To everyone:
The reason that running centrifugal pumps in series is preferable for reliability purposes is that if one goes out, the other is there to pick up the slack.
If you are running directly parallel, the parallel loop the other ran in will become a bypass, and most of the flow will backfeed through the dead pump's loop, following the path of least resistance. You'll end up with burnt components every time unless you put in elaborate back-pressure valves to prevent it, but that involves more hassle than it is worth considering that it is easier to just put in one higher-rated pump.
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