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Metallic Expansion Joints

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Metallic Expansion Joints

Metallic Expansion Joints

Product Parameters

Product Name Metallic Expansion Joints
Item No. 3-8 CDI-200, CDI-300
Supply Type Sell
Category Industrial Supplies Hardware > Mechanical Parts > Single Expansion Joint

Detailed Product Description

1. Definition:

1.1 Expansion joint:
Expansion joint, expansion compensator or movement joint is any assembly device, which contains one or more bellows (Bellows description is to be found in our product “metal bellows”).
Expansion joint is used to absorb dimensional changes, such as those caused by thermal/heat induced expansion or contraction of a pipeline, duct or vessel.

1.2 Single expansion joint:
Single expansion joint is the simplest form of expansion joint, of one single bellows construction with end connections, for the purpose of absorbing axial movement and a small amount of lateral movement of the pipe section in which it is installed.

2. End connections:

2.1 Flange end connections:
The end connections of an expansion joint are equipped with flanges for the purpose of bolting the expansion joint to the mating flanges of adjacent equipment or piping. It divides into fixed flange and lap-joint flange. The lap-joint flange offers rotatable function for coordinating deviation from threaded holes and flange holes and protection against corrosion, because there is no direct contact with the media.

2.2 Weld end connections:
The weld end connections of an expansion joint are equipped with pipe suitably beveled for welding to adjacent equipment or piping.

3. Assembly parts:
3.1 Internal sleeve:
Internal sleeve, inner sleeve, liner or baffles is a device which minimizes direct contact between the inner surface of the bellows of an expansion joint and the flowing medium.
Internal sleeve is usually made of stainless steel.
Advantages of internal sleeve:
Reduction of flow resistance.
Reduction of resonant vibrations in the bellows caused by flow velocities.
Abrasion caused by solid particles in the flowing medium.
Deposits of solid components in the bellows.

3.2 Tie rods:
Threaded tie rods or bars with nuts are devices attached to the expansion joint assembly whose function is to continuously restrain the full bellows internal pressure thrust during normal operation when permitting lateral movement that suits requirements.

3.3 Limit rods:
Threaded limit rods or bars with nuts are devices attached to the expansion joint assembly whose function is to restrict the bellows movement range, such as axial movement, lateral movement and angular deflection, during normal operation. In the event of a main anchor failure, limit rods are designed to prevent bellows over-extension or over-compression while restraining the full pressure loading and dynamic forces generated by anchor failure.

3.4 Reinforcing rings:
Reinforcing rings or equalizing rings are devices used on some expansion joints fitting smoothly in the roots of the convolutions of bellows. The purpose of these devices is to reinforce the bellows against internal pressure and accept movements of each bellows are evenly distributed.

3.5 Cover:
Cover, protective cover, protector or shroud is a device used to provide protection of the exterior surface of the bellows of an expansion joint from foreign objects, mechanical damage or dirt in the lower bends of the corrugation. A cover design is good for insulation over expansion joint.

4. Advantages of single expansion joint:
4.1 Simple way to absorb thermal movement on pipe-work as per the temperature variation.
4.2 Absorbs small amounts of lateral movement and angular movement.
4.3 Simplest construction.
4.4 The flow direction unchanged.
4.5 The efficient way to save installation space.
4.6 Most economical.
4.7 Minimum delivery time.

Keywords: Single expansion joint  Metallic Expansion Joints   

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Company Name CDI-Bellows
Country/Region Taiwan
Province / State Taiwan
City Kaohsiung County 831
Address No.84, Huadong Rd., Ta Fa Industrial District, Daliao Township
Telephone +886-7-7873488
Fax +886-7-7872755
Contact Person
Website http://www.expansionjointsupplier.com