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Post by Deleted on Apr 17, 2017 11:31:50 GMT
Hi Shamma Just looking at your diagram and wondering if the venturi is there to create negative pressure at the top of the pipe as air blows across it. If that's the case it may well draw the water up from the main tank and start a syphon to create a continuous flow. Just a theory. That is exactly what i wanted it to do, water to flow out from the bottom outlet pipe and mix with the air coming in from the venturi thus creating a continuous flow and aerating the water in the tank. I have thought about trying to syphon it but from what i have been told, where the water comes out has to be lower than the outlet to work. I have even tryed using a collaspable 5ltr water camping container to try and suck the water in the pipe to get a flow going but couldnt get a decent enough seal from the container to the top pipe. |
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Post by Deleted on Apr 17, 2017 11:40:38 GMT
I've had a look at those hydrolic pumps and now understand how the work, The weight of water from the scourse compresses air in the vessel, then through a system of check valves the same pressure is shocking some of the water uphill, the drawback is you lose 10% of the water causing the shock motion, ( you never get owt for nowt), I've looked at setting a syhon action up, but without a steady income of water into a header, its a non starter, A practical solution is a solar powered pump sink this to the bottom of the tank, extend the spray head to above the water and it will circulate the water, I think, Its only £15 so worth a shot, I have a little one i paid £7 for 2 years ago it works ok, I also had a look at those pumps and they are are great idea for taking water from a stream or other source, but like you said you do lose a lot of water and with it being on an allotment i dont fancy the idea of flooding all the ground with the excess that you lose. I also looked at solar powered pumps or aeration stones and for the cost of it, this is probably my best option as that is all i wanted the venturi system to do anyway. But thank you and everbody else who has replied, much appreciated.  |
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Post by jcplumb on Apr 18, 2017 0:26:08 GMT
If I get this, you're wanting something like capillary action in the bit you're calling a venturi to pull the water up over the normal level without any mechanical help so that it will continually circulate and not stagnate, cracking idea but completely impossible. If you manage it then before you tell anyone else how you did it, you had better patent it mate, you'll never have to work again, you'll have cracked the energy crisis  It doesn't matter where you put the pipework, it's atmospheric pressure not the weight of the water that dictates the water level in all parts of your system. You will absolutely need a pump, as Tom mentioned, there are some pretty cheap solar pumps but they're designed for garden water features so the flow will be weak and obviously will only run while the sun's up. Never heard of a ram pump so had a google of it, that's proper clever stuff, have you seen ram pumps used anywhere PB ? |
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Post by Deleted on Apr 18, 2017 0:53:22 GMT
If I get this, you're wanting something like capillary action in the bit you're calling a venturi to pull the water up over the normal level without any mechanical help so that it will continually circulate and not stagnate, cracking idea but completely impossible. If you manage it then before you tell anyone else how you did it, you had better patent it mate, you'll never have to work again, you'll have cracked the energy crisis It doesn't matter where you put the pipework, it's atmospheric pressure not the weight of the water that dictates the water level in all parts of your system. You will absolutely need a pump, as Tom mentioned, there are some pretty cheap solar pumps but they're designed for garden water features so the flow will be weak and obviously will only run while the sun's up. Never heard of a ram pump so had a google of it, that's proper clever stuff, have you seen ram pumps used anywhere PB ? Yeah thats exactly the idea mate, i have got an idea that might work without using any kid of pump, but we will see. And no i had never heard of a ram pump before so had to look it up myself, but im gonna give this idea ago, and you never know lol. Thanks for advice anyawy |
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