This expansion joint is simply a bellows element with end connections.
Regardless of accessories,such as liners and covers,it wil deflect in any direction or plane that the bellow will. It is the least expensive type,but requires that the piping be controlled as to the direction of the movements required of the unit. The expansion joint should not be expected to control the movement of the pipe. If the piping analysis shows that the expansion joint must accept axial compression,then the piping must be guided and constrained so that only that movement will occur.?
This expansion joint will not resist ant deflections with any force other than the resistance of the bellows,which is a function of the spring rate times the deflection amuont. It is incapable of resisting the pressure thrust along its axis,which is the product of the pressure times the effective,or cross sectional,area of the bellows. Large diameter units,even with low pressures,can generate very large axial pressure thrust forces,which must be reacted by main and directional anchors. Otherwise the expansion joint will extend with disastrous results.
Tied Single Bellows Assemblies add tied rods to a Single Bellows Assembly to increase design flexibility in a piping system. The tie rods are attached to the pipe or flange with lugs that carry the pressure thrust of the system,eliminating the need for