Backyard Aquaponics
A place to discuss aquaponics

Has anyone tried both of these pumps?

Does this graph look about right for the 1500 and 1300 models flow rates at different heights. I'm just guessing here.




If so would ould I be correct in thinking that at say 1.0m to 1.2 m height, (for an IBC system) the 1500 and 1350 would both pump about the same - around 1000lph?

I'm setting up an IBC system.

So if they both put out the same at the height of an IBC system, would I be correct in thinging I'd be better off with the 1350 because of the ability to put out a bit more pressure?

I also might want to try some vertical strawberry pots or some NFT, so the pressure could be handy.

Does anyone know this stuff?

and as a follow up question.

If I restrict a pump as its going into the growbed at 1 metre, and divert a trickle of water up to 1.5 metres, does that have a dramatic impact on the FLOW of the stuff at 1 metre?

if a pump puts out 1001 lph at 1m
and 1 lph at 2m
can I take the 1 litre of water at 2m and still get the 1000 flowing at 1m?

or could I perhaps get 100 ml at 2 m
and 1000 at 1m

?

confused

i understand what you're saying but can't really answer your question.. but applied something similar..
as you restrict the flow on the lower outlet, the flow on the upper outlet will increase, right now my "high point" is to my flushtanks, i have 2 swirl filters running off the same pump with valves to adjust.. if i open up the 2 filter valves too much, i don't get anything up to the high point..
so if you take "all" the flow lower, it won't pump as high,, you'll have the same amount of pressure at the low-point, however much you flow you remove..

I cant even tell if that's the answer I need

I'm struggling to even pose the question, so if you are following what I'm asking, you're doing really well
------------------

if the high point volume is 1*High-flow

or the low point volume is 1*Low-flow

Do I have only 1*(x)flow to divide between the two, regardless of which kind of "1" it is?

or can I take say .25*High-flow, and still get some figure like .99*Low-flow

ie if I pull say 1 lph of the possible High-flow flow do I only lose 1lph of Low-flow, or do I lose the percentage that that 1 litre of High-flow represents?

I think I need to invite some people to this thread

Lets see ... anyone on here related to that guy who slept with Nobel's wife?

HA!
to much maths for this old feller..

Hmmm it could just be me I just reread that and I'm not even sure if that means anything.

I woke up in the middle of a general anaesthetic an unremembered number of days ago (maybe 2) and I suspect they just shot my full of whatever was at hand, so who knows how many brain cells they killed

At least now I have an excuse if I ever put my shoes in the dishwasher

And...

At least now I have an excuse if I ever put my shoes in the dishwasher

But this is actually really frustrating. I cant frame the question that I need an answer to.

If anyone else is reading this and thinks they understand the question, can you try and make it clear.

Anyway, I'm hungry, so I have to go and get my shoes, I cant remember where I left them.

Hi Bullw, hope the brain surgery turns out ok. I put an extension peice on one outlet to see if my pump could get it up for a strawb tower and nothing come out . The rest of the system ran as usual. I think you would have to restrict every outlet to force it up to the level required or get a dedicated pump.

I had brain surgery? My shoes didn't mention that.

I think if I have a pump that can pump 1 drop/hour @ 2m, and I pull that 1 drop, that wont have a large impact on the flow at 1m... but then the pressure required to push that 1 drop must be the same as required to push all that flow at 1m. So if I take the drop does that mean I lose the flow at 1m.

need more heads

Can anyone reading this invite anyone who might know this stuff to have a look

If you think either one of those pumps will do the job for you, rather than doing your head in with the maths trying to figure it out to the last litre... buy the next size up, or even one twice the size of what you think you'll need... and by-pass the extra flow/pressure back to your FT/ST for aeration/circulation.

This way, if your calc's weren't correct, or you expand your system in the future... you'll have the extra flow/pressure required.

I'm not sure that either of those pumps would be sufficient to turn over a the volume in a Chift Pist system... even at 0.5mtr head....

If you want to pump to strawberry towers... then get a pump that will pump to the head measured to the top of the towers... the rest will just flow...

Yeah I'd go for a 3000L....

Oh really? mmm

ok thanks .

I was hoping to get away with the low wattage ones for some future wind power project on my blog.

I hate rethinking. Thinking is hard enough as it is.

BLOODY HELL how did you guys follow all of that and come up with what Q Bullw was asking and what A to give him

Must admit I was confused by "I had brain surgery? My shoes didn't mention that."
And really I didn't get a lot of it I just know that those small pumps are only good for very small systems and their max head isn't so great....

Basically your restriction has to create a pressure loss equal to the pressure needed to pump to the higher height. So your total flow will be equal to the flow as if was all going to the higher height even though most will be delivered to the lower height.

In terms of choice of pump I believe that the 1.2m working point was chosen beause an ibc is about 1.2m. If that is the case and you want to maximise flow go for the one that drops off slower because your total dynamic head will be more 1.2m because of friction losses in your pipes. Depending on your pipe network this could be a small amount or a large amount but even if small it will still be significant. Just look at the effect of an extra .2m of head due friction losses.