Variations in Configurations

Mismatched and Overseas Flanges

Expansion joints can be used as flange transition pieces. For example, a pump may have an ASA 300 flange, but the system continues with ASA 150 piping. The expansion joint is built with an ASA 300 one end, ASA 150 the other, so there is no need for another transition fitting. Sometimes it is a European to an American standard where there might be a DIN 10 on one end and ASA 150 the other. We build expansion joints to match any Overseas flange system such as the Japanese JIS, the British PIN, the European DN, etc.

Offset Joints & Unparallel Faces

When retrofit work is in progress, we are often called on to provide expansion joints that match the piping system after years of settlement and shifting. When the expansion joints are built to fit conditions rather than forced into position, all normal movement capabilities are retained.
The illustrations show offset expansion joints and joints with unparallel
faces as manufactured to meet these conditions.

Longer & Shorter Joints

While we have a whole series of standard face to face dimensions, the rubber expansion joint industry is so old that we often replace joints that were never built to any standard. Thus we build joints that are longer or shorter to avoid repiping.

Movements

Rubber expansion joints are capable of axial compression, axial expansion, transverse and angular movements. In many cases, three movements are all taking place at one time. Standard expansion joints have movement limits, but they can be increased by changing to multiple arches or single piece construction with an arch at each end and a long intermediate hose body.