Definition - What does Isolation Joint mean?
An isolation joint is a concrete or metal structure used to provide electrical or cathodic independence of a process vessel from fluids it is used to house or process.
The term isolation joint also applies to meeting points around in-pavement structures such as drainage inlets, manholes, footings and lighting structures. Isolation joints allow for anticipated differential horizontal and vertical movements between pavements and structures. Their purpose is to allow movement without damaging adjacent structures.
Corrosionpedia explains Isolation Joint
Isolation joints include full-depth, width structures with adjoining points found at bridges, intersections or pipelines.
Isolation joints provide leak proof, long lasting blocking mechanisms against the flow of electricity in piping systems. Reducing the flow of electricity reduces the occurrence of electrochemical cells that cause corrosion. Therefore, isolation joints are used to reduce the rate of corrosion.