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Glossary of Terms

Glossary of Terms_Flexible Metal Hose

 Sizes Glossary of Terms - Flexible Metal Hose Manufacturer | Hengshui Ruiming
Angular rotation: flexion around the longitudinal centerline of the expansion joint.
Axial extension: Extension of bellows length due to pipe contraction when piping system is properly anchored.
Axial compression: Compression of the bellows length due to expansion of the piping when the piping system is properly anchored.
Bellows: The flexible element of an expansion joint consisting of one or more rebates.
Expansion Joint Bellows: Any device containing one or more bellows used to absorb direction changes, such as those caused by the expansion or thermal contraction of a pipe, conduit, or container.
Concurrent movement: simultaneous axial, lateral and angular movement.
Control bar: Devices connected to the expansion board with the function of distributing the movement between the two bellows of a universal joint.
Convolution or corrugation: the smallest flexible unit in the bellows. The total movement of a bellow is proportional to the number of rebates.
Cycle: A cycle is a full motion from the starting position to the operating position and vice versa.
Life cycle: Also known as fatigue life expectancy, which is affected by several factors including (but more limited to): service pressure, operating temperature, bellows materials and bellows design or profile. The change to any of these factors changes the life cycle.
Directional Anchor: A directional or sliding anchor anchor is designed to absorb loads in one direction while allowing movement in another. It can be a primary or intermediate anchorage, depending on the application considered. When designing a directional anchor, an effort must be made to minimize friction between moving or sliding parts, as it will reduce the load on the piping and equipment, and ensure proper operation of the anchor.
Outer cover: Expansion joints require careful handling; They must be protected from any impact, solder splashes, etc. Before installing an expansion joint, care should be taken to prevent any foreign material from being found in the convolutions. It is appropriate to install a metal cover on the flanges to protect the convolutions and then cover with insulating material.
Flow liner: It is installed in the inlet hole of the expansion joint to protect the bellows from erosion damage due to abrasive media or resonant vibration by turbulent flow and excessive velocities. An arrow should be placed indicating the direction of flow on the outside of the expansion joint.
Intermediate Anchor: A device that divides a pipe into individual expansion sections that contain multiple expansion devices of the same pipe size. This anchor must be designed to withstand the forces and movements imposed by each section of the pipeline to which it is attached. In the case of a pipe section containing one or more bellows units, these forces will consist of forces and/or moments necessary to deflect the bellows unit plus the frictional forces due to the pipe moving over its guides. The thrust pressure is assimilated by other anchors or bellows unit devices such as limiting bars, tie rods, limiting hinges, etc.
Lateral displacement: movement that is perpendicular to the plane of the pipe and parallel to the remaining accessories of the expansion joint.
Limiting bar: Devices with the main function of restricting the range of motion of the bellows. They are designed to prevent over-extension or over-compression of the bellows and at the same time restrict the total thrust pressure in case of failure of the main anchor.
Primary anchor: A primary anchor is installed in any of the following locations on a piping system containing one or more bellows:
In the direction of flow change
Between two bellows units of different sizes and installed in the same straight section
At the entrance of a lateral branch of the main line
When a pressure reducing valve is installed on a pipe segment between two bellows units on the clogged end of the pipe.
A primary anchor must be designed to withstand the forces and times imposed by each of the pipe sections it is attached to. In the case of a pipe section containing an unrestricted bellows, these will consist of the thrust pressure, the force required to deflect the bellows unit and the frictional force due to the movement of the pipe over its guides.
Pipe Alignment Guide: It is a form of sleeve fixed to a rigid part of the installation, which allows the pipe to move freely in a single direction, ie

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