Flue Duct Expansion Joints Flue Duct Expansion Joints - Effox-Flextor

Flue DuctExpansion Joints

CapabilitiesIn-house engineering and fabricating capabilities enableEFFOX to provide unique and specialized equipment to themarketplace. Our EFLEX expansion joints reflect the highestengineering standards and professional workmanshipdemanded by all EFFOX customers.Industries throughout the world rely on EFLEX expansion jointswell-earned reputation for reliability and performance.• Power Generation- Coal or Oil Fired- Gas Turbine- Cogeneration- Selective Catalytic Reduction (SCR)- Flue Gas Desulfurization (FGD)• Pulp and Paper• Refineries:- Petro-Chemical- Chemical• Steel Mills• Foundries• Smelters• Cement• HVAC - Heating, Ventilating and Air Conditioning• Industrial AutomotiveCommitmentOur objective is to continue building upon EFFOX’s reputationas a world leader in the expansion joint and damper markets.Our experienced engineering staff and fabrication facilitiesenables EFFOX to meet customer requirements with qualityproducts at the lowest total cost and delivered according toour customer’s schedule.We monitor every phase of our operation - from engineeringthrough shipment - with quality guidelines that strictly adhereto the product specifications and comply with our auditedQuality Assurance Program. Our quality assurance planparallels the ISO 9001 guidelines. All welding processes arequalified per AWS D1.1 and ASME Section IX.

Flue Duct Expansion JointsThe primary purpose of an expansion joint is toprovide a point of flexibility in flue ducts andrelieve stress caused by system movement.The design parameters which influence theperformance of any expansion joint and which must bedefined for proper design analysis include:• Movements• Design / Operating Temperature• Design / Operating Pressure• Flue Gas CompositionA properly designed expansion joint successfullyaccommodates operating factors that include:• Absorption of Vibration orShock• Minor Misalignment ofDuctworkBenefits of Non-metallic Expansion JointsNon-metallic expansion joints incorporate the latestadvancements in engineering and materials providing bothsuperior technical and commercial benefits:Technical:• Axial & lateral concurrent movements• Superior corrosion resistance• Vibration reduction• No end loading on attachment flangesCommercial• Lower material costs• Lower shipping costs• Lower installation costs• Reduced replacement costs• Face-to-face reduction

Types of Non-Metallic Expansion JointsCompositeComposite expansion joints consist of layers of material bonded, sewn ormechanically fastened together along the edges. Each layer of material is designed tofunction independently of the others.EFLEX Fluoroflex composite expansion joints are recommended fortemperature applications from 400ÞF (204ÞC)to in excess of 2000ÞF (1093ÞC).EFLEX Fluoroflex material used as the outer layer of the compositeexpansion joint consisting of a fluoropolymer fiberglass product with asecondary corrosion barrier of cross-plied PTFE resulting in a superiorchemical resistant product with ZERO porosity.Outside Cover LayerFluoroflex - PTFE liner laminated to a PTFE/fiberglass composite productdesigned for wet and corrosive services.TFE LayerCross-plied PTFE, highly resistant to chemicals, serves as a vapor (gas)barrier.Fiberglass / Cloth LayerVermiculite coated fiberglass fabric acts as an insulator and providesexpansion joint durability and strength.Insulation LayerProtects the cover and vapor barrier from heat degradation. Thethickness of this layer is determined by the system temperature to ensurethat the heat transfer from the flue gas is reduced to a point less thanthe maximum temperature of the cover and the vapor barrier.Fiberglass / Cloth LayerVermiculite coated fiberglass fabric acts as an insulator andprovides expansion joint durability and strength.Inside Layer / TubeClose weave material binds the belt together, acts as an insulatorand gives the belt a finished appearance. The edge of this layer is hemmed and rolled over the edge of theexpansion joint to form a cuff. This cuff establishes a barrier between the cover and the back-up bars, protectingthe cover from any excessive heat that may be conducted into the back-up bar through the fasteners.ElastomericElastomeric material is laminated with one or more reinforcing plies and vulcanized into a homogeneousproduct.Elastomeric expansion joints are used in flue ducts operating at or below 400ÞF (204ÞC). Material selectionis based on maximum duct temperatures detailed below:NeopreneHypalon ®ButylEPDMFluoroelastomerViton ® , Fluorel ®220ÞF (104ÞC)250ÞF (121ÞC)300ÞF (149ÞC)300ÞF (149ÞC)400ÞF (204ÞC)

Expansion Joints Design GuidelinesExpansion Joints ProfilesMovementsBelt TypeThis expansion joint profile is mountedparallel to the plane of the duct.Axial CompressionThe dimensional shorteningof the expansion jointface-to-face gap parallelto its longitudinal axis."U" Design - Integrally Flange TypeThis expansion joint profile incorporates itsown flanges which are perpendicular tothe plane of the duct.Double Flow LinerThe double flow liner is used in systemswith large duct movements andelevated temperatures.Single Flow LinerIn positive flue gas systems with flushmount composite designs, baffles arerecommended to extend the life of theexpansion joint. In negative systems, asingle flow liner is used to prevent thejoint from being pulled into the flowcausing the joint to fail prematurely fromflutter and erosion.Insulation PillowAn insulation pillow is recommended forall composite joints continuously operatingat temperatures 800ÞF (426ÞC) andabove. The insulation pillow keeps belttemperatures down and increases theservice life of the joint. The pillow consistsof fiberglass or ceramic fiber (determinedby flue gas temperature) encased in hightemperature fabric and/or stainless steelmesh. An insulation pillow is also suppliedin heavy fly ash environments to preventash buildup between the flow liner andthe expansion joint.Axial ExtensionThe dimensional lengtheningof the expansion jointface-to-face gap parallelto its longitudinal axis.LateralThe dimensional displacementof the inlet and theoutlet flanges of theexpansion joint perpendicularto its longitudinal axis.Torsional RotationThe twisting of one (1) endof the expansion joint withrespect to the other endabout its longitudinal axis.Angular RotationThat movement whichoccurs when one (1)flange of the expansionjoint is moved to an out-ofparallelposition with theopposite flange.

Expansion Joints Specification SheetBasic ConfigurationsItem Number I II IIIApplicationType Metallic / Non-Metallic Joint1Configuration Number (see right)QuantitySize2Breach OpeningMovementTemperaturePressureDuct MaterialAxial Compression (inches)Axial Extension (inches)Lateral (inches)Design (ÞF)Operating (ÞF)Design (inches W.G.)Operating (inches W.G.)345Liner - Baffle / Shield (yes - no)Insulation Pillow (yes - no)Assembled (yes - no)6Flowable Movements for Belt Type Expansion JointsActive Length 6” 9” 12” 16”Movement Ext. Comp. Lat. Ext. Comp. Lat. Ext. Comp. Lat. Ext. Comp. Lat.Inches 3/ 4 ” 2” 1 1 / 4 ” 3/ 4 ” 3” 2” 3/ 4 ” 4” 2 3 / 4 ” 3/ 4 ” 6” 3 1 / 2 ”7Belt TypeBelt Type“U” Design8Allowable Movements for “U” Design Expansion JointsBreach Opening 5 1 / 2 ” 8 1 / 2 ” 11” 15”9Joint Face to Face 6” 9” 12” 16”Movement Ext. Comp. Lat. Ext. Comp. Lat. Ext. Comp. Lat. Ext. Comp. Lat.Inches 1/ 2 ” 1 1 / 2 ” 1” 1/ 2 ” 2 3 / 4 ” 1 3 / 4 ” 1” 3 3 / 4 ” 2 1 / 2 ” 1” 5 1 / 2 ” 3 1 / 2 ”10

A World of SolutionsA World of ServiceA World of Benefits• Worldwide operating experience• Financial stability• Leading edge design andengineering• Fully equipped manufacturingfacility in the U.S.• Worldwide manufacturingcapability• Domestic and International fieldservice capability•Quality Assurance ProgramQuality assurance is in accordance with ISO 9001 guidelines.All welding processes are qualified per AWS D1.1 and ASMESection IX.•Product TestingWe have the ability to test our products at temperatures upto 1500ºF (815ºC)and at system operating pressure.•Retrofit/Repair CapabilityField service is available worldwide from our global fieldservice network for repairs, alterations or replacementregardless of the original manufacturer.Slide Gate DampersIsolation capability withminimum pressure dropacross the dampers.Available in low leak andzero leak designs.Louver DampersParallel blade design offerstight shut-off. Opposedblade design offers flowcontrol capability. Doubleand tandem louver designsoffer zero leak isolation.DivertersProvides extremely highsealingefficiency in systemsthat require a through flowwith bypass capabilities.Commonly used in HRSGapplications.WafersCost-effective tight shutoffcapability for roundducts.Radial Vane DampersFan inlet controlcapability.Stack IsolationDampersCost-effective shut-off andweather protectioncapability. Commonlyused in HRSG and industrialboiler applications.Worldwide HeadquartersEFFOX Inc.9759 Inter Ocean DriveCincinnati, Ohio USA 45246513-874-8915Fax 513 - 874 -1343www.effox.comE-Mail: sales@effox.comMetallic ExpansionJointsApplications for highpressure and hightemperature designswhich are beyond thecapabilities of nonmetallicjoints.