Variations and optional devices for rubber expansion joints - Filled arch | Macoga

MACOGA Filled Arch – Elastomeric Expansion Joint with Filled Arch Profile

The Filled Arch configuration is specified for MACOGA elastomeric expansion joints where a smoother internal bore is required. The arch is factory-filled with a soft elastomer, bonded in place, to reduce turbulence and prevent accumulation of solids within the arch profile.

Functional Role

Filled arch designs are used in pipelines where the process fluid may carry suspended solids, sludge, salts, process slurries, or liquids prone to sedimentation. The continuous internal surface minimizes dead zones and reduces the risk of material build-up in the arch area.

Technical Characteristics

• Factory-integrated soft elastomer fill.
• Smoother internal bore compared to open arch designs.
• Continuous internal liner prevents fill detachment during operation.
• Available as a custom option for MACOGA elastomeric expansion joints.
• Material selection per media: EPDM, NBR, SBR, CSM, Neoprene, or FKM/Viton, based on chemical compatibility.

Selection Criteria

• Wastewater, sludge, slurry, and industrial liquids containing solids.
• Cooling water lines with fouling or scaling risk.
• Applications where open arch profiles may trap material.
• Systems requiring reduced turbulence inside the expansion joint.

Difference from Inner Sleeve

The filled arch creates a continuous elastomeric internal profile by filling the arch. The inner sleeve is a separate internal liner (hard elastomer, metal, or fluoroplastic) designed to reduce friction and turbulence, but is not recommended for high-viscosity fluids that may cause packing or caking in the arch area.

Installation

No additional gasket is required between the elastomeric face and pipe flange. Flanges must be flat, clean, and free of burrs. Bolting should be cross-tightened with a torque wrench. The joint must not be twisted or compressed to compensate for misalignment.

No actuator is used. Selection is based on DN, pressure, temperature, media, solids content, required movements, vacuum conditions, and anchor arrangement.