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DanBrunner
04:41:40 Thu
Aug 13 2009

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Dredging Question from a tenderfoot... :}

Hey guys, I'm completely new to dredging (haven't done it yet), so I tried practicing here at home by using a pool with fresh water in it as a test... Anyway, I have a 3" dredge with a suction nozzle as opposed to a jet. The problem I'm having is that I can't seem to get the venturi effect to kick in. I get water to flow through the lines, up to the highbanker, but I'm not getting any suction at the nozzle. Is there a trick to getting the full suction going?

  
Walt_Anchorage
06:13:11 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

Fill your pool with marbles and try to suck them up. When you have lost all your marbles you are ready to go mining.

Sorry I couldn't help myself.



---
MY Web Sites:
rubyalaska.info
alaskagoldrush.info
swiftcreekmine.com
 
 
dredger
09:40:07 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

Hey Dan,

Sounds like you have a problem, so I suggest you post some pics and or all info on motor / pump/ jet orifice ect sizes, how high you are trying to lift the water to sluice ect, ect, more info the better,

It should have good suction, ( 3" suction nozzle ), ??. most probably some thing simple, ?? restricted foot valve, blockage in the orifice, ??.

dredger.

  
colo_nuggets
13:26:15 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

Did you buy this dredge new or used, what brand. They didn't weld over the nozzle and forget to cut out for the pressure hose did they?

  
DanBrunner
14:26:38 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

I'm getting plenty of water flow, but it seems to back flow down to the end of the nozzle instead of through the hose to the highbanker.

  
rlh1946
14:45:02 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

sounds like you got a plug somewhere.

  
colo_nuggets
17:37:06 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

Disconnect that hose and slide a pry bar all the way thru. If its clear try filling the suction hose up with water. Did you build this? Don't be embarrassed we need the info to help ya.

  
Brian_Berkhahn
19:44:05 Thu
Aug 13 2009

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Re: Dredging Question from a tenderfoot... :}

Sounds like you have a rock jammed in the nozzle, water wil flow back out the front if you do.

Brian

  
DanBrunner
03:44:31 Fri
Aug 14 2009

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Re: Dredging Question from a tenderfoot... :}

Thanks for all the info guys. It appears I must have had a clog somewhere. Unfortunately, I never got a chance to confirm this. This is the nozzle that comes as part of the 3"dredge kit for the G1 highbanker. I don't blame the equipment yet. I'm sure I screwed something up on my end. I've since tore everything down to take it up in the hills this weekend. I'm going to double check all the lines for obstructions before getting everything going. I'll let you all know how it goes.

  
eightymesh
13:12:20 Fri
Aug 14 2009

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Re: Dredging Question from a tenderfoot... :}

my dry land dredge, running a 2" pacer style pump and 2" suction nozzle will lift material about 4 ft from hole botton to the sluice, a trash pump wont do that... yup we need some pics of your set up

  
DanBrunner
17:19:28 Sun
Aug 16 2009

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Re: Dredging Question from a tenderfoot... :}

Good news.. Got it all working! I talked to a couple of dredging friends here and they gave me a few tips to trouble shoot it. First tip was to see how far I could shoot the water out of my pressure hose before hookint it up to the nozzle. My line is a 2" line choked down to a 1" for the nozzle intake. We fired up the pump and was able to shoot a rainbow about 30 to 40 feet. All good there... Next test was to hook up the pressure hose (ONLY) to the nozzle and see how far I could shoot water through the nozzle. 30 feet again. All good. SO I hooked everything up again, sunk it in the water and bam... Suction. So all in all, I'm sure something had previously gotten lodged in the spray nozzle which was restricting water flow. Now I just need to get better at throwing stones instead of getting them lodged in my dredge line... It seems like for what I'm doing (long arming) it makes more sense to run it as a traditional highbanker, using a shovel at first to get the material into the unit, but then switch over to the dredge nozzle once I get closer to bedrock. Anyway, all in all it was a great weekend. I didn't dredge much, just enough to figure out how to get the suction to work.. We did process 42 buckets of material using picks and shovels. I posted pictures in the highbanker thread. Thanks again for all your help guys. Best of luck.

-dan

  
dredger
22:06:20 Sun
Aug 16 2009

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Re: Dredging Question from a tenderfoot... :}

Good point there , eightymesh,

"a trash pump wont do that."'.

I suggest that new guys should note that "supplying enough water to run a hy-banker " can be done with a trash pump or small fire fighting pump,

Please note, this can be a excellent combo for just shoveling straight in,or slowly processing buckets of screened materials because the water volume suits this type of hy-banker recovery systems , and course to very fine gold,:smile: ,

How ever attaching a 3" suction nozzle presents problems to the above trash pump set up,
Not enough suction, so the solution is to up grade the trash pump to a more specific 3" suction nozzle motor pump,

Problem then is having a good 3' suction nozzle with good to excellent suction that moves lots of material means that there is alot more velocity and volume of water running through your hy-banker,

So what I am suggesting for the new guys is if you go for a suction nozzle especially a 3" and new high pressure/volume pump, he must be aware that you will have to " re tune ' or reset the the sluice angles and allow for allot more water to be running to your Hy-banker, Please note, we are getting good reports on Hy-banker with dredge nozzle, and I agree with eighty mesh that a 2" dredge nozzle rather then a 3" nozzle would be more suitable to Hy-banker width, ,

Another point of interest or course of " poor " pump performance is water lift , from the foot valve " up " to the inlet of the pump, My next small pump will be mounted in a sump ,and placed in the water,


Easy self priming.??. ( just an idea, ), would need to be tied off, so it does not vibrate into deeper water,

Also please note, drawing shows ( short, extra ), extension on muffle to direct " sound " and exhaust fumes up, and not echo along river banks,

dredger,

Ps, nice gold Dan,:smile:.

  

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