Accordion Joints (Tanesh)
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Application: Accordion joints are applied in Ducting, Piping in various industries in order to connect different sizes.

In systems that transfer fluids, the piping experiences movements which are caused by temperature difference from the fluid or the environment, device vibrations (such as pump or compressor vibration) or also caused by external movements such as wind, earthquake, ground sinking, etc.
Flexible joints are used to control these excessive movements and to prevent the transfer to the devices in the pipeline. Temperature and heat tolerance alongside axial, side and angle movements are characteristics of Accordion joints which makes them compatible with numerous industries such as water, oil, gas, petrochemical, power plants, steel producers, steel ducting, air ventilation systems etc.

The following items are some of the application for these joints:

• Air ventilations and heating systems
• Steam Plants (water electric power and nuclear power)
• Oil and Gas refineries
• Steel Industry
• Cement Industry
• Heat exchangers
• Wood and paper industry
• Heat Motors’ Exhaust systems


Various Parts of Accordion Joints

1. Bellows: The flexible part in an accordion joint which can move in any directed direction.
2. Pipe: The flexible part in an accordion joint which can move in any directed direction.
3. Collar: In joints with flanges, the collar joins the flange to the bellows and in welded joints, the collar directly connect the joint to the pipeline.
4. Flange: It connects the accordion joint to the opposite flange in the pipeline.
5. Internal Cover: It prevents the internal vibrations of the fluid in order to have a slow movement. If the fluid moves at a high speed and there’s no internal cover, turbulence occurs and it causes loud noises, drop of pressure, trituration and increase of temperature.
6. Cover Base: It is a stand for the cover and holds it in place.
7. External Cover: It is used to keep the bellow safe from any harm caused by external elements and also prevents the splashing of fluid in case of bellows failure.
8. Tie Rod Base: It holds the tie rod in place.
9. Tie rod: It withstands the pressure thrust in lateral moving joints and limits the excess movement of the joint according to design condition in axial moving joints.
10. Equalizing ring: In case of increase in pressure it reinforces the bellows and it’s also used to reinforce and control the heat of the convulsions.
11. Ring base: It holds the end rings.
12. Hinge base: It holds hinged plates in hinge and gimbal joints.
13. Hinge: It lets the joint movement just in angular direction and in single planes. It must withstand the pressure thrust.
14. Plate: It is a surface on which gimbal parts are pined upon.
15. Pine: It is the connecting point of gimbal and hinge devices.