Single Axial Tied Expansion Bellow

Product Description

A Single Axial Tied Expansion Bellow is a type of metallic expansion joint designed to absorb axial movement (i.e., compression or extension along the pipe axis), while restraining pressure thrust using external tie rods.

Components of a Single Axial Tied Expansion Bellow

Function & Characteristics

• Movement Type: Axial only (expansion and contraction along the pipe axis).

• Thrust-Restrained: Internal pressure thrust is absorbed by tie rodsïnot transmitted to adjacent pipe or anchors.

• No Lateral or Angular Movement (unless explicitly designed for limited multi-axis movement).

Applications

• Thermal expansion in straight pipe runs.

• Pump and compressor connections.

• Systems with well-defined anchor points and limited space.

• Low to medium-pressure steam, gas, or fluid systems.

Limitations

• Cannot absorb lateral or angular movement.

• Misalignment in installation can lead to premature failure.

• Tie rods must be properly aligned and tensioned to function correctly.

Typical Standards Used

• EJMA (Expansion Joint Manufacturers Association) design guidelines.

• ASME B31.3 for piping stress design.

• Materials often conform to ASTM standards (e.g., A240 for SS 316L bellows).