Cathar
now you know what I think about the cavorting on OCAU while I’m trying to catch a bit of sleep
sorry (not really) about messing up 'your' thread
pHaestus
"Understanding that the curves (resistance vs. flow rate) for all the components are interactive is also key I think."
well, not really
(a shame Dave gave up in disgust, I am presuming - as a major contributor)
this was generated as part of calibrating the flow bench:
(these are wb connectors/ID restrictions)
the value shown is for a single reduction from 0.625in. ID
if there were 2 such in line the pressure drop would be doubled
if the flow rate was held constant
- but this is NOT the 'normal' pump setup, eh
as 'pipers' deal with flow resistance, everything is translated into 'equivalent lengths' (of straight pipe of the same type and size as the system or branch) and the head loss calcs are run then on the total system 'footage'
no interaction, simply additive resistances
see Crane
EDIT: this is an old graph and is innaccurate in an absolute sense for several reasons,
none of which affect its use to illustrate the above example