Could it really work?

[RELICDUDE07]

This is what got me started on all this & the thought of gold....It just needs to be bigger

 

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[werleibr]

This video is long, but if you skim it you will see how air can indeed pump water. Now granted it is not a continuous stream of water, but it can get the job done. Worth testing with your current system at home.

 

[RELICDUDE07]

Very cool!Thanks---found this also between the v-pump idea & this i think i can come up with something light & cheap. I will be in the woods with no power around so it must run off gas - or 12 volt.

 

[werleibr]

Very cool!Thanks---found this also between the v-pump idea & this i think i can come up with something light & cheap. I will be in the woods with no power around so it must run off gas - or 12 volt. http://www.youtube.com/watch?feature=fvwp&NR=1&v=qDVYIT85ntg

Understandable, Did not know if you would be utilizing a generator or not. Good luck with making everything.

 

[RELICDUDE07]

This is my kit for the poor mans dredge....The Vpump installed inside a 3 inch pvc, a few inches up from the bottom .... A 50ft garden hose you cut in 1/2 -1 side 25ft. go's from the bilge pump to the inflow on Vpump -the gpm from a cheap 500 gph pump is the same if not a little more than a home garden hose bib most are around 300 gph ,the other 25ft of cut hose out to the sluice box - they feed in the t handle ends....1 side inflow /1 out flow ....The T handle is to push the pipe up & down in the mud /sand...Do not glue these parts ,as you can add more length of pipe if needed for deeper water to skim the bottom .... Vpump has lift up to 40ft - this was info from testing on Vpump web site. Vpump is $19.95 -bilge pump$12.95 use your car battery if ya like ....That gives ya $18 dollars for a garden hose & pvc pipe ....Total $50.00............. Opps !Use this fitting for the T so the garden hose doesn't kink .......

 

[Jason in Enid]

You are overlooking one thing in all those videos. That device was made to be used with a typical city water supply pressure which is around 70 psi. A bilge pump can only push a few psi. When it hit the venturi restriction on the V-pump, it's going to crap out.

I also fail to see how you plan dealing with gravel, leaves, plant matter, or even actually recovering any gold from any sand this might happen to suck up.

 

[RELICDUDE07]

No i did not over look....The size of a home garden hose bib....Outdoor faucets. (hose bibs). ❒ Faucet flow should not exceed 5.0 gpm x 60 mins=300 gallons per hour .The hose is the same size hose on the 500 gallon per hour bilge pump... This is from a building code --i cut the bottom of my pipe like this it may help a bit...

 

[Jason in Enid]

I'm done trying to explain physics to you. You are either ignoring the truth, or unable to understand it. GPM does NOT equal pressure.

Daydream all you want. IF you want to actually go out and search for placer gold, buy a book and get some real gear.

 

[RELICDUDE07]

If you turn a faucet wide open & it pours out 300 gallons an hour ----that is all you get like it or not.....I don't think you get it....I will hit the jack pot as always

 

[RELICDUDE07]

How Much Water Goes Through a Garden Hose Per Minute?
Home Maintenance & RepairSelecting the correct garden hose requires understanding how much water each ... a good garden hose as an essential tool for watering all types of plants in the home landscape. ... for your garden's hose bib produces about 40 psi (pounds per square inch)

 

[Goodyguy]

Saw this online & thought i may build 1- do you think it would have enough power to pick up small flake gold /pickers from the river bottom? I know its the same prox. as the larger 1s ......Thanks & let me know if anyone has made 1 like this before with any luck.... Relic

Good luck Relicdude07
Always a learning experience when inventing something.

Here is a detailed diagram for building a suction nozzle out of PVC that you may find helpful although you will have to scale it down for your small pump to be able to actually create suction at the intake. http://www.blackhillsprospectingclub.com/files/how_to/dredge_nozzle.pdf *Note the use of a washer to create additional velocity.

Looking forward to seeing what you come up with. I just don't see that small pump as being able to create enough of a siphon to provide sufficient lift to do what you have in mind.

GG~

 

[RELICDUDE07]

Thanks Goodguy .....That is smart the volume breakdown with the washer to create pressure..The V-pump is really cool & i think it may just work ,it shows it sucking sand in the video...Thats all i really need is to push this thing down in the sand,but have enough water flow around it not to clog .... The best part is just seeing it work & how it works by taken 1 part water in, & 10 parts water out.The way it has the gap at the bottom for the material uplift could be the key for a really great dredge ....

 

[Goodyguy]

Thanks Goodguy .....That is smart the volume breakdown with the washer to create pressure..The V-pump is really cool & i think it may just work ,it shows it sucking sand in the video...Thats all i really need is to push this thing down in the sand,but have enough water flow around it not to clog .... The best part is just seeing it work & how it works by taken 1 part water in, & 10 parts water out.The way it has the gap at the bottom for the material uplift could be the key for a really great dredge ....

Hope it works out for you.
Keep us posted. Nothing like seeing new fangled ways to capture gold

Cant wait to see a vid of it in action when it's done!

GG~

 

[RELICDUDE07]

I will do..I think if a drill a few 1/4 inch holes in the 3 inch pvc above the vpump so fresh water can enter the pipe it will work fine....I order & its in the mail

 

[werleibr]

The washer will not increase the pressure. It will acutally decrease the pressure. The washer Increases the Velocity of the water.

Q=V*A

Q is volumetric flow rate (gpm)
V is velocity of the water (ft/sec2)
A is the area of orifice (ft2)

Decrease A and V increases, because Q does not change.

Also P1+1/2*ρ*(V1)2 =P2+1/2*ρ*(V2)2

So From Above equation we see that V2 is Velocity After the washer. Since in Equation 1 we witnessed that Velocity must increase to keep same volumetric flow rate, the V2 is this velocity and it has increased. Now from equation 2, for it to work P2 must drop inorder to be equal because 1/2*ρ never changes as it is the same fluid.

http://www.globalsecurity.org/military/library/policy/army/fm/5-484/Ch4.htm Is a good site to learn about the air pump. when site loads search for air pump

http://www.1877eductors.com/eductor1.htm Website selling what you are trying to make from pvc.

http://www.1877eductors.com/pdf/Pumping_Liquids_V2010.pdf This give a cross-section of the eductor. You will notice it is tapered inside. Will also tell you what size you need by what your head is that you are supplying and how high you need to pump.


Hope this helps you out. I think the PDF will be benifical for you to use to help you make your type better if you don't want to buy one from them.

 

[RELICDUDE07]

Very good info & thanks a bunch. Found this on the Vpump web site---V-pump needs 30 psi to work...

 

[RELICDUDE07]

Got lucky today at a yard sale found this 12 volt pump for $10.00 It has 60 psi ....I tested & it works fine.. I will keep you guys posted when this V-pump thing comes in the mail-i can put it all together & try it close to my house....No gold around but i can try it in the bay & pump sand .If it works well i will upload a Video on the Poor Mans Dredge in action!

 

[mrs.oroblanco]

It might be a great idea - in theory, but, you do run into several problems.

One, its just not big enough to move anything substantial. 2-1/2"-3" would be minimum (imo - just because I own one, I guess).

Two - venturi action is just so much better.

Three - where the pipe goes into the pipe, you are pretty much blocking anything of any size from even coming through, and would be the perfect spot for anything that feels like clogging up the works. If you have ever used a dredge, you know how often rocks jam their way into the works.

4th - where/how would you mount it safely? (safely meaning it doesn't get wet).

5th - the electricity part is definitely a problem in some places - but not others.


Beth

 

[RELICDUDE07]

 

[RELICDUDE07]

http://alluvialpacific.com/shop/products-page/dredge/dredge-ap-76sm#!prettyPhoto[48]/0/