How a Suction Gold Dredge Works. Discussing suction efficiency.

[@declanomeara446]

Actually, I watched it again, and ,and Man, you should be teaching, you have a great informative manner that makes thing a lot easier to understand.

[@UtmostOutdoors]

Thanks for the positive encouragement! Much appreciated!

[@orpaillagetoutsimplement2462]

You have embarked on a long but very interesting adventure! Well done to you man! You have our full support! 🙏

[@UtmostOutdoors]

Thanks a ton!

[@chrisrudy1969]

Thanks for the video. I work on my own custom 16" gold dredge up in Nome, Alaska. I make Venturi pumps (or jet logs, or eductors, as some call it) for myself and others. One thing people need to understand is that these suction devices are simply another pump that is powered by water from a centrifugal pump. They can never surpass the output of the centrifugal pump. Typically they are around 80% efficient. So if your centrifugal pump is producing 1500 gal/min @ 60 psi, then your Venturi pump will be roughly 1200 gal/min @ 48 psi. I know you are familiar with the Bernoulli equation. The goal is to produce a Venturi diameter that will bring your input water pressure as close to zero psi without causing cavitation or dead heading. Doing this removes the trial and error of jet sizing. The cross sectional area has to match so you have to sum up the CSA of all the jets you want. Cheers!

[@scottthomas5103]

That was awesome! Best video of this on the internet!!!

[@UtmostOutdoors]

Really?? Thanks a lot, I'm glad you liked it!

[@declanomeara446]

Very interesting vid, I learned a lot from you, thanks.

[@djanes7210]

This is awesome. For subsurface fines try baffling the box to create dead zones

[@Graham_OntheGoldagain]

Fantastic Im looking forward to seeing these tests 👍

[@randydixon9512]

I was looking into gravity dredging and realized most people used to powered systems (including me) confuse water pressure with water velocity, because you increase velocity with increase pressure in those systems, but the Venturi effect is dependent on water velocity, not pressure. A long way to say that I think you need to do your own experiment with the sizing of the inductor nozzles or other stepping down of piping and not rely on what is accepted, because high volume can get you high velocity but not at the same sizing and steps as high pressure will and the research is on high pressure systems.

[@timberripper]

Ive got the goldibox dredge i love the thing

[@mrkus-nc7od]

Hi ! 😊 I am working on getting gravity vacuum going , 1 - 1/2 100 feet - I hope it really sucks 😅 all fine gold so nozzle of hose has 1/4 inch screen - to help avoid jams - . When are you going Gold hunting ? Even just some Gold & Gem Stalking while avoiding Aussie critters be a Adventure 😊 Stay safe -,see you at your next video.

[@randydixon9512]

You can use 4 inch corrugated pipe for the cheapest gravity dredge hose. The corrugation will even process a lot of the dirt. Simple siphoning is how I've always seen it used but I'd like to see a system using a jet or suction hose on the other end. In theory it is simple.

[@illernpiller]

Would be really interestes in the infinity. And just as you said about keenes testing I agree with you. You basically don't want a high pressure pump, you want volume for an infinity.

[@UtmostOutdoors]

I suspect that the input pressure needs to be higher for a surface dredge, and the higher you need to lift the higher the pressure, but a subsurface dredge may no need as much pressure. I'm curious to find out for sure if an infinity jet is better or not. We will find out with testing soon enough! :)

[@Shaboynga]

Man I would love to see you do a season on Bering sea gold.

[@UtmostOutdoors]

Me too! :)

[@SRTKOVA]

I’ll send this to my girl

[@catsailor23]

As a Firefighter. The pumps have ratings on them. In a FF truck it has to do however rating is a a 10’ draft. I think? Is 80% of that other wise it fails. And that would be if there are no restrictions ie smaller suction and discharge pipes

[@driverjamescopeland]

Join the GPAA (if they're still around). LOADS of resources for beginning and experienced prospectors alike. I joined when I was in my early teens. Learned a ton of stuff through their literature, videos, etc..

[@Leftoverau]

If you're going to use a 3d printer you could probably make an infinity or couple jet. It might even turn out stronger than the jet log type. A subie with infinity jet would be even more efficient if I remember correctly.

[@UtmostOutdoors]

I guess we'll find out for sure!

[@mathewofficer]

Your videos are interesting. Whats your background chap? are you engineer or some sort of tradesmen?

[@UtmostOutdoors]

Thanks. I'm not really sure what my background is... I guess I'm mostly a carpenter with an interest in engineering.

[@jasonaucolorado5111]

To calculate the GPH/GPM needed for a waterfall or stream, multiply the width in feet by 30 GPH. A 6 inch dredge typically requires a pump that delivers 500-600 gallons per minute (GPH). However, according to Treasure Net, a 6 inch dredge may require 1600-2000 GPH to use the Gold Hog Matting properly. I really want this to work 2" electric dreadge would be aweaome

[@mohammednovalija]

Well that was useful. Multiply the width of WHAT ? So you need a pump of about 500 GPH but you actually need 1600 GPH to run properly. I'm coming over to run your tailings - Money for Nothing.

[@DonaldRand-qc6cd]

I was very informative fantastic. I have a solar generator that I bought from the Internet and I’m hoping to use all electric in my siphoning of the water for water jet system intriguing I will look up that GPA I seen in the comments goes over that in details as well, but I believe quietness will get you less Irritated people around you while you’re judging these quiet rivers I think maybe I’ll have a better chance. Hopefully this is just not a fantasy but reality thank you for your information.

[@randydixon9512]

If you are going to use bilge pumps or low powered pumps how about combining a suction nozzle along with a jet induction? Or maybe instead of a double inductor you use two or three inductors in a series on the suction line spaced a few feet apart, either with separate pump or with some type of manifold.

[@UtmostOutdoors]

It would be interesting to see if it was more efficient to run a single jet one after the other, or a double jet at one spot.

[@mohammednovalija]

WOW - You went from kindergarten to Rocket Science real quick. 5 minutes gone and I'm still watching , hoping something useful turns up.

[@StinkyFeet-i3b]

You Aussies…😂😂😂. I guess utmost is an Aussie now too.

[@mohammednovalija]

@@StinkyFeet-i3b He's not even close to being an Aussie. That may or may not be a good thing

[@StinkyFeet-i3b]

In Melbourne's dusty plains, where gum trees sway, Lived Mo the Tinkerer, where gold holds its sway. With sluice in his grip, and dreams in his heart, He searched for treasures, never to depart. Through creeks and valleys, he'd wander alone, In search of gleaming nuggets, by nature's throne. With grit in his eyes and hope in his soul, He'd sift through the earth, to reach his gold goal. Though hardships and toils marked his weary trail, Mo's spirit remained, like a ship's steadfast sail. For in every shimmering glint that he'd find, Lay stories of courage, of trials intertwined. So here's to Mo the Tinkerer, of Melbourne's land, A prospector bold, with sluice in his hand. In pursuit of riches, yet rich in his tale, In the heart of Australia, his legend prevails.

[@mohammednovalija]

@@StinkyFeet-i3b 10 out of 10 for effort. And another 10 out of 10 for being GAY. Stop playing Computer Games and get out there and get your hands dirty.

[@StinkyFeet-i3b]

@@mohammednovalija fair enough. Before then, here is another poem I’ve been working on. Mo the Tinkerer, from Melbourne's gleam, In the land of gold, he's found his dream. With beers in hand, he pans the streams, No pushups for him, just golden dreams.

[@fittergrips2010]

Make sure you have a pressure pump ( enclosed impeller). electric gold dredge ??

[@UtmostOutdoors]

It might be possible... If it doesn't scale well, the test data can be extrapolated into a larger gas powered design.

[@kevinpeter9951]

Have 2.5in dredge and having problem with suction system declines

[@needlenorth9847]

Now that you built he best sluice ever, are you going to now build the best dredge ever ?

[@UtmostOutdoors]

I highly doubt it. But I would like to work on an idea for a 6" prototype for someone to try out in Nome... I'm likely years away from anything really good when it comes to dredging.

[@randydixon9512]

Also, once you learn it, show some of your Fusion 360 tips. I've tried several times to learn it but unless someone nails my ass to the chair and threatens me, I don't think I'm going to get it.

[@UtmostOutdoors]

It's tricky. I'm not at all a fan of the learning process so far. But I guess it helps that I have a goal in mind to motivate me to put in the time. I'm hoping that it's true you can learn the basics of most things in just 20 hours...

[@AddeStensfors]

Hi, we need to talk. I am building dredges for 30 years now and I have an answer to most of your questions. My dredges are lightest in the wold, ( 3" weights 25 pounds) and most efficient ones as well.

[@UtmostOutdoors]

Sounds interesting. Send me a video or some pictures.

[@AddeStensfors]

@@UtmostOutdoors Where to? Are you on FB?

[@UtmostOutdoors]

@user-yy6kc2lb4k my channel email is [e-mail]

[@goldentroutprospecting1821]

kzbin.info/www/bejne/b3eVh5Wba5uJY5o I don't know if you have seent this design yet. But I thought this was a neat idea and it's kind of a bit of both, suction and jet. I'd like to see one with a 4000 pump to see if it will move a good amount of material. Buy I am still shoveling snow and slush so could be a while before I get started. Or if you have any thoughts on this design before I start.

[@UtmostOutdoors]

Thanks for the link. That guy came up with a very creative way to channeling the water! I've tried drilling a bunch of holes around an ABS pipe then using a larger T fitting to fill the water around the pipe so it sprays in all those holes, it worked well, but I like the way he centers the pipe inside the other pipe and bent the ends out to create a whole ring of jets... Looks like it works fairly well with a small bilge pump, just imagine the possibilities with a 3D printer!

[@goldentroutprospecting1821]

You have me worried. It sounds like something else will be coming down the pipeline that I will want to buy!

[@MacF.]

If you put in the following to chatchpt it will calculate it out "Using Bernoullis venturi principle. Calculate the flow rates in the following situation. 2in hose lifting 12" above the water where a 2in nozzle is outputting 4000gph. Use GPH" ≈952.74GPH Doesnt really make sense since its less than the pump output, chatgpt is wrong frequently but the calculations are interesting to see Heres the jist on Bernoulli fro chpt "This means that for a given flow rate at the inlet (determined by the pump), the flow rate at the outlet (throat) will be the same, regardless of the nozzle size. However, the velocity at the throat will be inversely proportional to the area of the throat. So, in theory, the smallest nozzle size will give the highest velocity at the throat, but the flow rate will remain the same regardless of the nozzle size. However, in practice, there are limitations such as frictional losses and practical constraints that may affect the actual flow rate." I say just go for the biggest nozzle and upsize the hose on the pump to reduce friction losses. Btw you are going to love the 3d printer. If you want any help designing models just let me know.

[@UtmostOutdoors]

I asked GPT some specific questions about how much flow rate is going through a suction dredge sluice box and it had no good answers. It's pretty impressive at some things, but it definitely has some work to do before it takes over the world. (thankfully) Also, I'll get some measurements of an impeller to swap onto the bilge pump I got to test with, and if you want to try your hand at making an impeller for me to test out, I could print one off and see how your design works out. Otherwise, that's this weeks project is to figure out how to get started on that impeller... Fusion 360 is hard!

[@MacF.]

@@UtmostOutdoors Yea sure you can send over the specs. What is your email? Fusion is a pain to learn but really powerful. Probably want to use parameters for the impeller to easily change the number of blades, angles etc. The design history is your friend there.

[@UtmostOutdoors]

@MacF. [e-mail] That's a good idea. Could also swap out 3 blades for 5 blades for another test. I'll test out my shaft size I'm a print then send you the specs.