Kumusta & Mabuhay!

For rotating equipments where alignment is necessary (i.e. end-suction pumps), we usually use adjustable base support. We can use rigid or spring can support whichever is necessary to minimize force and moment loads.

Though for use of spring can on two parallel pumps where one is standby and one is operational, take note that during pump shut-down the pipe does not have fluid weight, the spring load design in this case would tend to push the pipe upwards creating vertical forces and bending moments. This case should be considered on your analysis.

For expansion joints, yes this is acceptable. But, carefull consideration of thrust load should be observed. A tie-rod is the most common that can allow a limited lateral movements depending on the design, but this wont help your axial loads. If you want to minimize your axial load, dont put tie-rods, instead put an anchor support downstream of the EJ, and dont forget to give the load to your civil/structural group on the anchor support, and inform the pump vendor.

Goodluck!