to the point: the Daden res will not have issues since it is probably has a safety factor of 1000 like everything else they make:
:
read on if needed... the most interesting thing about gases is they increase in either pressure or volume as temperature increases. we all have seen the perfect gas law from high-school chem (i hope):
P*V=n*R*T
you need to ignore the water volume & consider only the gas volume because your teacher said so a while back
. expansion "P" changes can be greater than "column pressure" (water weight) at the bottom if enough air is sealed in the system. i would also consider the resistance of the system from inlet to outlet of the pump, the inlet has reduced pressure & the outlet has elevated pressure. the pressure drops mostly when it passes through waterblocks, so the pump outlet line sees the most pressure. restrictions along with large air volumes would dictate the pressure safety factor required for a cooling system's tubing, clamps, etc...