EXTERNALLY PRESSURISED EXPANSION JOINTS

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.

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 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.

As the convolutions 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.

DIMENSIONS

The externally pressurised expansion joints are customised solutions and are available in all dimensions, all sizes
and all materials.

EXTERNALLY PRESSURISED EXPANSION JOINT PROJECTS

SPECIAL DESIGN

District heating pipeline, Germany

DESIGNED WITH DRAIN

District heating pipeline, Germany

SPECIAL DESIGN

District heating pipeline, Germany

DESIGNED WITH DRAIN

District heating pipeline, Germany

3 PCS SAME DESIGN

District heating pipeline, Germany

TIED EXTERNALLY PRESSURISED EXPANSION JOINT

District heating pipeline, Germany

3 PCS SAME DESIGN

District heating pipeline, Germany

TIED EXTERNALLY PRESSURISED EXPANSION JOINT

District heating pipeline, Germany

EXCELLENCE IN

EXTERNALLY PRESSURISED EXPANSION JOINT ENGINEERING

Belman external pressurised expansion joints
TECHNICAL DESCRIPTION

Cover
The 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.

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

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