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Primary loads are sustained, non-self-limiting forces. Sustained loading means the force continuously acts on the system regardless of deformation.

Completely isolates a piping segment; protects sensitive equipment nozzles. Free (or resting) Lateral Restraint

is the ability of a piping system to deform elastically under thermal expansion without developing excessive forces. The natural bends, offsets, and changes in direction that are already required to route a line from point A to point B provide some inherent flexibility. If that inherent flexibility is insufficient, additional flexibility must be added by introducing expansion loops, expansion joints, or by adjusting support locations.

Fluor’s training often concludes Lesson 1 with practical heuristics designers should apply before sending the model to the Stress Engineer: