4400 and 6600 bellows expansion joints ready for shipmemt

Our order for the 4400 and 6600 bellows expansion joints ready for shipmemt,Foro bellows supply the high quality bellows expansion joints,please feel free contact us at sales@forobellows.com

Here is some introduction about the 4400 bellows expansion joints 

Working Principle:

The 4400 expansion joint relies primarily on the flexibility of its bellows to absorb thermal displacement (axial, lateral, and angular) of the pipeline.

However, it cannot independently resist the blind flange forces generated by internal pressure.

This significant blind flange force must be borne by the piping system itself, specifically by the primary anchors.

Pipeline System Requirements:

Main anchors are required: Piping designers must design sturdy primary anchors on both sides of the expansion joint or at appropriate locations. These anchors must be anchored to the civil structure and must be strong enough to withstand the blind flange forces and other piping forces.

Guide supports are required: Guide supports are required to prevent the pipeline from buckling when the expansion joint deforms.

Application scenario: 

Suitable for situations where the pipeline route is simple and a strong fixed bracket can be easily set up.

6600 bellows expansion joints introduction:

Working Principle:

The 6600 expansion joint integrates hinge plates, pins, and tie rods into a single, integral, load-bearing structure.

This rigid structure transmits blind plate forces directly from one end of the expansion joint to the other, creating a self-balancing system.

Therefore, blind plate forces are not transmitted to equipment or primary anchors at either end of the pipe.

Pipeline System Requirements:

No primary anchors are required to support blind plate forces: The anchors at each end of the pipe only bear the weight of the pipe and frictional resistance, significantly reducing the burden on the anchors.

Motion Limitations: Hinge-type expansion joints can typically only absorb angular displacement within a single plane. To accommodate multi-directional displacement, two or three hinged joints must be combined into a "hinge group."

Application scenarios: 

Widely used in situations where large displacements need to be absorbed and a strong main fixed support cannot be set, such as the outlet of large boilers, the inlet and outlet of gas turbines, and large pipelines in petrochemical plants.