AMERICAN Earthquake Joint System
AMERICAN Earthquake Joint System Flex-Ring

Product Description

The AMERICAN Earthquake Joint system combines the rugged, tough, and time proven deflection performance of AMERICAN’s Flex-Ring restrained joint pipe with the capacity to expand and contract.

The system is built around a central earthquake casting which features in its design an extended socket depth allowing the specially placed Flex-Ring weld ring an expansive range of motion.

The ductile iron earthquake casting and the Flex-Ring connecting piece arrive at the jobsite pre-assembled by our professional staff at our manufacturing plant. The extended socket bell receives a Flex-Ring spigot with a set-back weld ring. The pre-assembled Flex-Ring spigot has a double stripe, one showing full insertion and the other mid-point insertion. So that both assembly stripes are visible, the illustration above shows the joint installed in the fully extended position.

Pre-assembly means the on-site contractor only needs to assemble the familiar and conventional Flex-Ring joint. In this application, the Flex-Ring spigot on the central earthquake casting is red in color and machined instead of welded. Conventionally, it’s a Flex-Ring joint and is assembled in the field in the same manner.

The AMERICAN Earthquake joint may be assembled in the fully contracted position, allowing for maximum expansion; it may be assembled in the mid-point position, allowing for both joint expansion and contraction; or it may be assembled in the fully extended position, allowing for maximum joint contraction.

The more common position is the mid-point position, which allows for both expansion and contraction during a seismic event.

After assembly, the AMERICAN Earthquake Joint System can expand and contract longitudinally and deflect at each of the two joints. With five degrees of deflection from the conventional Flex-Ring joint and three degrees of deflection from the extended socket Flex-Ring joint, the assembly provides a total of eight degrees of deflection as well as 2.4 inches of expansion and contraction. If assembled in the fully contracted or fully extended position, 4.8 inches of one-way longitudinal differential is available.

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