BOA - Expansion Joints - Brochure

According to their physical properties, most metals expand with increasing temperatures and contract with decreasing temperatures. In pipeline systems, this phenomenon causes a variation in the length of the individual sections of the pipeline. As pipelines are normally anchored at least on two connection points, any variation in length will result in thermal strain in the material and enhanced forces and moments at these terminal points. As far as possible, one will utilize the inherent flexibility of a pipeline to compensate for the pipe expansion (natural compensation). Should the expansion, however, exceed the inherent flexibility of the pipe, expansion joints are necessary to compensate these movements.