Design and manufacturing of metal expansion joints for industrial piping systems

At Bikar Expansion Joints, we have completed the design and manufacturing of metal expansion joints for an industrial piping system, providing a reliable solution for absorbing significant axial movements and controlling stresses in the line.

For this application, BM-UN-EX-TI universal metal expansion joints were engineered to operate under low-pressure conditions and moderate temperatures, ensuring safe and long-term performance of the installation.

In general, metal expansion joints are used in Energy, Oil & Gas and Industrial applications, and are commonly installed in refineries, petrochemical plants, shipyards and similar facilities. Their main function is to absorb movements, vibrations and stresses in piping systems handling fluids at temperatures up to 1200 °C (2200 °F) and standard pressures up to 100 bar (1500 psi), protecting critical equipment and maintaining system integrity.

Design and operating conditions:

Expansion joint type: BM-UN-EX-TI
Nominal size: 14″
Overall length: 1310 mm
Design pressure: 3.5 bar (g)
Maximum test pressure: 5.25 bar (g)
Design temperature: 175 °C
Axial movements:
+20 mm / −180 mm

Materials used:

Bellows: AISI 321
Internal liner: AISI 304 / 304L
External cover: carbon steel, hot-dip galvanized
The expansion joints are supplied with control tie rods.

BM-UN-EX-TI universal metal expansion joint

Universal expansion joints consist of two single bellows separated by an intermediate pipe. This configuration provides a high capacity to absorb axial and lateral movements, making them particularly suitable for piping systems where flexibility and controlled loads are required.

The absorption capacity depends on the bellows design and the length of the intermediate section. A longer intermediate pipe increases movement capability, while any thermal expansion of this section is also compensated by the bellows.

Main characteristics:

Suitable for low-pressure applications
High axial and lateral movement absorption
Pressure thrust balanced by control rods

Fixed anchors can be reduced or avoided when piping is properly guided
This project highlights BIKAR’s engineering capability in the design and manufacturing of metal expansion joints, delivering customized solutions that combine mechanical strength, flexibility and operational reliability.

For further information about our metal expansion joints or technical support, please contact us at info@bikarexpansionjoints.com.