METALLIC EXPANSION JOINTS

Pressure ranges up to 25 kg/cm2 & above two bellows elements are joined together by a center tube and fitted with either pipe ends or flanges. The assembly is capable of both axial and lateral movements but is limited to low pressure applications because of center tube instability.

A double expansion joint consists of two bellows joined by a common connector which is anchored to some rigid part on the installation by means of an anchor base. The anchor base may be attached to the common connector either at installation or at time of manufacture. Each bellows acts as a single expansion joint and absorbs the movement of the pipe section in which it is installed, independently of the other bellows. Double expansion joints should not be confused with universal expansion joints.

Single Expansion Bellow * Most economical expansion joints. * Total installed system cost may be higher than Gimbal, Hinge or Tied Expansion Joint Systems.

This expansion joint is a powerful solution to a difficult design problem, when axial deflections exist, and anchoring is impractical for structural or economic reasons, such as high in the air or short straight pipe runs between two large vessels. The principle of this type of unit is essentially the same as the pressure balanced elbow type, in that the axial pressure thrust is reacted by the pressure acting on a cross-sectional area equal to the area of the working or primary bellows. Since this unit is entirely axial, and there are no directional changes in the pipe, the cross-secti