Full Face Rubber Flanged Expansion Joints - MAC-FR / Rectangular | Macoga

Name: Full Face Rubber Flanged Expansion Joints - MAC-FR / Rectangular | ...
Brand: Macoga
SKU: Full Face Rubber Flanged Expansion Joints - MAC-FR / Rectangular | Macoga

MACOGA MAC-FR – Rectangular Elastomeric Full-Face Flange Expansion Joint

The MAC-FR is a rectangular-section elastomeric expansion joint designed for ductwork, flue gas lines, and rectangular piping systems operating under low positive or negative pressure. Typical applications include power generation, chemical, petrochemical, and steel plants.

Design and Construction

Each MAC-FR is engineered per application, as rectangular cross-sections are not standardized like circular piping. Units can be manufactured with one or multiple convolutions, depending on required movement and available installation length.

Type: Single unrestrained, full-faced rubber flange.
Movements: Axial, lateral (single or multi-plane), angular (single or multi-plane).
Connection: Elastomeric full-face flange with metallic backing flanges.
Flange drilling: EN, ANSI, AWWA, JIS, or project-specific patterns.
Design standards: FSA Non-Metallic Expansion Joints Technical Handbook, ASTM F1123, PED 2014/68/EU for declared operating conditions.

Anchoring and Pressure Thrust

The MAC-FR is unrestrained and does not absorb axial force from internal pressure. Piping systems must include properly calculated main and directional anchors, as well as alignment guides.

Materials and Media Compatibility

Elastomer selection is based on temperature, chemical compatibility, and presence of solids:

EPDM: Water, hot water, seawater, oil-free air, non-hydrocarbon chemicals.
NBR: Oils, fuels, gases, solvents; not suitable for steam or hot water.
SBR/Natural Rubber: Wastewater, sludge, suspended solids.
FKM/Viton: Hydrocarbons, oils, solvents, chemicals at elevated temperatures.

Installation

Not intended for misalignment correction. Flanges must be flat, clean, and burr-free. No additional gaskets between elastomer surface and pipe flange. Tighten bolts in a cross-pattern using a torque wrench.

FAQ

Does it have an actuator?
No. It is a passive piping component.

When is MAC-FR selected?
For rectangular ductwork requiring movement absorption with non-standard geometry, low positive pressure, or vacuum service.

Datasheet and documents

Description

Rectangular Expansion Joints are generally designed for low positive pressure and vacuum applications in the power, chemical, petrochemical, and steel

industries.

These expansion joints can be fabricated with single and multiple arches. Due to the fact that there are no standard dimensions for rectangular pipes, each rectangular expansion joint is custom designed. They can be built with more than one convolution.

Regardless of accessories, such as tie rods, hinges, liners, covers, etc. these models absorb all the movements in any one length of piping, but are mainly used to absorb axial movements. Like circular expansion joints, unrestrained units do not contain pressure thrust so adequate anchors and guides must be provided, and they can be used only in piping systems that incorporate correctly designed anchors and pipe alignment guides.