Finalizing my fish shed, and starting to work out pipework. Does your Excel document include gravity's effect on angled pipework....not just vertical? if not, do you have any equations/formula's which can help give me at least a rough picture of flow rates/distances/friction losses etc, any help would be most appreciated.
Does anyone know if I can use the figures in this thread to size my DIY overflow box? I assume the horizontal flow numbers are the most applicable, since it won't have the height to achieve the vertical flow numbers.
I did some quick calculations and it looks like the flow rate is fairly consistent - around 7.96 gallons per minute per square inch of cross-sectional area. I'm using a Quiet One 5000 at around 5 feet of head, which should output about 900GPH. I'm not sure how much extra flow I should allow for. Would 25% be enough? That would require an overflow box capable of 1125GPH or 18.75GPM.
If everything else is right, that would mean I would only need 2.36 square inches of cross-sectional area in my overflow box. That doesn't sound like much. Is there any detriment to building the oveflow box far larger than it needs to be?
Just wanted to come in here and say thank you to chompers and all who gave good info in this thread just put together my overflow and the numbers are accurate, I went with 1.25" pvc pipe and bought a 1000 gph pump which was adjustable for flow just in case. But she is wide open and working great thank you all I built my first diy filter.