Expansion Joints

Pipe expansion joints are used to absorb axial, lateral, or angular movements caused by thermal expansion, vibration, support settlement, or small equipment displacements in steam, water, gas, compressed air, and process fluid systems. This category includes metallic expansion joints such as Comeval TORAFLEX S50/S25 and Macoga series including MWA, MTI, MTE, MRR, MQP, PTFE, MW, MR, MF, pressure balanced MPBI/MPBE, MJA, LENS, Two Ply, and Dog Bone.

Selection is based on calculated thermal movement, pressure rating, operating temperature, service medium, direction of movement, anchoring requirements, pipe guides, bellows fatigue life, and allowable nozzle loads on connected equipment. In steam systems, condensate drainage, water hammer risk, fixed point location, and access for inspection of bellows, limit rods, flanges, and welds should also be checked.

TORAFLEX S50/S25 are metallic flexible elements designed for axial thermal movement absorption, with Omega-type corrugated bellows and an internal sleeve to reduce wear and flow turbulence. Type S25 is supplied with weld ends, while type S50 is supplied with flanged ends; S50 also incorporates limit rods as standard. Referenced sizes are DN20 to DN600, typically in PN10 to PN16 pressure classes, with stainless steel construction and use in HVAC, steam, gases, lubrication lines, compressed air, and process services.

Pressure balanced designs such as MPBI are applied where axial and/or lateral movement must be absorbed while limiting pressure thrust in straight piping runs. For chemically aggressive media, PTFE expansion joints should be considered. Special configurations such as Lens, Two Ply, and Dog Bone are selected according to pressure, temperature, operating cycles, available installation length, and inspection requirements.

Metal expansion joints, flanged or butt weld ends BW TORAFLEX - S50 / S25 | Comeval - Comeval

Metal expansion joints, flanged or butt weld ends BW TORAFLEX - S50 / S25 | Comeval

Metal expansion joints, flanged or butt weld ends BW TORAFLEX - S50 / S25 | Comeval
Comeval
Toraflex S50 / S25 Axial Expansion Joints – Comeval Metallic axial expansion compensators for rigid piping systems, engineered to absorb axial thermal movement. Construction features an Omega-type convoluted bellows and internal sleeve to prevent direct flow contact with the corrugated surface. Installation is unidirectional and must follow the indicated...
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Expansion Joints - Type MWA | Macoga - Macoga

Expansion Joints - Type MWA | Macoga

Expansion Joints - Type MWA | Macoga
Macoga
Macoga MWA Axial Expansion Joints The Macoga MWA series are metallic axial expansion joints of the single unrestrained type, featuring a single convoluted bellows and weld ends. They are primarily used to absorb axial thermal expansion in straight pipe runs. The allowable movement is determined by project-specific design parameters. Design Considerations...
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Expansion Joints - Type MTI | Macoga - Macoga

Expansion Joints - Type MTI | Macoga

Expansion Joints - Type MTI | Macoga
Macoga
Macoga MTI Axial Expansion Joints Macoga MTI are metallic axial expansion joints of the single unrestrained type, featuring a single bellows and internal BSP or NPT threads for connection to small-bore piping systems. They belong to the same family as MWA, MFA, MFG, MTE, and MQP, but are distinguished by their threaded internal connection. Network...
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Expansion Joints - Type MTE | Macoga - Macoga

Expansion Joints - Type MTE | Macoga

Expansion Joints - Type MTE | Macoga
Macoga
Macoga MTE Axial Expansion Joints Macoga MTE are metallic axial expansion joints, single unrestrained type, featuring a single convoluted bellows and external BSP or NPT threads. The threaded connection is suitable for small bore piping where flanged or welded ends are not specified in the piping class. Operation and Limitations MTE type is primarily used...
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Expansion Joints - Type MRR | Macoga - Macoga

Expansion Joints - Type MRR | Macoga

Expansion Joints - Type MRR | Macoga
Macoga
Macoga MRR Expansion Joints Macoga MRR are metallic expansion joints designed for high internal pressure applications. Reinforcement rings are positioned around the bellows convolutions to support the root area and limit deformation under pressure loads. Construction and Movements The MRR series can be configured for axial, lateral, or angular movement...
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Expansion Joints - Type MQP | Macoga - Macoga

Expansion Joints - Type MQP | Macoga

Expansion Joints - Type MQP | Macoga
Macoga
Macoga MQP Axial Expansion Joints The Macoga MQP is a metallic axial expansion joint, single unrestrained type, with quick press end connections. It is designed for HVAC heating, ventilation, and air conditioning networks. The construction features a single metallic bellows with quick press ends, primarily used to absorb axial pipe movements resulting...
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Expansion Joints - Type PTFE | Macoga - Macoga

Expansion Joints - Type PTFE | Macoga

Expansion Joints - Type PTFE | Macoga
Macoga
Macoga PTFE Lined Expansion Joints Macoga PTFE expansion joints are designed with PTFE (polytetrafluoroethylene) lining on all wetted surfaces. These assemblies are specified for piping systems conveying chemically aggressive media where direct contact between the process fluid and metallic components must be avoided. Macoga offers PTFE lining for both...
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Expansion Joints - Type MWY | Macoga - Macoga

Expansion Joints - Type MWY | Macoga

Expansion Joints - Type MWY | Macoga
Macoga
Macoga MWY Lateral Expansion Joints Macoga MWY are metallic double hinged expansion joints with weld ends. The assembly consists of two bellows connected by an intermediate pipe and a hinge system. Designed to absorb lateral and angular movements in a single plane, these joints are not intended for axial displacement. Operation and Load Handling The hinge...
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Expansion Joints - Type MWT | Macoga - Macoga

Expansion Joints - Type MWT | Macoga

Expansion Joints - Type MWT | Macoga
Macoga
Macoga MWT Axial Expansion Joints Macoga MWT are metallic axial expansion joints of the single tied type, featuring a single bellows, weld ends, and a tie rod restraint system. The flanged version of this series is designated MFT and is supplied with fixed flanges. Network Operation Tie rods limit pressure thrust, reducing main anchor requirements...
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Expansion Joints - Type MWP | Macoga - Macoga

Expansion Joints - Type MWP | Macoga

Expansion Joints - Type MWP | Macoga
Macoga
Macoga MWP Hinged Expansion Joints The Macoga MWP series are metallic expansion joints with a single bellows, welded ends, and a hinged system. The corresponding flanged version is designated MFP. The hinge mechanism allows angular movement in a single plane and is not intended for axial or multi-plane lateral displacement. Operation in Piping Systems The...
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Expansion Joints - Type MWL | Macoga - Macoga

Expansion Joints - Type MWL | Macoga

Expansion Joints - Type MWL | Macoga
Macoga
Macoga MWL Lateral Expansion Joints Macoga MWL are metallic expansion joints of the universal lateral tied type, supplied with welded ends. The assembly consists of two bellows, an intermediate pipe, and a tie rod system designed to absorb the pressure thrust generated by internal pressure. The corresponding flanged version is designated as MFL. Operation...
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Expansion Joints - Type MWK | Macoga - Macoga

Expansion Joints - Type MWK | Macoga

Expansion Joints - Type MWK | Macoga
Macoga
Macoga MWK Expansion Joints Macoga MWK are metallic expansion joints of the double articulated type, featuring two bellows, an intermediate pipe, and weld ends. The flanged version is designated as MFK. These assemblies are designed for lateral movements in any direction and angular movement in a single plane. Operation and Load Management The MWK...
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Expansion Joints - Type MWCD | Macoga - Macoga

Expansion Joints - Type MWCD | Macoga

Expansion Joints - Type MWCD | Macoga
Macoga
Macoga MWCD Expansion Joints Macoga MWCD expansion joints are metallic double gimbal type compensators, featuring two bellows, an intermediate pipe, and a dual cardan/gimbal system. They are available with weld ends or flanges and are designed to absorb lateral and angular displacements in any direction. Operation and Loads The MWCD transfers pressure...
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Expansion Joints - Type MWC | Macoga - Macoga

Expansion Joints - Type MWC | Macoga

Expansion Joints - Type MWC | Macoga
Macoga
Macoga MWC Gimbal Expansion Joints The Macoga MWC is a metallic expansion joint of the gimbal type, supplied with welded ends. It incorporates two pairs of hinges mounted on a common floating gimbal ring, allowing the bellows to accommodate angular movement in any plane. The corresponding flanged version is designated MFC. Operation and Limitations The...
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Expansion Joints - Type MUX | Macoga - Macoga

Expansion Joints - Type MUX | Macoga

Expansion Joints - Type MUX | Macoga
Macoga
Macoga MUX Expansion Joints Macoga MUX are metallic expansion joints of the thick wall type, featuring a high convolution profile and fabricated from single-ply heavy gauge metal sheet. These units are specified where piping or equipment conditions require a robust bellows geometry, as opposed to conventional thin-wall designs. Technical Specifications...
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Expansion Joints - Type MRW | Macoga - Macoga

Expansion Joints - Type MRW | Macoga

Expansion Joints - Type MRW | Macoga
Macoga
Macoga MRW Rectangular Expansion Joints Macoga MRW are rectangular metallic expansion joints featuring V-shaped convolutions and a camera corner geometry. They are designed for air ducts, exhaust gas ducts, and rectangular piping systems operating under low positive pressure or vacuum. End connections are available as flanged or weld ends, depending on...
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Expansion Joints - Type MRV | Macoga - Macoga

Expansion Joints - Type MRV | Macoga

Expansion Joints - Type MRV | Macoga
Macoga
Macoga MRV Rectangular Expansion Joints Macoga MRV are rectangular metallic expansion joints featuring V-shaped convolutions and miter corners. Corners can be single or double mitered. Connection options include flanged ends or weld ends, depending on duct configuration and project requirements. Operating Range The MRU / MRW / MRV series is designed...
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Expansion Joints - Type MRU | Macoga - Macoga

Expansion Joints - Type MRU | Macoga

Expansion Joints - Type MRU | Macoga
Macoga
Macoga MRU Rectangular Expansion Joints Macoga MRU are rectangular metallic expansion joints featuring U-shaped convolutions and rounded corners. They are specified for ducting and rectangular ductwork where absorption of thermal movement is required in non-standard cross-sections. Each unit is engineered to order based on duct dimensions, design...
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Expansion Joints - Type MPBI Inline pressure balanced | Macoga - Macoga

Expansion Joints - Type MPBI Inline pressure balanced | Macoga

Expansion Joints - Type MPBI Inline pressure balanced | Macoga
Macoga
Macoga MPBI Inline Pressure Balanced Expansion Joints Macoga MPBI are metallic inline pressure balanced expansion joints designed for straight pipeline sections. The assembly absorbs axial or lateral movements while minimizing the transmission of pressure thrust to piping, pumps, turbines, or other sensitive equipment. Operating Principle The construction...
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Expansion Joints - Type MPBE Elbow pressure balanced | Macoga - Macoga

Expansion Joints - Type MPBE Elbow pressure balanced | Macoga

Expansion Joints - Type MPBE Elbow pressure balanced | Macoga
Macoga
Macoga MPBE Elbow Pressure Balanced Expansion Joints Macoga MPBE units are metallic pressure balanced elbow expansion joints designed for installation at pipeline direction changes. The assembly absorbs axial and/or lateral movements while simultaneously balancing the thrust force generated by internal pressure. Operating Principle The design incorporates...
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Expansion Joints - Type MJA | Macoga - Macoga

Expansion Joints - Type MJA | Macoga

Expansion Joints - Type MJA | Macoga
Macoga
Macoga MJA Jacketed Expansion Joints Macoga MJA expansion joints are metallic, jacketed type units with two bellows: an inner bellow for the process medium and an outer bellow for the heating, cooling, or thermal maintenance jacket. These assemblies are specified where conventional insulation is insufficient or where the process medium must be maintained...
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Expansion Joints - Type MFY | Macoga - Macoga

Expansion Joints - Type MFY | Macoga

Expansion Joints - Type MFY | Macoga
Macoga
Macoga MFY Hinged Expansion Joints Macoga MFY are metallic expansion joints of the double hinged type with flanged ends. Construction includes two bellows, an intermediate pipe, and a dual hinge system. Designed to absorb lateral and angular movements in a single plane. Operation and Load Management The hinge assemblies absorb pressure thrust, eliminating...
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Expansion Joints - Type MFT | Macoga - Macoga

Expansion Joints - Type MFT | Macoga

Expansion Joints - Type MFT | Macoga
Macoga
Macoga MFT Axial Expansion Joints Macoga MFT are metallic axial expansion joints of the single tied type, featuring a single bellows, fixed flanges, and tie rod assemblies. The welded-end variant is designated as MWT. Operation Tie rods absorb the pressure thrust, preventing the unit from acting as an unrestrained axial compensator. The MWT/MFT series is...
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Expansion Joints - Type MFP | Macoga - Macoga

Expansion Joints - Type MFP | Macoga

Expansion Joints - Type MFP | Macoga
Macoga
Macoga MFP Hinged Expansion Joints Macoga MFP are metallic expansion joints with a single bellows, equipped with hinged assemblies and flanged ends. The welded-end variant is designated MWP. The hinge system allows angular movement in a single plane and is not intended for axial or lateral displacement when used as a single unit. Operation and Load...
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