If you have a settlement issue to contend with here are my suggested solutions and the order of preferred remediation...

1)Common foundation for pump, supports and tank.

2)Spring cans and added piping flexibility (offsets, loops etc.).

3)Expansion Joint...

Expansion Joints should usually be selected as last choice, they are very good when all goes well between design, installation, and operation... but when they are bad they are very bad.

If you have a joint attached to a tank nozzle with no shutoff valve and it fails you would de-inventory the entire tank.