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GeneralHow to useGeneral signs and symbols*✓–This option is covered by standard designAvailableNot possibleSigns and symbols for flange drillings and flange facings*Standard design, no option code required( * ) Flange dimensions except flange thickness are in accordance with flange standard (e.g. ASME B16.5)Flange thickness is smaller (max. 2 mm), see “Multiple pressure rating”–Flange drilling/facing is not possibleOption code for flange drilling and dimension, e.g. H50H50(H50)[H50]Flange drilling as specified in flange standardOuter flange diameter, flange thickness and height of flange facing may be larger, see “Dimensions”Flange dimensions except flange thickness are in accordance with standardFlange thickness is smaller (max. 2 mm), see “Multiple pressure rating”Flange drilling as specified in standard/flange thickness may be smallerOuter flange diameter is smaller than required, but complete back side facing for nut is assuredOption code for flange facing, e.g. L38L38Flange facing as specified in flange standardGeneral information concerning flange drillings and flange facingsFlange dimensions of LESER Type 526 exceed flange dimension as mentioned in ASME / ANSI B16.5 andDIN EN 1092. This exceedance is in accordance with API Standard 526, Section 2.4.DimensionsMultiplepressure ratingSmooth finishStock finishDimensions: “For some valve designs, the inlet raised face height may substantially exceed the nominal dimensionspecified in ASME / ANSI B16.5 (and DIN EN 1092). Consult the manufacturer for exact dimension.”The reason for this exceedance is:- height of nozzle placed in the inlet of valve- due to the outer diameter of the nozzle thread flange thickness has to be thicker than normalASME / ANSI B16.5 and DIN EN 1092 dimension to achieve the required pressure ratingThe flange standard shows the same drilling, facing and outer diameter for several pressure ratings, e.g. PN 16 up to PN 40Due to the pressure rating of the casting LESER fulfills the requirements for flange thickness e.g. of PN 16 but not PN 40The effective MSS SP-6 (Edition 2001) does not mention “smooth finish” anymore.In MSS SP-6 (Edition 1980) “smooth finish” is defined for finishes of contact flanges as “250 µinch (6,3 µm) AARH max.”.LESER supplies flange facings according to ASME B16.5 – 1996, paragraph 6.4.4.3:“Either a serrated concentric or serrated spiral finish resulting in service finish from 125 µinch to 250 µinch averageroughness shall be furnished.” This finish meets the requirements of MSS SP-6 (Edition 1980), which is not valid anymore!Stock finish is not defined in any technical standard. If purchase orders show “stock finish” LESER supplies standardfacing according to DIN or ASME (marked with * in table “Flange facings” of each valve series).MaterialsPlease find below a summary of material codes at LESER. Please note that- for every body material an inspection certificate 3.1 according to EN 10204 is available- many materials have a multiple inspection certificate 3.1.Material codeFlanged safety valve bodyBody material is certified with 3.1 (EN 10204) for the following materialsENASME2 Carbon steel 1.0619 WCB, WCC3 Low temperature carbon steel 1.0619 LCB, LCC, WCB, WCC4 Stainless steel 1.4408 CF8M (Charpy test at -196°C)7 High temperature carbon steel 1.7357 WC600/05 LWN 480.01-E
How to useSelection chartsGeneralThe pages 01/16 – 01/71 contain selection charts and specification tables.They specify important data about the valves based on the API 526 fifth edition 2002 like• Valve size• Body materials• Flange rating classes• Set pressure and temperature limits• Back pressure limitsProcedureStep Procedure Reference12Determination of the required flow areaand orifice letter (sizing)Determination of:• Material• Flange rating class• Article No.• API RP 520• VALVESTAR – Sizing software• Capacity tables (page 01/86 – 01/91)Selection charts (page 01/16 – 01/68) orSpecification tables (page 01/17 – 01/71)3 Determination of the material Specification tables (page 01/17 – 01/71)4 Determination of the code for lifting device Specification tables (page 01/17 – 01/71)Type 526 Orifice D 35Selection chart4150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300WCB 5262.001X–5262.002X 5262.003X–5262.004X 5262.005XWC6 – – 5267.006X 5267.007X –5267.008X 5267.009X610001p [bar]241,40 2550 75 100 150 200 250 300 350 4005WCB WC690040080070030060022 500217480 2004006300100200T [°F]T [°C]100035000 5001000 1500 2000 3000 4000 5000 6000p [psig]10ExplanationNo. Description Example123456Set pressure p 241,4 bar 3500 psigTemperature T 217 °C 480 °FRequired orifice letterDFlange rating class 2500 x 300Material WCB 1.0619Article No. (X = Code for lifting device) 5262.005XLWN 480.01-E00/06
Page 1 and 2: APIFlanged Safety Relief ValvesSeri
Page 3 and 4: ContentsChapter/PageGeneral 00/01Ap
Page 5 and 6: General InformationGeneralApplicati
Page 7: Valve finderHow to find the right A
Page 11 and 12: How to useGeneral8Base of calculati
Page 13 and 14: LEOLGeneralThis table is based on t
Page 15 and 16: TypeType 526Type 526Packed lever H4
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
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Type 526Orifice MPressure temperatu
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Type 526Orifice NArticle numbers, d
Page 69 and 70:
Type 526Orifice NPressure temperatu
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Type 526Orifice PArticle numbers, d
Page 73 and 74:
Type 526Orifice PPressure temperatu
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Type 526Orifice QArticle numbers, d
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Type 526Orifice QPressure temperatu
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Type 526Orifice RArticle numbers, d
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Type 526Orifice RPressure temperatu
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Type 526Orifice TArticle numbers, d
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Type 526Orifice TPressure temperatu
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Type 526Flange facingsIndication St
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Orifice900 x 300 1500 x 300 2500 x
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Type 526Spare parts - Disc (Item 7)
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Type 526Spare parts - Stainless ste
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Type 526Spare parts - Gasket Body /
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Type 526Spare parts recommendations
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Type 526ApprovalsApprovalsOrifice D
Page 101 and 102:
Type 526Capacities - SteamCapacitie
Page 103 and 104:
Type 526Capacities - AirCapacities
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Type 526Capacities - WaterCapacitie
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Accessoriesand OptionsContentsChapt
Page 109 and 110:
Accessories and OptionsCaps and lev
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Accessories and OptionsCaps and lev
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Accessories and OptionsMetal seat -
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Accessories and OptionsSoft seal di
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Accessories and OptionsSoft sealSof
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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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