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Thread: Max flow through pipe
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25-04-2021, 10:22 PM #1
Max flow through pipe
I’ve been reading about max flow based on pipe size and limitations etc.
I read somewhere that the limit on 2 inch pipe is way lower than 30,000lph
So why has evo sold me a pump with 2 inch inlet and outlets with a claimed 30,000 lph capacity?
Can 30,000 lph actually be achieved with this pump?
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25-04-2021, 11:47 PM #2
Flowrate is relative to pressure. At 20 bar you'd get a lot more than 30,000lph from a 2" pipe
For koi pond pumps 30,000 lph is a theoretical output on a pump curve graph at 0 mtrs head height.
ie no pipework attached.
At a 2 meter vertical height with no bends most 30,000 lph pumps output about 20,000 lph.
Stick a few 90 bends on as well and your at way less than 20,000lph acutal....Last edited by davethefish1; 26-04-2021 at 12:34 AM.
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26-04-2021, 02:10 AM #3
it’s only 2” at the pump, you can step straight up to 3 or even 4” for your feed/return this helps to avoid any flow reduction caused by bends/t’s etc
UV’s are very similar, even the smaller EA versions state a flow rate of 20.000lph but that’s based on a straight run of pipe in and out which obviously, is nigh on impossible to achieve so most will go with a larger diameter pipe either side to counter act any restriction caused by deviations in the pipe run.
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26-04-2021, 11:08 AM #4
When Koi Carp magazine was around I wrote a long series of articles that covered and explained in simple language every aspect of koi ponds and the equipment we use. Part 9 covered pumps and obviously included flow rates. It explained how a manufacturer tested to specify the maximum flow rate of a pump and what that would mean when the pump was used in a practical situation.
Part 9 is on the first link and, for anyone who is interested, the start of the series is on the second:
Good water guide; pt 9 (mankysanke.co.uk)
Good water guide; pt 1 (mankysanke.co.uk)
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26-04-2021, 06:43 PM #5
Ok great thanks guys
So I’ll go with two 30,000 lph variflows and if they are too fast dial them down...
If they aren’t strong enough well I’ll have to rip out my 2 inch pipe and replace it all with 3 inch
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