Type. Capacities. Safety Relief Valves spring loaded. The-Safety-Valve.com
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1 Type 437 Safety Relief Valves spring loaded The-Safety-Valve.com
2 Approvals Europe PED/DIN EN ISO Germany PED/AD 2000-Merkblatt A2 United States ASME Sec. VIII Div. 1 Canada CRN China AQSIQ Eurasian Custom Union EAC Classification societies Actual Orifice diameter d 0 [mm] 6 10 Actual Orifice area A 0 [mm 2 ] Actual Orifice diameter d 0 [inch] Actual Orifice area A 0 [inch 2 ] Coefficient of discharge K dr Z0008/0/21 Coefficient of discharge w TÜV SV 980 Coefficient of discharge K Zulassungs-Nr. M D/G Zulassungs-Nr. M F Coefficient of discharge K The current approval no. can be found at S/G L Coefficient of discharge w The current approval no. can be found at Coefficient of discharge w The current approval no. can be found at Homepage Bureau Veritas BV DNV GL Lloyd s Register EMEA LREMEA Registro Italiano Navale RINA U.S. Coast Guard U.S.C.G The valid certification number is changed with every reneval. A sample certificate including the valid certification number can be found at Rated slope Within the capacity certification according to ASME Sec. VIII Div. 1 the coefficients of discharge for Series 437 are issued as rated slope values instead of K values. Rated slope values can be converted into K values. The table above shows the converted K values. The original rated slope values are listed in the table below. Fluid Rated slope S 2.86 lb / hr / PSIA G 1.02 SCFM / PSIA L 1.54 GPM PSID 16
3 Steam Metric Units US Units for saturated steam according to AD 2000-Merkblatt A2, based on set pressure plus 10 % overpressure. at 1 bar (14.5 psig) and below are based on 0.1 bar (1.45 psig) overpressure for saturated steam according to ASME Section VIII (UV), based on set pressure plus 10% overpressure. at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure. AD 2000-Merkblatt A2 [ kg/h] ASME Section VIII [lb/h] Act. Orifice dia. d 0 [mm] 6 10 Act. Orifice area A 0 [mm 2 ] LEOS/G* ) [inch 2 ] Set pressure [bar] [kg/h] No satureted steam application in set pressure range Act. Orifice dia. d 0 [inch] Act. Orifice area A 0 [inch 2 ] LEOS/G* ) [inch 2 ] Set pressure [psig] [lb/h] No satureted steam application in set pressure range 93
4 Air Metric Units US Units for air according to AD 2000-Merkblatt A2, based on set pressure plus 10 % overpressure at 0 C and 1013 mbar. at 1 bar (14.5 psig) and below are based on 0.1 bar (1.45 psig) overpressure. AD 2000-Merkblatt A2 [m n 3 /h] for air according to ASME Section VIII (UV), based on set pressure plus 10% overpressure at 60 F (16 C). at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure. ASME Section VIII [S.C.F.M.] Act. Orifice dia. d 0 [mm] 6 10 Act. Orifice area A 0 [mm 2 ] LEO S/G * ) [inch 2 ] Set pressure [bar] [m n 3 /h] Act. Orifice dia. d 0 [mm] Act. Orifice area A 0 [mm 2 ] LEO S/G * ) [inch 2 ] Set pressure [psig] [S.C.F.M.]
5 Water Metric Units US Units for water according to AD 2000-Merkblatt A2, based on set pressure plus 10 % overpressure at 20 C (68 F). at 1 bar (14.5 psig) and below are based on 0.1 bar (1.45 psig) overpressure. for water according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure at 70 F (21 C). at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure. AD 2000-Merkblatt A2 [10 3 kg/h] ASME Section VIII [US-G.P.M.] Act. Orifice dia. d 0 [mm] 6 10 Act. Orifice area A 0 [mm 2 ] LEOL* ) [inch 2 ] Set pressure [bar] [10 3 kg/h] No TÜV approval, useable for thermal expansion Act. Orifice dia. d 0 [inch] Act. Orifice area A 0 [inch 2 ] LEOL* ) [inch 2 ] Set pressure [psig] [US-G.P.M.] No TÜV approval, useable for thermal expansion 95
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 0 ) in reference to the coefficient of discharge (K dr / w ) Kdr = w = f (h/d 0 ) h = Lift [mm] d 0 = Flow diameter [mm] of selected safety valve, refer to table article numbers h/d 0 = Ratio of lift / flow diameter p a0 = Back pressure [bar a ] p 0 = Set pressure [bar a ] p a0/ p 0 = Ratio of back pressure / set pressure K dr = Coefficient of discharge acc. to DIN EN ISO w = Coefficient of discharge acc. to AD 2000-Merkblatt A2 K b = Back pressure correction factor acc. to API 520 topic 5.3 A lift restriction ist not applicable because the actual design and the certified lift are 1.5 mm / 1 /16 inch. Diagram for evaluation of ratio of the coefficient of discharge (K dr / w ) in reference to the ratio of back pressure / set pressure (p a0 /p 0 ) 0.8 K dr = α w = f (p a0 /p 0 ) and K b = f (p a0 /p 0 ) d 0 6 "S/G" Coefficient of discharge K dr / αw d 0 10 "S/G" Ratio of back pressure / set pressure p a0 / p Back pressure correction factor K b 96
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