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Typical Causes of Metal Expansion Joints and Metallic Compensators Failure

Most common sources of failure or malfunctioning in metal expansion joints and metallic compensators

 

The metal expansion joints and metallic compensators are those parts of the piping that can provide many years of reliable service, as long as they have been designed and manufactured in well manner in accordance with the project specifications.

 

Our know-how designing and manufacturing metal expansion joints and compensators since 1978, has shown us that certain breakdowns rest most of the time with the same mistakes or incidences, such as those set out in the following sections.

Damages during transportation and handling of the expansion joints

Dents and deformation of the bellows due to the impact of objects and structures (tools, chains, conveyors, surrounding constructions, etc.)

Wrong stacking on site for storing or prior to transportation.

Inadequate protection against poor weather conditions.

 

Improper installation and insufficient protection during and after the setting-up of the expansion joints

Expansion joints with inner sleeves that are placed opposite to flow direction.

Placement of the metal expansion joints or compensator in a different location to that stated on the erection drawings.

Early dismantling of the transportation and packaging accessories and protections.

Twisting of the bellows to accommodate misalignments of the piping.

Inadequate protection against mechanical damages coming from the surrounding area.

Insufficient protection against welding tasks carried out in the area around the bellows.

Premature removal of shipping devices and packing.

 

Damage resulting from improper installation

Damage resulting from improper installation

 

Anchorings, guiding and piping supports that are unsuitable for the expansion joint

 

Failure of the anchorage during operation

Corrosion of the bellows

Inappropriate choice of the material of the bellows to be in contact with the fluid and/or external environment. In particular, one of the most common sources of corrosion in the stainless steel bellows is the presence of chlorides leaking from the insulation.

Stress corrosion cracking.

 

We recommend you to contact with the materials supplier in order to do the right decision about the choice of materials.

 

Overpressure of the system (during normal operation or hydraulic test)

Vibration of the bellows (of mechanical origin or caused by the flow stream) that can lead to fatigue failure

Thermal expansion exceeding the expected design figures

Erosion of the bellows

This can be observed in expansion joints that are placed in high-speed pipings having no inner sleeve in the bellows.

 

Accumulation of undesired particles in the waves of the bellows, hindering a proper functioning of the expansion joint

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