Rubber expansion joints - Rubber expansion - joint-single wave - 2831 | Genebre

Genebre 2831 – Single Arch Rubber Expansion Joint

The Genebre 2831 is a flanged expansion joint designed for vibration absorption, noise reduction, and compensation of pipe movements in industrial piping systems. The body is constructed from EPDM reinforced with nylon, with a retaining ring and flanges made of galvanized carbon steel.

Technical Data

• Connection: Between flanges EN 1092
• PN10/16: DN32 to DN150
• PN10: DN200 to DN500
• Max operating pressure: 16 bar up to 12”, 10 bar from 14” to 20”
• Temperature range: -10 °C to +105 °C
• Burst pressure: 30 bar
• Max vacuum: 400 mbar

Pipe Movement Capabilities

Depending on size, the 2831 allows axial compression 10–28 mm, axial elongation 6–16 mm, lateral movement 9–25 mm, and angular deflection 10° or 15°. Values must be verified in conjunction with pipe anchors, guides, and thermal expansion calculations.

Suitable Applications

Used in pump stations, HVAC networks, chilled/hot water circuits, auxiliary industrial lines, and systems where EPDM is compatible with the conveyed medium. Not recommended for oils, fuels, or hydrocarbons without chemical compatibility verification.

Installation and Sealing

No additional gasket is required between the joint and pipe flanges. Bolts should be tightened crosswise, gradually, and evenly. For pump installations, maintain a distance of approximately 1–1.5 × DN from the pump nozzle.

Maintenance

No lubrication required. Inspection should focus on bolt loosening, corrosion, leakage, excessive deformation, or elastomer degradation. In case of partial or total failure, full replacement is necessary. Recommended tightening torques: 50 Nm for 1¼”–4”, 60 Nm for 5”–6”, 80 Nm for 8”–14”, 100 Nm for 16”–20”.

FAQ

Is an actuator available?
No. This is a passive piping component.

Difference from 2831A?
2831 is for DIN/EN flanges; 2831A is for ANSI 150 flanges.