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EXTERNALLY PRESSURISED EXPANSION JOINTS’s TECHNICAL INFORMATIONS.

Drain
In order to avoid corrosion, it may be desirable to have the capability to drain the medium surrounding the externally pressurised expansion joints. This is possible with this expansion joint design.

Cover

Externally pressurised expansion joints’s cover is often subject to relatively high stresses through the combination of diameter and pressure with the choice of material for the cover being based on the operating conditions.
In some cases, high strength steel can minimise the total weight of the unit compared to regular steel types.

As the convolutions of externally pressurised expansion joints are well protected under a cover, transport damage to the convolutions is unlikely to occur but most importantly, the cover offers maximum protection against leaking bellows or bellows failure.

External pressure balanced corrugated compensator is a kind of equipment that fundamentally solves the thrust problem of blind plate force on fixed support, simplifies the design and construction of fixed support and reduces the project cost.

Externally pressurised expansion joints are the perfect solutions when the expansion joints must absorb very large axial movements under high pressure. In principle, there are no limits to the size of axial movement that can be absorbed by this type of expansion joint.

The external pressure balanced corrugated compensator can compensate the axial displacement in the pipeline system, and the external pressure thrust is self balanced. The structure can be used in the high object position pipeline where the fixed support is not suitable.

In externally pressurised expansion joints, the bellows element(s) is arranged so that the media flow is on the external side of the bellows, while the inside part of the bellows is only subjected to atmospheric pressure with this side being in direct connection with the atmosphere. External pressurising of the bellows eliminates pressure instability as a design limitation and permits the absorption of large axial compression. Where an internally pressurised bellows will become unstable and buckle due to internal pressure, the pressure around an externally pressurised bellows will have a stabilising effect on the bellows. This makes it possible to achieve a construction of externally pressurised expansion joints with great flexibility for large axial compensation. With only the outside of the bellows subjected to pressure and the convolutions packed under a cover, the perfect conditions for external insulation or underground installation can be achieved