Design and applications of expansion joints

     Design and application an Expansion Joint, engineers must consider various factors that may affect the Expansion Joint as follows

  1. Media

The fluid passed expansion joint has 3 principal states : liquid, solid and gas.

Choosing the right material to affect performance and service  life.

  1. Ambient

Expansion joints should be installed in a favorable condition, ventilated area, outer temperature not high and should not be area with chemical corrosion.

  1. Tightening the nuts and maintaining an appropriate distance.

For efficiency to use. Users should know the specification for selecting bolt and nut types, width and thickness Clamping bar to be correct.

  1. Dust Loading and Velocity

Dust loading and velocity of dust to friction with the expansion joint can affect its service life, including sedimentation and arrest dust, which are also issues.

  1. Finite element analysis

This process helps to analyze and design expansion joints, predict damage caused by heat transfer and mechanical forces and vibration.

  1. Leakage

Expansion joint is designed so that there is no leakage of the medium (chemicals, steam, water, gas) from the inside to the outside.

  1. Moisture Content and Condensation

Moisture, content and condensation in line pipe all of them affect the service life expansion joint.  

  1. Movement

Expansion joint designed to support movement and Lateral movement of line pipe or flange and support vibration. Movement pattern expansion joint is as follows.

              7.1 Axial Extension Movement

              7.2 Axial Compression movement

              7.3 Lateral movement

              7.4 Angular movement

              7.5 Torsional Movment

              7.6 Vibration

  1. Noise

Adding a layer of insulation to the Expansion Joint reduces the noise generated in the system. Designers must have an understanding of selecting appropriate materials.

  1. Pressure

Pressure is considered an important variable. This will affect the choice of type and size of Expansion Joint. The design must therefore calculate the maximum pressure that the Expansion Joint can support.

  1. Tempurature

The design temperature that users must consider is as follows

10.1 Normal operating temperature

10.2 Maximum operating temperature

10.3 Thermal Cycling