EXPANSION JOINTS

axial

universal

hinghed

gimbal

lateral

spheric lateral

pressure balanaced axial

pressure balanced universal

Tipi di compensatori
Tabelle compensatori
Progettazione
Materiali
   Dilatazioni
Fattore correzione
Dilatazione termica
Collaudi
Accessori

Hinged/Spherical hinged (or gimbal)

They both are balanced expansion joints able to absorb the end thrust due to the internal pressure.

Scheduled executions

WH Hinged	They allow the rotations around the axle that coincides with the axle of the tie-bar.
WG gimbal	They allow the rotations around the axle perpendicularly arranged to the bellows.

Materials

Bellows Pipe ends Pins Tie-bar

ASTM A 240 Tp. 321
ASTM A 240 Tp. 316 316L
Fe 410.1 KW ASTM A 193 Gr. B7 Fe 410.1 KW

Construction

The hinged expansion joints (WH) are composed of bellows having two couples untied tie-bar.
The gimbal expansion joints (WG) are composed of bellows having four untied tie-bar.I

Rules of installation

WH - The side move born from a couple of hinged expansions joints is proportional to the mutual distance, so, more the two joints are distant, greater it will be the side move.
As you can observe from the following sketches, hinged expansion joints always are installed in couple or in set of three numbers, so that they can absorb side moves, in one or more direction in comparison to the plan of the pipeline.
Their installation allows to reduce in evident way the stress produced on the fixed points.

WG - These expansion joints have to be installed in couple, or together with an hinged expansion joint (see sketch).