Metallic Expansion Joints - Thorburn Flex Inc

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THORBURN FLEXIBLE PIPING SPECIALIST DUAL-FLEX DFU UNRESTRAINED UNIVERSAL EXPANSION JOINT SYSTEM Thorburn's Dual-Flex Model DFU consists of two bellows joined by a common connector called a "pipe spool". However, unlike Thorburn's double joint Model DFP, this connector is not anchored to the structure. This permits Thorburn's unrestrained universal expansion joint Model DFU to absorb any combination of three basic movements: axial, lateral and angular. Model DFU is used where these combinations or single direction movements are too great to be handled by Thorburn's Single-Flex single joint. DMA HOT G MA When large amounts of lateral movement are required, Thorburn's untied universal expansion joint Model DFU is used. This type of expansion joint will also result in lower forces on the anchors. MA G DFU DMA HOT MA: Main Anchor DMA: Directional Main Anchor PG: Planar Guide G: Guide DFU: Unrestrained Universal Expansion Joint WARNING Without properly designed directional main anchors, Thorburn's Dual-Flex DFU is not recommended and Thorburn's Dual-Flex tied universal Model DFT should be used. Thorburn welder, highly trained, certified to ASME Section IX, welding a 24" Dual-Flex DFU unrestrained expansion joint system. Typical Thorburn Dual-Flex DFU unrestrained universal expansion joint system designed to accomodate up to 10" axial movement Additional points that must be considered before specifying Thorburns Dual-Flex DFU 1. For a very long expansion joint, the center spool may have to be supported. In vertical installations, the bellows or related hardware support the mass of the center spool. In horizontal installations, the bellows or related hardware are required to support the center spool mass as well as the weight of the fluid in the center spool. Therefore, it is important to specify the orientation of the universal assembly and the media when specifying Thorburn Dual-Flex DFU. 2. Specify the direction of flow for expansion joints requiring liners if the end fittings are not identical before specifying Thorburn Dual- Flex DFU. 3. Pressure thrust is a very important design consideration. For Thorburn Dual-Flex DFU, the pressure thrust force will be equal to the "Bellows Area" times the "Operating Pressure". Page 44
THORBURN FLEXIBLE PIPING SPECIALIST DUAL-FLEX DFP IN-LINE DOUBLE RESTRAINED EXPANSION JOINT SYSTEM WITH INTERMEDIATE ANCHORS Thorburn's in-line double expansion joint system is specified when the axial movement of the piping run exceeds the capability of Thorburn's Sing-Flex (Single bellows) expansion joint. Model DFP consists of two single joints joined by a common spool which is anchored to a support base (intermediate anchor) directly to the structure. Shown is one of over 20 Thorburn Dual-Flex double expansion joints installed at the Ste-Marthe du Cap-de-la-Madeleine, Quebec, project in 1991 G HOT THORBURN DFP G MA Thorburn's double expansion joint, with support foot, intermediate anchor system MA IA Thorburn Model DFP expansion joint is located in the center of the piping run and each single bellows absorbs the axial movement of the section of piping in which it is located. Thorburn Dual-Flex Model DFP being prepared for shipment Let Thorburn's flexible piping specialists provide a timely solution to your pipe motion problem! Double expansion joint with support base and protective covers Double expansion joints are typically specified on long pipe runs. Shown above is one of four installed in a steam distribution line at a paper mill. Page 45
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Metallic Expansion Joints - Thorburn Flex Inc

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