Support Movement and Rotation

End and intermediate support displacement can only be input in the direction of the restraints, which the support places on the piping. Displacement is along  linear restraints, while rotation is along rotational restraints.

For more information, see load combination.

From Equipment Temperature Expansion in Operating State

Support displacement from equipment heating in operating mode is considered only in piping operation state. These displacements are multiplied by the appropriate averaging and stress relaxation factors in high-temperature piping analysis.

From Equipment Temperature Expansion in Test State

Support displacement from equipment heating in test state is considered only in piping test state.

From Other Influences (Support settlement etc.)

Support displacement from other forces is considered in all three states (operation, test and cold) and can model, for example, support subsidence. These displacements are not multiplied by averaging and stress relaxation factors in high-temperature piping analysis.  

For more information, see  load combination.

Fig. 1 shows an example of using support displacement to model column equipment thermal expansion effects on piping. For this model, support displacement must be input in node 2: along the Z axis with a value of Δ_2z=α(T_op-T_assembly)L₂, along the Y axis with a value of Δ_2y=α(T_op-T_assembly)*D/2; and nozzle displacement in node 4: along the Z axis with a value of Δ₄=α(T_op-T_assembly)L₄, where α - material linear expansion factor for equipment body, T_op - equipment temperature, T_assembly - equipment-piping system installation completion temperature, L_2,4 - length equal to the difference between the top restraint marker and equipment anchor marker.

Fig. 1. Taking into account column equipment thermal expansion effects on piping

Properties

Menu Access

Insert > Displacement > Move and Rotate Restraint