Full Face Rubber Flanged Expansion Joints - MAC-FT | Macoga

MACOGA MAC-FT – Full-Face Elastomeric Expansion Joint with Tie Rods

The MAC-FT is a restrained full-face elastomeric expansion joint equipped with tie rods to absorb pressure thrust. It is specified where pipe anchors or supports are not designed to withstand the axial forces generated by internal pressure.

Construction

• Full-face elastomeric body with metallic backing flanges.
• Split or fixed flanges in painted carbon steel, galvanized, or stainless steel.
• Drilling patterns per EN, ANSI, AWWA, JIS, or project-specific requirements.
• Single or multiple convolution elastomeric section.
• Custom dimensions available, full-face series from DN15 to DN6000.

Tie Rod Function

Tie rods are installed flange-to-flange and define the maximum allowable extension or compression. They absorb the entire pressure thrust, preventing load transfer to mating flanges. Double nuts limit over-extension, while spherical washers allow lateral and limited angular movement, especially in 2-tie rod configurations.

Materials and Compatible Media

• EPDM: water, hot water, seawater, oil-free air.
• EPDM HT: applications up to 140 °C.
• NBR: oils, fuels, hydrocarbons, gases; not suitable for steam or hot water.
• SBR / Natural Rubber: sludge, wastewater, liquids with solids.
• FKM / Viton: hydrocarbons, oils, solvents, chemicals up to 150 °C.

Installation and Sealing

The full-face elastomeric surface seals directly to the pipe flange; no additional gasket is required. Flanges must be flat, clean, and free of burrs. Bolts should be tightened crosswise using a torque wrench. Initial commissioning includes leak and tie rod performance checks.

Difference from MAC-F

The MAC-F is unrestrained and requires external anchoring for pressure thrust. The MAC-FT integrates tie rods and is used where axial movement or loads must be limited within the piping system. No actuator is included.