Untied Expansion Joint

Untied Expansion Joint Designs

Untied Expansion Joints

Most Common Types:

Axial Expansion Joints

Double Expansion Joint

Internally Guided Expansion joint

Untied Universal Expansion Joints

Pressure Balanced Expansion Joint

Features :

Single or dual bellows with installation fittings only

Commonly used for low pressure service

Simple design= less expensive

All degrees of freedom(axial, lateral, angular)

Incur pressure thrust onto pipe

Anchors affected by bellows spring rate and pressure thrust=higher force

Basic Expansion Joint Designs

Untied=Pressure Thrust

Single (axial)

Expansion Joint

               Axial ,lateral & angular movements

Universal(untied)

Expansion Joint

                Large axial , lateral & (angular)movements