Type. Capacities. 441, 442 Full nozzle DIN. Flanged Safety Relief Valves spring loaded. The-Safety-Valve.com LWN E
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1 Type 441, 442 Full nozzle DIN Flanged Safety Relief Valves spring loaded Capacities The-Safety-Valve.com LWN E
2 Approvals Approvals DN O Actual Orifice diameter d [mm] Europe Coefficient of discharge K dr DIN EN ISO Approval No Z8//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 E 6/17
3 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] LEO S/G * ) [inch 2 ] 62 1,195 1,847 Set pressure [bar] Capacities [kg/h], , 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] * ) 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 E
4 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] LEO S/G * ) [inch 2 ] 62 1,195 1,847 Set pressure [bar] Capacities [m n3 /h], , 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.] * ) LEO S/G = LESER Effective Orifice steam/gas please refer to page /11 How to use capacity-sheets refer to page /9 LWN E 6/19
5 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] 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, ,2 73, ,9 77, ,5 81, ,6 89, ,3 96, , , , , , , , , , , , , , 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, , , , , * ) LEO L = LESER Effective Orifice liquids please refer to page /12 How to use capacity-sheets refer to page /9 6/2 LWN E
6 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 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 E 6/21
Type 441 DIN 442 DIN. Capacities. Flanged Safety Relief Valves spring loaded. The-Safety-Valve.com LWN E
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