Insulating joint Couplings (ItC) are widely used in the oil industry to electrically isolate parts of pipelines which are subjected to cathodic protection. Mechanical failure of the IJC's are predominantly due to excessive rotation of various flanges used to make up the couplings. This paper uses Timoshenko's general theory of flanges and deflection of beams on elastic foundation to develop an analytical model for displacement of the flanges which are essential in the design of these Couplings. The results are validated numerically using the finite element analysis method and experimentally by measuring IJC's flange rotation.
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