Flow rate calculation

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  • Tim
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Hi I’m not very good at maths and need to work out the flow rate through a reactor.

I need around 2000lph, I’m doing it in a 2 litre jug.

There’s 3600 seconds in a hour so if I got a litre a second I would get a litre a second.

My brains fuddled and I can’t seem to grasp getting it from there to 2000lph.

Please help before my brain melts


Tim

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Reply #1

You've 2000 l per hour which you'd decide by 60 which works out 33.3333 l per minute , devided again by 60 gives 0.5 l per second . You've a 2l jug devide by 0.555 per second equals 3.6s to fill the jug .

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Gav

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Reply #2

I use a flow cup to measure mine , just run it off through the hole in the top into a pale to measure how far the water level comes up the slot with no's on during water change , this one will measure up to 1500 l per hour but you can get slightly bigger ones .

Asco1104

  • Tim
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Reply #3

Thanks Gav got it sorted now

We’re did you get the cup from?


Tim

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Reply #4

I use these at work for setting water flow rates on combi boilers , any plumbers merchant / wholesale should stock them , this ones by a company called Regin , or even Google plumbers flow cup , you'd check what the l per minute are (as some have different max litres per minute from others) then multiply by 60 to give you hours .

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Reply #5

I never knew those existed. Neat.

I guess it works based on the viscosity of water, but what about the difference with saltwater? Have you benchmarked it with fresh vs salty? I guess the different density might affect it?
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Reply #6

Hi Mike , I've never even thought about it , I'll need to give it a try when I do a water change next see if there's any difference between salty and fresh water flow rates through the cup . Be quite interesting to see .

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