The tubing portion is pretty easy to explain. It acts very much like a spring in a mechanical system. It will stretch (dilate) when a pressure gets applied. This stretch is very minor, but represents some finite change in system volume. The storage energy is simply delta-P (running versus stopped) times the system volume. It's not so easy to calculate, but is completely immaterial. Once you reach steady-state, stored energy has no bearing on the matter.
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