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.

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.

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).

HINGED EXPANSION JOINTS INSTALLATION SCHEMES




TWO HINGED EXPANSION JOINTS INSTALLATION

THREE HINGED EXPANSION JOINTS INSTALLATION




HINGED/GIMBAL EXPANSIONS JOINTS INSTALLATION SCHEMES




TECHNICAL TABLES
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