Folder API Series 526 NEW 7/13/04 4:37 PM Page 1 …

1 C ATA L O GThe Safety Va l v eAPI Seri e sAPI Seri e sSeries 526 Folder API Series 526 NEW 7/13/04 4:37 PM Page 1 Type 526 Type 526 Plain lever H3 Type 526 Open bonnetType 526 Balanced bellowsdesignFolder API Series 526 NEW 7/13/04 4:37 PM Page 2 LWN Safety Relief Valves API Series Contents3 ContentsAccessories and OptionsCaps and Levers42 Balanced Bellows44 Metal Seat45 Soft Seal46 Heating Jacket48 Lift Indicator49 DIN Flanges50 Spare Parts52 Approvals59 Capacity Tables Capacities US UnitsSTEAM60 Capacities Metric UnitsSTEAM61 Capacities US UnitsAIR62 Capacities Metric UnitsAIR63 Capacities US UnitsWATER64 Capacities Metric UnitsWATER65 Specification Sheet66 Applications5 Features and Benefits5 Codes and Standards5 Materials Conventional Design6 Balanced Bellows

2 Design8 Sour Gas Service9 How to order Numbering system10 Valve Codes Overview12 Specifications 13 Orifice D14 Orifice E16 Orifice F18 Orifice G20 Orifice H22 Orifice J24 Orifice K26 Orifice L28 Orifice M30 Orifice N32 Orifice P34 Orifice Q36 Orifice R38 Orifice T40 Type 526 Cap H2 Type 526 Packed lever H4 Folder API Series 526 NEW 7/13/04 4:37 PM Page 3 LWN Safety Relief Valves API Series Type 5264 LESER s API Series 526is aspring loaded pressure relief valveseries, specially designed and manu-factured to API 526 and approvedaccording to ASME (Sec.)

3 VIII, Div. 1)the Canadian CRN, the European PEDstandard, the German AD 2000-Merk-blatt A2 and those of many othercountries, covering requirements fromend-users, OEM s and engineeringcompanies worldwide, thus allowingimmediate s API Series 526hasbeen optimized in close cooperationwith plant engineers and service spe-cialists, simplifying design with fewercomponents for less down time, fewerspare parts and lower testing at the LESERASME-certified test lab together withup to date manufacturing processesensure the reliability of this state ofthe art API Series 526 NEW 7/13/04 4.

4 37 PM Page 4 LWN Safety Relief Valves API Series Applications Features and Benefits Codes and Standards5 ApplicationsLESER s API Series 526 presents thesimple safe solution for heavy dutyapplications, such as crude oil extrac-tion, transportation and processing in Refineries Chemical industry Petrochemical industry Oil and Gas - Onshore and Offshore Oilfields ( Christmas trees ) Vessels & piping systems Blow-down systems Storage tank farmsFeatures and BenefitsLESER s API Series 526covers a largevariety of types, materials and optionsto fit any application:Scope of Design Seven valve sizes from 1 through 8 14 orifice sizes from D through T Materials.

5 WCB, WC6, CF8M and awide range of material variations forcritical applications Open or closed bonnet, packed orplain lifting lever or gastight cap Optional balanced bellows con-struction for back pressure compen-sation Heating jacket available for high vis-cosity fluids Many other options to adjust to var-ious operating conditionsSimplified design for built-in safety Fool-proof design with few parts forbuilt-in safety Single trim for steam, gas and liquidfor fewer spare parts and easiermaintenance One-piece spindle reduces friction Two-point-guided nozzle for im-proved alignment Self draining body avoids residuesand reduces corrosion Long springs for large pre s s u re rangesEase of plant design, installation.

6 Operation and maintenance Reduced number of components foreasier and more cost effective main-tenance Replaceable nozzle and disc Stellited or hardened metal sealingfor longer product life Optional soft seat for superior tight-ness Integral cast support bracketsCodes and StandardsLESER s API Series 526complies withthe following codes and standards: ASME Section VIII National Boardcertified capacities (single trim forsteam, gas and liquid service): UV-stamp ASME Section II - materials ASME and ASME API 526 fourth edition 1995 API 520 and 527 NACE MR 0175 ISO 4126 PED 97/23/EC (CE-marking) CRN, VdTUEV-SV 100,AD 2000-Merkblatt A2 OthersFolder API Series 526 NEW 7/13/04 4:37 PM Page 5 LWN Safety Relief Valves API Series Materials Conventional DesignType 5266 Materials Conventional DesignItemPart NameTrim.

7 StandardStandard Service Type 52621 BodySA 216 WCB5 Nozzle316L6 Adjusting ring316L7 DiscHardenedstainless steel8 Guide316L9 BonnetSA 216 WCB12 SpindleAISI 42014 Split ringAISI 42016/17 Spring plate12L1318 Adjusting screw with bushingAISI 430 FPTFE19 Lock nutSteel22 Lift stop316L54 SpringHigh temperaturealloy steel40 Cap H212L1355 StudB756 Nut2H60 GasketGraphite / 316L61 BallHardenedstainless steel69 Needle bearing316L73 Lock screw316 LRemarkNozzles for flange classes 600 and higher are sup-plied with stellited sealing surfaces as a stan-dardfor improved wear API Series 526 NEW 7/13/04 4:37 PM Page 6 LWN Safety Relief Valves API Series Material Options Conventional DesignMaterial Options Conventional DesignCorrosive Service1 Type 5264 Trim: Duplex Grade DATrim:Monel Grade MATrim:Hastelloy Grade HATrim.

8 StandardPart NameItemSA 351 CF8 MSA 351 CF8 MSA 351 CF8 MSA 351 CF8 MBody1 Duplex Monel Hastelloy C316 LNozzle5 Duplex Monel Hastelloy C316L stellitedDisc7316L316L316L316 LAdjusting ring6316L316L316L316 LGuide8SA 351 CF8M orSA 351 CF8M orSA 351 CF8M orSA 351 CF8M orBonnet9 Spindle12SA 479 316 TiSA 479 316 TiSA 479 316 TiSA 479 316 TiAISI 420 AISI 420 AISI 420 AISI 420 Spring plate16 / 17316L316L316L316 LSplit ring14316L316L316L316 LAdjusting screw with bushing18316L teniferPTFE316L teniferPTFE316L teniferPTFE316L teniferPTFECap H24054316L316L316L316 LLift stop22316L316L316L316 LLock nut19316L316L316L316 LSpringStainless steelStainless steelStainless steelStainless steel55 StudB8MB8MB8MB8M56 Nut8M8M8M8M60 GasketGraphite / 316 LGraphite / 316 LGraphite / 316 LGraphite / 316 L61 Ball31631631631669 Needle bearing316L316L316L316L73 Lock screw316L316L316L316 LNotes:1 Materials in blue: variations from standard bill of material2316L stellited for flange classes 900 and higherFolder API Series 526 NEW 7/13/04 4.

9 37 PM Page 7 Flanged Safety Relief Valves API Series Materials Balanced Bellows DesignType 5268 LWN Balanced Bellows DesignItemPart NameTrim: standardStandardServiceType 5262 Trim: standardHigh Te m p e r a t u reService Type 52671 BodySA 216 WCBSA 217 WC65 Nozzle316L316L stellited6 Adjusting ring316L316L7 DiscHardened stainless steelHardened stainless steel8 Guide316L316L9 BonnetSA 216 WCBSA 217 WC611 Bonnet spacer1SA 479 316 LSA 479 316L14 Split ring316L316L12 SpindleAISI 420 AISI 42015 Bellows316L316L16/17 Spring plate12L1312L1318 Adjusting screw with bushingAISI 430 FPTFEAISI 430 FPTFE54 SpringHigh temperaturealloy steelHigh temperaturealloy steel40 Cap H212L1312L1319 Lock nutSteelSteel22 Lift stop316L316L55 StudB8MB1656

10 Nut8M7M60 GasketGraphite / 316 LGraphite / 316L61 BallHardened stainless steelHardened stainless steel69 Needle bearing316L316L73 Lock screw8M8 MNote:1 Orifice T without bonnet spacerRemarkNozzles for flange classes 600 and higher are sup-plied with stellited sealing surfaces as a stan-dardfor improved wear API Series 526 NEW 7/13/04 4:37 PM Page 8 LWN Safety Relief Valves API Series Material Options Balanced Bellows Design Sour Gas Service (H2S)918 Material Options Balanced Bellows DesignCorrosive Service1 Type 5264 Trim: Duplex Grade DBTrim: Monel Grade MBTrim: Hastelloy Grade HBTrim.