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Type 462 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 /α w ) 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 4126-1 α w = Coefficient of discharge acc. to AD 2000-Merkblatt A2 K b = Back pressure correction factor acc. to API 520 topic 3.3 d 0 Ø 9 mm d 0 Ø 13 mm d 0 Ø 17,5 mm 0,85 K dr = α w = f (h/d 0 ) – S/G 0,85 K dr = α w = f (h/d 0 ) – S/G 0,80 K dr = α w = f (h/d 0 ) – S/G Coefficient of discharge K dr / αw Ratio of lift / flow diameter h / d 0 0,80 0,75 0,70 Ratio of lift / flow diameter h / d 0 0,24 0,19 Ratio of lift / flow diameter h / d 0 0,75 0,65 0,60 0,70 0,55 0,65 0,50 0,45 0,60 0,40 0,35 0,55 0,30 0,50 0,25 0,45 0,15 0,20 0,10 0,15 0,20 0,25 0,05 0,1 0,15 0,2 0,05 0,1 0,15 0,65 K dr = α w = f (h/d 0 ) – L Coefficient of discharge K dr / αw d 0 Ø 9 mm d 0 Ø 13 mm d 0 Ø 17,5 mm 0,60 K dr = α w = f (h/d 0 ) – L Coefficient of discharge K dr / αw 0,50 K dr = α w = f (h/d 0 ) – L 0,2 0,22 0,25 0,60 0,55 0,45 Coefficient of discharge K dr / αw Ratio of lift / flow diameter h / d 0 Ratio of lift / flow diameter h / d 0 0,24 0,19 Ratio of lift / flow diameter h / d 0 0,55 0,40 0,55 0,45 0,35 0,50 0,40 0,30 0,45 0,35 0,25 0,30 0,40 0,25 0,20 0,35 0,20 0,15 0,30 0,15 0,10 0,10 0,15 0,20 0,25 0,05 0,1 0,15 0,2 0,05 0,1 0,15 Diagram for evaluation of ratio of the coefficient of discharge (K dr /α w ) in reference to the ratio of back pressure / set pressure (p a0 /p 0 ) Coefficient of discharge K dr / αw Coefficient of discharge K dr / αw 0,2 0,22 0,25 Type 462 Coefficient of discharge K dr / αw 0,9 d 0 Ø 9 mm d 0 Ø 13 mm d 0 Ø 17,5 mm K dr = α w = f (p a0 /p 0 ) and K b = f (p a0 /p 0 ) K dr = α w = f (p a0 /p 0 ) and K b = f (p a0 /p 0 ) K dr = α w = f (p a0 /p 0 ) and K b = f (p a0 /p 0 ) 0,8 0,8 0,8 1,00 1,00 Ratio of back pressure / set pressure p a0 / p 0 0,66 Ratio of back pressure / set pressure p a0 / p 0 Ratio of back pressure / set pressure p a0 / p 0 0,90 0,90 0,7 0,7 0,7 0,80 0,80 0,6 0,6 0,6 0,70 0,70 0,5 0,60 0,5 0,60 0,5 0,4 0,50 0,4 0,50 0,4 0,3 0,40 0,3 0,40 0,3 0,30 0,30 0,2 0,2 0,2 0,20 0,20 0,1 0,10 0,1 0,10 0,1 0,0 0,00 0,0 0,00 0,0 0,2 0,3 0,4 0,5 0,6 0,7 0,3 0,4 0,5 0,6 0,7 0,8 0,2 0,3 0,4 0,5 0,6 0,7 0,83 Back pressure correction factor K b Coefficient of discharge K dr / αw 0,9 1,10 Back pressure correction factor K b Coefficient of discharge K dr / αw 0,9 0,8 0,833 1,00 0,80 0,60 0,40 0,20 0,00 Back pressure correction factor K b How to use please refer to page 00/08 07/20 LWN 481.01-E
Type 462 HDD Safety Relief Valves Heavy Duty Design – spring loaded Contents Chapter/Page Type 462 HDD Cap H2 Materials • Available designs 08/02 • Available designs – materials 08/03 How to order • Numbering system 08/04 • Article numbers 08/06 Dimensions and weights • Metric Units [Threaded connection] 08/08 [Flanged connection] 08/09 • US Units [Threaded connection] 08/10 [Flanged connection] 08/11 Pressure temperature ratings • Metric Units + US Units 08/12 Order information – Spare parts 08/13 Available options 08/14 Approvals 08/15 Capacities • Metric Units [Steam, Air, Water] 08/16 • US Units [Steam, Air, Water] 08/17 Determination of coefficent 08/18 of discharge K dr /α w Type 462 HDD LWN 481.01-E 08/01
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Compact Performance Safety Relief V
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General Type 437 Orifice diameter d
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Contents Type 459 05/01 Materials
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General Information General Applica
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Valve finder General How to find th
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Valve selection General Valve size
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How to use General Sample Determina
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How to use General 7 Base of capaci
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Sour gas service (H 2 S) General No
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Type Type 437 Type 437 Packed knob
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Type 437 Available designs - materi
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Type 437 Type 437 4 5 6 Options Doc
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Type 437 How to order - Article num
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Type 437 Dimensions and weights - M
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Type 437 Dimensions and weights - U
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Type 437 Order information - Spare
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Type 437 Approvals Type 437 Approva
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Type 437 Capacities - Air Capacitie
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Type 437 Determination of coefficen
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Type Type 438 Packed knob H4 Conven
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Type 438 4 5 6 Options Documentatio
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Type 438 How to order - Article num
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Type 438 Order information - Spare
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Type 438 Approvals Approvals Actual
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Type 438 Determination of coefficen
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Type 439 Packed knob H4 Type 439 Sa
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Type 439 Pressure temperature ratin
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Type 439 Available Options Male thr
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Type 439 Capacities Capacities acco
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Accessories and Options Contents Ch
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Accessories and Options Caps and le
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Accessories and Options Available c
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Accessories and Options Sealing sur
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Accessories and Options Heating jac
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Type Type 459 Plain lever H3 459 Sa
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Page 89 and 90: Type 459 How to order - Article num
Page 91 and 92: Type 459 Dimensions and weights - M
Page 93 and 94: Type 459 Dimensions and weights - U
Page 95 and 96: Type 459 Pressure temperature ratin
Page 97 and 98: Type 459 Order information - Spare
Page 99 and 100: Type 459 Approvals Europe Approvals
Page 101 and 102: Type 459 Capacities - US Units Capa
Page 103 and 104: Type 459 HDD Safety Relief Valves H
Page 105 and 106: Type 459 HDD Available designs - ma
Page 107 and 108: Type 459 HDD 4 5 6 Options Document
Page 109 and 110: Type 459 HDD How to order - Article
Page 111 and 112: Type 459 HDD Dimensions and weights
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Page 117 and 118: Type 459 HDD Approvals Europe Appro
Page 119 and 120: Type 459 HDD Capacities - US Units
Page 121 and 122: Type Type 462 Plain lever H3 462 Sa
Page 123 and 124: Type 462 Available designs - materi
Page 125 and 126: Type 462 4 5 6 Options Documentatio
Page 127 and 128: Type 462 How to order - Article num
Page 129 and 130: Type 462 Dimensions and weights - M
Page 131 and 132: Type 462 Dimensions and weights - U
Page 133 and 134: Type 462 Pressure temperature ratin
Page 135 and 136: Type 462 Order information - Spare
Page 137 and 138: Type 462 Approvals Europe Approvals
Page 139: Type 462 Capacities - US Units Capa
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Page 145 and 146: Type 462 HDD 4 5 6 Options Document
Page 147 and 148: Type 462 HDD How to order - Article
Page 153 and 154: Type 462 HDD Order information - Sp
Page 155 and 156: Type 462 HDD Approvals Europe Appro
Page 157 and 158: Type 462 HDD Capacities - US Units
Page 159 and 160: Accessories and Options Contents Ch
Page 161 and 162: Accessories and Options Overview Op
Page 163 and 164: Accessories and Options Caps and le
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Page 167 and 168: Accessories and Options Sealing sur
Page 169 and 170: Accessories and Options Heating jac
Page 171 and 172: Accessories and Options Balanced be
Page 173 and 174: Accessories and Options O-ring damp
Page 175 and 176: Accessories and Options Lift restri
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