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Bellow Expansion Joints, Rectangular
Bellow Expansion Joints, Rectangular
Flexican rectangular bellow expansion joints are used for various applications in steel plants, power plants, chemical plants, petrochemical complexes, refineries, etc. These are custom made due to wide range of basic requirements of pressure, temperature and the duct sizes. Features: available in single-ply only; single-ply walls in the straight area improve the strength; absorbs axial, lateral and angular movements; eliminates main anchors; available in different types of corners like single mitre, double mitre, round corner, camera corner, and oval shape; minimum guiding required; absorbs displacement due to thermal expansion; and balance pressure thrust remains constant. These metal bellows, like circular expansion joints, absorb three types of movement: axial, lateral and angular. For designing it is critical to know the direction of lateral and angular movements will occur, e.g., parallel to the long and/or short side of the bellows. Because rectangular bellows are usually of large size lateral deflection in single bellows is often impossible. The better design option is universal type where two bellows elements connected with a centre duct. Rectangular bellows are designed for longitudinal bending stresses. Long unsupported lengths must frequently be supported to prevent excessive deflection and stresses of the bellows element. In certain applications, covers and liners can perform the function of pressure supports.