How to Choose an Expansion Joint

Release time:

2021-04-14

For example, in a high-pressure piping system, if the bend system is designed without constraints, Expansion joint The piping system, under the influence of pressure and thrust, will experience significant deflection deformation, leading to excessive deformation and failure of the bellows.

How to Choose an Expansion Joint

In pipeline systems with stringent pressure-drop requirements, artificially increasing... The π-bend, compensated by a three-hinged design, results in excessive pressure drop. If a single-hinged expansion joint is used for compensation, the actual compensation effect cannot be achieved. At the initial stage of website design, while designing the pipeline network and support system, it is also essential to consider the selection and configuration of expansion joints, ensuring that the pipeline network design is reasonable, reliable, and cost-effective.

When the pipeline is ready for use Expansion joint When accounting for thermal expansion, the positions of fixed pipe supports should be determined first. By installing fixed pipe supports, any complex piping system can be divided into independent expansion sections with simple geometries. ( Such as straight pipe sections, L Shape pipe section, Z Shape tube section ) Then proceed with compensation design.

The primary factors to consider when determining the number and location of fixed pipe supports are: : The direction of the piping system, one or a group of them Expansion joint The amount of thermal expansion absorbed, the locations suitable for installing fixed pipe supports, and the positions of equipment connected to them.

Since bellows and expansion joints have poor ability to transmit and absorb torque, when setting up fixed pipe supports and arranging expansion joints, one should尽量 avoid having more than two planar sections composed of independent pipe segments, in order to prevent torsional loads from acting on them. Expansion joint Up.

When calculating the compensation required for pipe sections, all possible temperature sources must be taken into account. Typically, the temperature of the working medium is the primary source of thermal expansion; however, in certain cases, the ambient temperature outside the piping system can also contribute to thermal displacement. Moreover, in some instances, mechanical displacements—such as pipe deformation caused by stress, foundation settlement, installation errors, equipment vibration, and wind loads—cannot be ignored either.

Generally, each individual expansion joint section may have multiple compensation options. For example, a long straight pipe section can opt for an external-tooth axial expansion joint. ( Reduce the number of intermediate fixed supports. ) Alternatively, they can opt for three-hinge compensation by adding a π-bend; or they can add an intermediate fixed support and use multiple single-axis supports. Expansion joint Perform compensation. The overall cost, space constraints, and requirements for stress and fatigue life should be considered comprehensively. After comparing various options, the locations of fixed pipe supports and the types of expansion joints should be determined.

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