Mabuhay!
The more springs are to be added/used in the piping system, the more it became unstable against wind, seismic and other external load. Thus, it is preferable not to use springs/hangers as much as possile.
Here are some tips when to use springs/hangers.
a. When piping system lifts up due to thermal in W+P+T and Y-stop supports or equipment nozzle couldn't support large piping weight. Even if the piping system lifts up in load case W+P+T, spring need not be used unless calculated stress exceeds allowable stress in load case W+P
b. When the rigid support can't deal with the large movement of piping near equipment nozzle.
In short, if you have a large displacement and large force that couldn't be dealt with rigid type of supports, think of springs/hangers as an option but not yet as solution,... because there might be another way to solve your problem without using a costly spring/hanger.
Stress analysis? read, ask, understand and apply.
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dark,
as always