Internal Boundary Conditions (Articulated Pipelines)

Internal boundary conditions

If the pipeline cannot be considered as a continuous beam, as in case of articulated pipelines, the connection type between the separate pipe sections has to be specified.

Examples of articulated pipelines are (nodular) cast iron, (reinforced) concrete, plastic (PE, PVC) and glazed stoneware pipelines provided with wether or not anchored socket-spigot connections.

Other applications are articulation joints at the transition to rigid (building) structures and expansion joints or compensators in hot pipelines.

Available joint types

Socket-spigot connections

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Non-tensile resistant type

Tensile resistant type

 

Sleeves

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Articulation joints

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Non-tensile resistant type

Tensile resistant type

The non-tensile resistant articulation joint is modelled by two socket-spigot joints and the tensile resistant articulation joint is modelled by two ball hinges at a distance B of each other.

 

Bellows

The bellows type of connection can be specified with stiffnesses in axial, transverse, torsional and rotational direction.

Examples:

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Bellows2

Expansion joint

Compensator

 

Direction of local X-axes for different types of joints

With Socket types the local X-axis is equal to the local X-axis of the adjacent element with the lower element number.

With Spigot types the local X-axis is equal to the local X-axis of the adjacent element with the higher element number.

For all other types (“Sleeve”, “Ball”, “Hinge”, “Tight” and “Bellows”) the local X-axis is perpendicular
to the bisector of the local X-axes of both adjacent elements.

JointsLocalXaxis


InternalBoundary, last changed: 14/09/2016

See also:

The pipeline configuration

The pipeline model

Pipe/soil interaction model

External supports and end points

Main analysis methods

Results

Quality assessment