13 - Epoxy Chocking
Review articleOpen access

Publisher SummaryEpoxy resins were developed in the mid 1930s, but their use by the industry did not become commonplace until around 1955. The marine industry was the first to use epoxy resin chock to set reciprocating machinery. Despite the widespread acceptance of epoxy chocks in the marine and the pipeline industries, relatively few engineers fully understand the principles of epoxy resin chocking. Most engineers assume that iron or steel, being stronger, must be a more suitable chocking material than the epoxy resin chock. It makes sense that a high compressive strength material like steel is certainly not a disadvantage in a machinery support system. However, an unnecessarily high one may be accompanied by other undesirable properties that present a distinct disadvantage. Epoxy chocks work best in conjunction with the proper clamping force of the anchor bolts to maintain the vertical alignment and to prevent horizontal movement of the engine. The coefficient of friction of an epoxy chock is about three times higher than the coefficient of friction of a steel chock. After dimensional stability, the most important factor in chocking is the available frictional force, so resin chocks have an obvious superiority. A properly designed epoxy chock, with its high coefficient of friction and correct fit, coupled with sufficient anchor bolt clamping force result in a dynamically stable system.

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