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To get the max. flow at no resistance, you have to compensate the resistance of the measuring facility itself. Also you have to use a second pump in the system to neutralise the system resistances. If you work accordant to this process, you will measure also the 570l/h, as we did it.
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Confusing to
you guys? Imagine on this end
Still education opportunity to try to think it through - Pardon the 'stream of consciousness' below
1> Sounds crazy to measure one pump using two - Thinking - No, makes some sense as pump mfg has to provide method to client engineers to replicate data transparent to individual bench setup (fittings, tube friction, etc.)
2> Implies an absence of a valid engineering standard for replicatable flow measurement? What is the equivalent to IEEE for pump engineers? Is there not an international standard for this type of measurement?