127 18652 55 5117 13246 2469 58 539 13952 21559 * ) LEO S/G = LESER Effective Orifice steam/gas please refer to page /11 How to use capacity-sheets refer to page /9 LWN 488.1-E 6/19
Capacities Water Capacities for water according to AD 2-Merkblatt A2, based on set pressure plus 1 % overpressure at 2 C (68 F). Capacities at 1 bar (14,5 psig) and below are based on,1 bar (1,45 psig) overpressure. Metric Units AD 2-Merkblatt A2 [1 3 kg/h] Actual Orifice diameter d [mm] 23 37 46 Set pressure [bar] LEO L * ) [inch 2 ],516 1,336 2,62 Capacities [1 3 kg/h],1 4,25 11, 17, 5,21 13,5 2,5 7,37 19,1 29,5 1 9,97 25,8 39,9 2 14,1 36,5 56,4 3 17,3 44,7 69,1 4 19,9 51,6 79,8 5 22,3 57,7 89,2 6 24,4 63,2 97,7 7 26,4 68,3 16 8 28,2 73, 113 9 29,9 77,4 12 1 31,5 81,6 126 12 34,6 89,4 138 14 37,3 96,6 149 16 39,3 13 16 18 42,3 11 169 2 44,6 115 178 22 46,8 121 187 24 48,9 126 195 26 5,9 132 23 28 52,8 137 211 3 54,6 141 219 32 56,4 146 226 34 58,2 151 233 36 59,8 155 239 38 61,5 159 246 4 63,1 163 252 Capacities for water according to ASME Section VIII (UV), based on set pressure plus 1 % overpressure at 21 C (7 F). Capacities at 2,7 bar (3 psig) and below are based on 7 bar (3 psig) overpressure. US Units ASME Section VIII [US-G.P.M] Actual Orifice diameter d [inch],91 1,46 1,81 Actual Orifice area A [inch 2 ],644 1,667 2,576 Set pressure [psig] LEO L * ) [inch 2 ],516 1,336 2,62 Capacities [US-G.P.M.] 15 54, 14 216 2 61,1 158 244 3 73,1 189 293 4 84,5 219 338 5 94,4 244 378 6 13 268 414 7 112 289 447 8 119 39 478 9 127 328 57 1 134 346 534 12 146 379 585 14 158 49 632 16 169 437 676 18 179 464 717 2 189 489 755 22 198 513 792 24 27 535 827 26 215 557 861 28 223 578 894 3 231 599 925 32 239 618 955 34 246 637 985 36 253 656 113 38 26 674 141 4 267 691 168 42 274 78 195 44 28 725 112 46 286 741 1146 48 293 757 117 5 299 773 1194 55 313 811 1253 58 322 832 1286 * ) LEO L = LESER Effective Orifice liquids please refer to page /12 How to use capacity-sheets refer to page /9 6/2 LWN 488.1-E
Determination of coefficent of discharge in case of lift restriction or back pressure Diagram for evaluation of ratio of lift / flow diameter (h/d ) in reference to the coefficient of discharge (K dr /α w ),7,6 K dr = α w = f (h/d ) "S/G" h = Lift [mm] d = Flow diameter [mm] of selected safety valve, refer to table article numbers h/d = Ratio of lift / flow diameter p a = Back pressure [bar a] p = Set pressure [bar a] p a / p = Ratio of back pressure / set pressure K dr = Coefficient of discharge acc. to DIN EN ISO 4126-1 α w = Coefficient of discharge acc. to AD 2-Merkblatt A2 K b = Back pressure correction factor acc. to API 52 topic 3.3,5 Coefficient of discharge K dr / αw,1,1 "L" Ratio of lift / flow diameter h / d Diagram for evaluation of coefficient of discharge (K dr /α w ) or K b in reference to the ratio of back pressure / set pressure (p a /p ) K dr = α w = f (p a /p ) and K b = f (p a /p ),7 1,,6,9,5,7 Coefficient of discharge K dr / αw,1,5,6,7,91,6,5,1 Back pressure correction factor K b Ratio of back pressure / set pressure p a / p How to use please refer to page /8 LWN 488.1-E 6/21