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Single Expansion Joint

• Single Expansion Joints has one bellow.

• Extension lateral and angular movement can be      accommodated.

• These expansion joints do not restrain the internal      pressure thrust.  

• Where small thermal movements are involved and      proper anchoring and guiding is feasible, a single expansion joint is the      most economical installation.

Single Tied Expansion Joint

• Single Tied Expansion Joints also have one bellows,      except the overall length is restrained by tie rods designed to contain      pressure thrust.

• A single tied EJ is usually designed for      lateral offset so that the tie rods can remain fully engaged and loaded      with the pressure thrust force. A two tie rod design can accept angular      deflection in a single plane.

Liners 

·       Internal liners can be used to either protect the metallic bellows from erosion or reduce turbulence across the bellows. 

Covers

·       External Covers providing a protective shield that spans the length of the bellows.  Covers prevent direct contact with the bellows, offering personnel protection, as well as protection to the bellows from physical damage such as falling objects, weld splatter or arc strikes. They also serve a purpose as insulation of the bellows.