Understanding what a tie rod does versus what a limit rod does is essential when specifying expansion joints for industrial piping systems. The function of a tie rod on an expansion joint is to continuously restrain full pressure thrust during normal operation while permitting lateral deflection only. This distinction becomes especially important when evaluating tie rod configurations in complex piping assemblies.
Limit rods, by contrast, are designed to limit axial expansion or compression of an expansion joint and absorb pressure thrust specifically in the event of anchor failure. Selecting the correct component ensures long-term system integrity and safe operation.
The function of tie rods on an expansion joint is to continuously restrain the full pressure thrust during normal operation while permitting only lateral deflection. Limit rods are used to limit axial expansion or compression. Limit rods are designed to absorb the pressure thrust of the expansion joint in case of anchor failure.