Garlock Metallic GasketCatalog
Garlock Metallic GasketsGarlock Metallic Gaskets, a division of Garlock SealingTechnologies, manufactures spiral wound, metal clad,solid metal and metal core gaskets at its facility in Houston, Texas. This facility is registered to ISO-9001.In recent years, Garlock Metallic Gaskets has introducedsome of the industry’s most innovative production methods and products. For example, the CONTROLLED DENSITY process for spiral wound gaskets ensures a hightightness level at a lower bolt stress. The TANDEM SEAL combines chemical resistance and fire safety in a single gasket. The Garlock EDGE gasket seals at lower bolt stresswhile virtually eliminating the problem of inward buckling.Garlock Metallic Gaskets is also known for excellence inmaterial and product quality as well as its outstandingcustomer service.This catalog is provided for customer information andconvenience. However, Garlock Metallic Gaskets applications engineers and customer service personnel arealso on hand to assist you with your application requirements and technical questions. Please give us a call at1-888-GARLOCK. We are here to serve you.CONTROLLED DENSITY , TANDEM SEAL , STABL-LOCK andG.E.T. are trademarks of Garlock Inc.EDGE , GRAPHONIC , FLEXSEAL and TEPHONIC are registeredtrademarks of Garlock Inc.ContentsMetallic Gasket StylesGasket Selection. D-2Spiral Wound Gaskets. D-3Performance Metrics. D-4The Garlock EDGE Gasket. D-5HEAT SHIELD Gasket. D-6TANDEM SEAL Gasket. D-7FLEXSEAL Family. D-8RW, RWI, SW (For ASME flanges). D-8MC, MCR (For boiler manholes). D-9HH (For boiler handholes). D-10RW-RJ, RWI-RJ (For ring joint flanges).D-11LMF (For large male/female flanges). D-12LTG (For large tongue and groove flanges). D-12STG (For small tongue and groove flanges).D-12Engineering DataFactors Affecting Gasket Performance. D-18Material Temperature Limits. D-19Thickness and Tolerances. D-19Flange Types . D-20Recommended Flange Finish. D-21Maximum Bore . D-22Gasket Dimensions. D-23Gasket Factors M and Y. D-32Torque Tables . D-33Flange and Bolt Dimensions. D-39Gasket Installation. D-40Troubleshooting Leaking Joints. D-41Ordering Guide . D-42Application Data Form. D-43Exchanger and Vessel Gaskets. D-13Heat Exchanger Gasket Configurations. D-13600 Series Metal-Clad Gaskets . D-14GRAPHONIC Metallic Gasket. D-16Garlock Kammprofile Gasket. D-17D-1
Gasket SelectionSprial Wound GasketsOne of the best all-around seals, the spiral wound gasketoffers a low-cost solution that has the ability to handletemperature and pressure fluctuations. Multiple plies ofmetal and filler in the spiral create a barrier that reducesthe possibility of leaks.oxidizers such as nitric or sulfuric acid.Other Metal GasketsSee page D-19 for the temperature limits of commonmetals and filler materials.Garlock manufactures a wide variety of doublejacketed, spiral-wound, metal-clad and solid metalgaskets for heat exchanger and coker applications.GRAPHONIC and Kammprofile gaskets are alsoavailable in heat exchanger configurations.Temperature and ChemicalConsiderationsBe certain that the gasket you order is as resistant aspossible to the media and temperature involved. Checkthe chemical compatibility of the metal as well as the fillermaterial for the media to be sealed. As a general rule, themetal used in either the spiral winding or double-jacketedgasket should be similar to the flange material.The compressibility of flexible graphite makes it anexcellent filler material for metallic gaskets. Flexiblegraphite may be used in services with temperatures up to850 F (450 C), though it should not be used with strongPTFE filler material provides excellent chemical resistanceat temperatures below 500 F (260 C). In accordancewith ASME B16.20, an inner ring is required when usingconventional PTFE filler materials, in order to protect thewinding from radial buckling.Operating PressureOperating pressures have a direct effect on theconstruction and selection of metallic gaskets. Higherpressures raise the potential for gasket blowout, whilelower pressure applications require a gasket design thatseals under lower bolt loads.Garlock gaskets suitable for high pressure include: Kammprofile gaskets Spiral wound gaskets with inner ring Solid metal gasketsLow pressure gaskets include: GRAPHONIC gaskets Garlock Kammprofile gaskets The Garlock EDGE gasketWARNING:Properties/applications shown throughout this brochure are typical. Your specific application should not be undertaken without independent study and evaluation for suitability.For specific application recommendations consult Garlock. Failure to select the propersealing products could result in property damage and/or serious personal injury.Performance data published in this brochure has been developed from field testing,customer field reports and/or in-house testing.While the utmost care has been used in compiling this brochure, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancelsall previous issues. Subject to change without notice.D-2
Spiral Wound GasketsManufactured in Accordancewith ASME B16.20for power generation, pulp and paper, aerospace, and avariety of valve and specialty applications.Spiral wound gaskets—made with an alternating combination of formed metal wire and soft filler materials—form avery effective seal when compressed between two flanges.A v-shaped crown centered in the metal strip acts as aspring, giving gaskets greater resiliency under varyingconditions. Filler and wire material can be changed to accommodate different chemical compatibility requirements.Fire safety can be assured by choosing flexible graphiteas the filler material. If the load available to compress agasket is limited, gasket construction and dimensions canbe altered to provide an effective seal.As set forth in ASME B16.20, all PTFE filled spiral woundgaskets will be supplied with inner rings. In addition, thefollowing higher pressure class spirals will be suppliedwith inner rings for all filler material: NPS 24 and larger 900# NPS 12 and larger 1500# NPS 4 and larger 2500#Starting in May 2008, the metricated edition of this standard recommends the use of inner rings for all graphitefilled spiral wound gaskets. However, these gaskets maybe specified without inner rings by the purchaser. Bothstyles will still be stamped ASME B16.20 compliant onthe outer guide ring.A spiral wound gasket may include a centering ring, aninner ring or both. The outer centering ring centers thegasket within the flange and acts as a compression limiter,while the inner ring provides additional radial strength.The inner ring also reduces flange erosion and protectsthe sealing element.Resiliency and strength make spiral wound gaskets anideal choice under a variety of conditions and applications. Widely used throughout refineries and chemicalprocessing plants, spiral wound gaskets are also effectiveGasket Identification MarkingsRequired by ASME B16.20Outer(Centering)RingManufacturer’s Nameor Trademark3162”3600L/PTFE316L316LOuter Ring Material(when other thanCarbon Steel)Nominal Pipe Sizeand Pressure Class(standard gaskets only)Winding Metaland Filler Material EXSEALLFInner Ring MaterialStamped on Inner Ring(when other thanCarbon Steel or PTFE)06.2ASME B1SpiralWindingInnerRingManufactured toASME B16.20D-3
Performance MetricsControlled Density Process Garlock manufacturing process ensures optimumfiller density across the gasket winding to achieveconsistent compression and superior sealability High tightness level achieved with minimal compressive load, for longer-lasting seal All SW gaskets manufactured in accordance withthe guidelines set forth in the ASME B16.20 specificationsROTT Test and ResultsTest ResultsROTT Test When compared with other spiral wound gaskets,the Garlock metallic gasket was able to achieveequivalent tightness at a lower load in all tightnessparameter values. During stress cycling, the performance of theGarlock metallic gasket gaskets was excellent,compared with other spiral wound gaskets. Purpose: Determine room temperature sealing capabilities, by measuring the sealability of a gasketat incremental gasket stress values Sample used: Two 304 SS and flexible graphitefilled 4" Class 150 ASME B16.20 spiral woundgaskets Procedure: The leak rate is measured during theloading and unloading cycles, and a tightnesscurve is generated.*Gasket Style and MaterialTraditional spiral wound gasket—304 SS and flexible graphiteGarlock spiral wound gasketGasket MaterialGarlock flexible graphite-filledspiral wound gasket (ASMEB16.20)Flexible graphite spiral woundgasketPTFE-filled spiral wound gasketFoil-reinforced flexible graphite sheetGarlock GRAPHONIC gasket"Low stress" spiral wound typegasket, flexible graphite filledGarlock Kammprofile gasketGasketConstantGb (psi)GasketConstant'a'6270.35GasketConstantGs (psi)6.22Stress Req'dfor Tightnessof 100 (psi)GasketFactor"M"GasketFactor"Y" (psi)3.0010,0003.007,500Stress Req'd Stress Req'dfor Tightness for Tightnessof 1000 (psi) of 10,000 208,54014,5703680.40.282,3245,83814,664Comparison of Seating Requirements* Gb stress at which seal is initiated; "a" the slope of the log/log tightnesscurve; Gs intersection of the unload curve with the vertical axis (Tp1)D-4Note: For a 5" OD gasket at 800 psig, Tp100 102ml / min. leakage,Tp1,000 1.02ml / min. leakage, Tp10,000 0.01 ml / min. leakage.
The Garlock EDGE BenefitsCompareRequires lower seating stressStandard spiral woundgasket shows excessiveinward buckling Seals at lower stress than conventional gaskets without an inner ring Eliminates flange damage caused by overtighteningThe patented GarlockEDGE spiral woundgasket is designed toreduce inwardbuckling Relief ports allow tighter seal at lower loadsEliminates radial buckling STABL-LOCK inner wrap construction preventssealing element from flowing into and contaminatingprocess streamTightest seal Modified guide ring ensures contact centered onraised face flange surfaces*Multiple applications Available in a dual flange (DF) design to accommodate both 150 and 300 lb flanges—reduces inventorycosts Select from a wide variety of metallic and fillermaterials with a full range of temperature capabilities** Also available in HEAT SHIELD configuration forhigh temp services above 850ºF.Seals with lower bolt loads Relief tab design provides solid seating ofcentering ring faceWithstands bolt load loss caused by thermalcyclingInner wrap construction eliminates radialbucklingPrevents catastrophic failure and potentialdamage to downstream equipment due towire unravelingGasket Style"M"and Material"Y"(psi)Gb"a"(psi)Gs(psi)Garlock EDGE with 304 stainless and 2.00flexible graphite filler5,0007930.310.4Dual Flange (DF) DesignEDGE DFContact Garlock Engineering when using the EDGE gasket on lapjoint flanges with substandard backing rings.** See chart on page D-19.* Flange150 lb.300 lb.D-5
HEAT SHIELD GasketBenefitsOutstanding fire resistance Combination of graphite filler and mica layers givesuperior fire safetyIdeal for oxidizing environments Layers of pure mica protect graphite filler and resistoxidation Good choice for plant steam drums, hydrocarboncatcrackers, hydrogen units, and exhaustmanifoldsConstruction Heat-resistant graphite filler Heat- and oxidation-resistant pure mica filler Spiral-wound wires, available in most commerciallyavailable metals Rings of any standard metal, including INCONEL*X750Flexible GraphiteFillerMica Filler(or ceramic)Mica Filler(or ceramic)OuterRingWireAlso available in Kammprofile and EDGE design* INCONEL is a registered trademark of Inco Alloys International, Inc.SpecificationsTemperature, max.:Flange class:Pipe diameters:1250 F (677 C)150 to 600 lb.2" to 24"; specials availableGasket Style and MaterialTraditional spiral wound gasket—304 SS and flexible graphiteGarlock spiral wound gasketGasketFactor"M"GasketFactor"Y" tions shown throughout this brochure are typical. Your specific application should not be undertaken without independent study and evaluation for suitability.For specific application recommendations consult Garlock. Failure to select the propersealing products could result in property damage and/or serious personal injury.Performance data published in this brochure has been developed from field testing,customer field reports and/or in-house testing.While the utmost care has been used in compiling this brochure, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancelsall previous issues. Subject to change without notice.D-6
TANDEM SEAL *BenefitsChemical-resistant and fire-safe PTFE envelope withstands a