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GeneralSour gas service (H 2 S)Normative basisIn accordance with NACE standard MR 0175-2003 sour gas service means the presence of H 2 S in the following conditions:Part 1.4.1.1.:All gas, gas condensate, and sour crude oil – When the partial pressure of H 2 S in a wet (water as a liquid)gas phase of a gas, gas condensate, or crude oil system is equal to or exceeds 0,003 bar g (0,05 psia)Exceptions are:Part 1.4.2.1.: Low-pressure gas: When the total pressure is lower than 4,5 bar a (65psia)Part 1.4.2.2.: Low-pressure oil and gas multiphase systems: …Other Sour gas standards:NACE MR 0103-2003: Materials resistance to sulfide stress cracking in corrosive petroleum refining environments.DIN EN ISO 15156-1: Petroleum and natural gas industries – Materials for use in H 2 S-containing environments in oiland gas production – Part 1: General principles for selection of cracking-resistant materials(ISO 15156-1:2001)MiscellaneousWorkstandards: Please refer to LWN 001.91General requirements for sour gas serviceThe above mentioned standards require a maximum hardness of 22 HRC for the most steels.For the actual requirements of a specific material please refer to the applied standard.LESER sour gas levelGeneral: Sour gas material requirements must be fulfilled if pressure and partial pressure conditions according tothe applied standard exist.Based on these general statement LESER defines two sour gas level for safety valves:Part definitionLevel 1 Level 2Contact with the medium inclosed positionContact with the medium inopened positionConventional Balanced bellows Conventional Balanced bellowsContact areaPressure requirements Set pressure ≥ 4,5 bar a (65psia) Back pressure ≥ 4,5 bar a (65psia)Safety valve operation closed closed / openedParts concernedNecessary material modificationType526252635267BodymaterialWCB 1.0619LCBWC6 1.7357ConventionaldesignBalancedbellows designNozzleDiscNozzleDiscAllNozzleDiscBonnet spacerBellowsDesign Part Material Option code Material Option codeConventionalBalancedbellowsDiscDisc1.4404 / 316Lstellited1.4404 / 316LstellitedJ25J25Please choose balancedbellows design1.4404 / 316LJ25stellitedBellows 1.4571 / 316Ti J78 1.4571 / 316Ti J785264 CF8M 1.4408Conventional No modification required No modification requiredBalancedbellowsBellows 1.4571 / 316Ti J78 1.4571 / 316Ti J7800/11 LWN 480.01-E
TypeType 526Type 526Packed lever H4Closed bonnetConventional design526Flanged Safety Relief Valves– spring loadedContentsChapter/PageMaterials• Conventional design 01/02• Balanced bellows design 01/04How to order• Numbering system 01/06• Article numbers 01/08Dimensions• Metric Units 01/10• US Units 01/12Weights• Metric Units 01/14• US Units 01/15Orifice [ D – T]• Selection charts /Article numbers, dimensions and weights 01/16• Pressure temperature ratings[Metric Units + US Units] 01/18Flange drillings 01/72Flange facings 01/73Outlet with flange rating class 300 01/74Spare parts 01/76Available options 01/84Approvals 01/85Capacities• Steam [Metric Units + US Units] 01/86• Air [Metric Units + US Units] 01/88• Water [Metric Units + US Units] 01/90LWN 480.01-E01/01
Page 1 and 2: APIFlanged Safety Relief ValvesSeri
Page 3 and 4: ContentsChapter/PageGeneral 00/01Ap
Page 5 and 6: General InformationGeneralApplicati
Page 7 and 8: Valve finderHow to find the right A
Page 9 and 10: How to useSelection chartsGeneralTh
Page 11 and 12: How to useGeneral8Base of calculati
Page 13: LEOLGeneralThis table is based on t
Page 17 and 18: Type 526Conventional designItemMate
Page 19 and 20: Type 526Balanced bellows designMate
Page 21 and 22: Type 5264 5 6Options Documentation
Page 23 and 24: Type 526Article numbers - OverviewA
Page 25 and 26: d 0 = Actual orifice diameterA 0 =
Page 27 and 28: d 0 = Actual orifice diameterA 0 =
Page 29 and 30: Type 526WeightsUS UnitsBonnetallLif
Page 31 and 32: Type 526Orifice DArticle numbers, d
Page 33 and 34: Type 526Orifice DPressure temperatu
Page 35 and 36: Type 526Orifice EArticle numbers, d
Page 37 and 38: Type 526Orifice EPressure temperatu
Page 39 and 40: Type 526Orifice FArticle numbers, d
Page 41 and 42: Type 526Orifice FPressure temperatu
Page 43 and 44: Type 526Orifice GArticle numbers, d
Page 45 and 46: Type 526Orifice GPressure temperatu
Page 47 and 48: Type 526Orifice HArticle numbers, d
Page 49 and 50: Type 526Orifice HPressure temperatu
Page 51 and 52: Type 526Orifice JArticle numbers, d
Page 53 and 54: Type 526Orifice JPressure temperatu
Page 55 and 56: Type 526Orifice KArticle numbers, d
Page 57 and 58: Type 526Orifice KPressure temperatu
Page 59 and 60: Type 526Orifice LArticle numbers, d
Page 61 and 62: Type 526Orifice LPressure temperatu
Page 63 and 64: Type 526Orifice MArticle numbers, d
Page 65 and 66:
Type 526Orifice MPressure temperatu
Page 67 and 68:
Type 526Orifice NArticle numbers, d
Page 69 and 70:
Type 526Orifice NPressure temperatu
Page 71 and 72:
Type 526Orifice PArticle numbers, d
Page 73 and 74:
Type 526Orifice PPressure temperatu
Page 75 and 76:
Type 526Orifice QArticle numbers, d
Page 77 and 78:
Type 526Orifice QPressure temperatu
Page 79 and 80:
Type 526Orifice RArticle numbers, d
Page 81 and 82:
Type 526Orifice RPressure temperatu
Page 83 and 84:
Type 526Orifice TArticle numbers, d
Page 85 and 86:
Type 526Orifice TPressure temperatu
Page 87 and 88:
Type 526Flange facingsIndication St
Page 89 and 90:
Orifice900 x 300 1500 x 300 2500 x
Page 91 and 92:
Type 526Spare parts - Disc (Item 7)
Page 93 and 94:
Type 526Spare parts - Stainless ste
Page 95 and 96:
Type 526Spare parts - Gasket Body /
Page 97 and 98:
Type 526Spare parts recommendations
Page 99 and 100:
Type 526ApprovalsApprovalsOrifice D
Page 101 and 102:
Type 526Capacities - SteamCapacitie
Page 103 and 104:
Type 526Capacities - AirCapacities
Page 105 and 106:
Type 526Capacities - WaterCapacitie
Page 107 and 108:
Accessoriesand OptionsContentsChapt
Page 109 and 110:
Accessories and OptionsCaps and lev
Page 111 and 112:
Accessories and OptionsCaps and lev
Page 113 and 114:
Accessories and OptionsMetal seat -
Page 115 and 116:
Accessories and OptionsSoft seal di
Page 117 and 118:
Accessories and OptionsSoft sealSof
Page 119 and 120:
Accessories and OptionsBalanced bel
Page 121 and 122:
Accessories and OptionsLift indicat
Page 123 and 124:
Accessories and OptionsHeating jack
Page 125 and 126:
Accessories and OptionsO-ring dampe
Page 127 and 128:
Fax OrderPlease send your request t
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