Sluice design from pvc pipe

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Post  maka on Tue Jul 12, 2011 8:24 pm

Hi, guys toying with an idea about a sluice made from large pvc pipe, Maybe 200mm diameter. My thought is that i can glue ribbed matting in it easily, its light weight, and you can join sections together making it ideal to carry on long walks. 3x600mm sections, so an 1800 mm sluice will be only 600mm long.
I intend to split the pipe longways and glue the matting in perpendicular to the water flow.
So it would just be a half pipe section at 600mm x3.So i can make it 600mm , 1200mm, or 1800mm depending on slope water flow and gravel size used.
My thought is that being concave it may not work that well. But gold should go to the centre being heaviest???
I am thinking about running a bilge pump to it with a motor bike battery and a solar panel for constant charging.
This will have no Hungarian riffles in it, just purely for fine gold.
Any thoughts appreciated. or feedback if you have toyed with this idea,
Cheers.
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Post  Guest on Tue Jul 12, 2011 9:27 pm

yes it has been done and ill get you some pics of the banjos James101 and others made a few years ago Very Happy

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Post  Guest on Tue Jul 12, 2011 9:38 pm

In the past we have made and used the PVC pipe Banjo’s, this is what I found. First off the PVC was easy to work with you could heat it and shape it as you wish. But the PVC weighed far more than a aluminium square unit of the same size. The matting may give you trouble if it is glued at clean up time, the Hungarian riffle is designed for the larger sized gold and should be incorporated in your riffle design. The gold dose go to the centre and the design dose reduce the amount of concentrate at clean up time a point which is overlook in most designs.
For a river sluice I feel the PVC pipe would be of a great advantage but the idea with the Bilge pump is in question I feel the little pump will not have the grunt to drive the unit. A small petrol pump would be a far better choice and the weight would be about the same as the bilge pump and battery. Hope that helps.
Cheers
James 101


Sluice design from pvc pipe RoundbanjoSmall

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Last edited by James 101 on Tue Jul 12, 2011 10:09 pm; edited 1 time in total

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Post  Guest on Tue Jul 12, 2011 9:42 pm

Thanks James101 saves be lookin for that pic cheers cheers

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Post  Guest on Tue Jul 12, 2011 9:43 pm

It was in a pipe banjo the 'original' catch tray was developed Twisted Evil

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Post  Guest on Tue Jul 12, 2011 9:50 pm

I did hear that Very Happy

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Post  Guest on Tue Jul 12, 2011 10:08 pm

With no riffles the mat in your Poly sluice will easily be chocked with other fine's, My guess on the size mentioned you would have your fine gold flowing out the end in a couple of good shovels worth of dirt! You need riffles, simple removable ones with screw/bolt from underneath, pulling down tightly on your carpet will work.
Lots of ways to fix the problem, overcoming weight will be the biggest issue. I cant see why you can't use a good boat bilge pump 1400 gallons an hour should do the job on that size sluice, Just need to adjust the slope to compensate!

Cheers~Chris.

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Post  Guest on Tue Jul 12, 2011 10:11 pm

someday wrote:With no riffles the mat in your Poly sluice will easily be chocked with other fine's, My guess on the size mentioned you would have your fine gold flowing out the end in a couple of good shovels worth of dirt! You need riffles, simple removable ones with screw/bolt from underneath, pulling down tightly on your carpet will work.
Lots of ways to fix the problem, overcoming weight will be the biggest issue. I cant see why you can't use a good boat bilge pump 1400 gallons an hour should do the job on that size sluice, Just need to adjust the slope to compensate!

Cheers~Chris.
its ok when you are down at the waters edge but if you need to lift the water they just dont work Very Happy

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Post  Guest on Tue Jul 12, 2011 10:22 pm

If there properly submersed they should lift with little lose at 12 feet. I know it doesn't take much to be 12 feet above a water course! Fine see if I care, use your petrol driven pumps.
lol! lol! lol!
Cheers~Chris.

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Post  Guest on Tue Jul 12, 2011 10:28 pm

weight of pump +weight of car battery = ? a small 4 stroke is much more adaptable in my eyes Very Happy and you only need it ticking over --very quiet Very Happy but hey if ya want 12v go for it who am I to stop ya lol!

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Post  Guest on Tue Jul 12, 2011 10:40 pm

Never said I wanted either! lol! Having said that, My resent metal detecting decision on trying to find fine gold leads, is putting me back to re thinking the sluice idea
"And how to pump enough water" to operate a sizable sluice! Isn't life supposed to get easier as we get older?
I missed something somewhere!

Cheers~Chris.

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Post  Guest on Tue Jul 12, 2011 10:43 pm

lol! lol! lol!

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Post  Billy on Tue Jul 12, 2011 10:48 pm

someday wrote:Never said I wanted either! lol! Having said that, My resent metal detecting decision on trying to find fine gold leads, is putting me back to re thinking the sluice idea
"And how to pump enough water" to operate a sizable sluice! Isn't life supposed to get easier as we get older?
I missed something somewhere!

Cheers~Chris.

Life is like a roll of toilet paper. The shorter it gets the quicker it goes! lol!
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Post  Guest on Tue Jul 12, 2011 11:05 pm

That's a bummer!

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Post  Guest on Wed Jul 13, 2011 1:26 pm

lol! lol! lol! lol! lol! affraid

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Post  maka on Wed Jul 13, 2011 7:10 pm

I did buy a 2000GPH bilge. Hopefully it will work. the only reason i want an electric is to be very quiet where i am. A pump running even a 4 stroke will look and sound less environmentally friendly if people come along to complain about worms living under the rocks i am digging up.
And i have worked in industry all my life and sick of generators, etc running and i do want tranquility when i am out in the scrub.
Cheers for the pics, looks like a great design, I do have a wooden one that i could modify, but it will rot eventually..
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Post  madmaverick on Wed Jul 13, 2011 7:23 pm

that pump should work as I have one that i use for my sluice and it works well with the spray bars I made up

happy hunting
Steve and Lea
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Post  Guest on Wed Oct 12, 2011 5:36 pm

I would keep the jetting holes to 1.5 mil cheers cheers

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