Double Expansion Joint

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Double

This consists of two single joints joined by a common connector which is anchored to a rigid part of the structure by means of an anchor support base.  Badger Double Expansion Joints are supplied with or without an anchor support base depending on the customer’s preference.

A double joint is used where the axial movement to be absorbed is too large to be handled by a single joint.  The intermediate anchor on the center nipple divides this movement so that each bellows of the double joint absorbs its share of the movement.  Double joints are usually located in the center of a pipe run so both ends are subjected to the same movements and have the same number of corrugations.

This figure typifies good practice in the use of a double expansion joint to absorb axial pipeline expansion.  The intermediate anchor is conjunction with the two main anchors divides the pipeline into individual expanding sections so that there is only one expansion joint between any two anchors.