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Location of jet?


Steel Pan

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I heard that the jet should be abouit 2 ft. from the crash box.

That doesn't work, need more distance in order to form a water column

that creates the suction.

So, how far from the crashbox does the jet need to be in order for

the jet to work properly? :idunno:

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Steel Pan

Every jet tube or nozzle Ive ever seen, the venturi jet has always been about 20-25 % down from the entrance of the jet tube/nozzle regardless of tube or hose length. AzNuggetBob

Edited by AzNuggetBob
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Say you have a hose 20 ft long.

You would place the power jet at aprox

5 ft. from the the buisness end?

Or, from the crash box? :89:

I cut the end off a suction nozzle and put that at the end of a 3ft

length of hose. Installed the suction nozzle at the other end and

ran a 16ft length to the crash box. (see pic of "assistant" below)

Originally I had the two hoses switched, the 3 ft went to the crash

box. That's what I was told to do but it didn't work. boorb

Now, I can stand and hold the nozzle with the 3ft hose reaching the

material for me, no bending over. ( again, see pic of "assistant")

I see that as an unexpected bonus. :brows:

Don't like bendin' over. :olddude:

What I'm goin' for, is to hold nothing but hose and have the suction

nozzle further up line and closer to the crash box.

Just like the big boys. :4chsmu1:

Power Jet, Suction Nozzle, and "assistant" are below.

post-22425-0-75834000-1398368196_thumb.j

post-22425-0-05912800-1398368292.jpg

post-22425-0-38309800-1398368411_thumb.j

Edited by Steel Pan
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Steel Pan

I see what your trying to do but its a matter of psychics. the higher you hold the jet nozzle out of the water the less suction you'll have. Its like putting a high banker up on a bank rather than lower down in the creek. the raise is going to kill suction..AzNuggetBob

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The only thing I can think of to solve the problem is more pump power and or multi-jet nozzle. AzNuggetBob

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Ya, I figured out about the nozzle being higher above the water would, and does,

cause suction loss.

I'm lookin' at layin' the nozzle/jet in the stream and usin' just the end of the hose

to move about and suck up material.

We're kinda dancin' around my delema, but gettin' some good info out. :brows:

When some one sets up a dredge and sluice, how long are the hose sections

to and from the jet, that's really what I'm gettin' at? :idunno:

Don't know why I couldn't get to the point, right out the gate. :nutty:

I think they call it "Drain Bammage". :4chsmu1:

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I just realized, there are a lot of views of this thread. :89:

"Location of jet"

I wonder how many people thought it was about finding the lost Malasian flight.

Well, as soon as I get this system operating the way I like, I'll look for that dang plane. :old:

My new bumper sticker,...

"Dredge the Oceans" :brows:

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I just realized, there are a lot of views of this thread. :89:

"Location of jet"

I wonder how many people thought it was about finding the lost Malasian flight.

Well, as soon as I get this system operating the way I like, I'll look for that dang plane. :old:

My new bumper sticker,...

"Dredge the Oceans" :brows:

Went I first saw the title of this topic, I was going to move it to the ODDS N ENDS section, but then I read your topic!! :4chsmu1:

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My 4" and also 2 1/2" and 3" dredges have a 20' suction hose, 2" dredges usually have a 15' hose.

" how long are the hose sections

to and from the jet, that's really what I'm gettin' at?"

20ft each?

Went I first saw the title of this topic, I was going to move it to the ODDS N ENDS section, but then I read your topic!! :4chsmu1:

Life is so confusing sometimes,... :mornincoffee:

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The high pressure hose is only about 5' to 6' long for a jet (your first picture), or only long enough to go from the pump to the jet (it could be longer, but no need), the suctions hoses are the length I mentioned above.

For a suction nozzle, (your second and third pictures) the high pressure hose would be the same length as the suction hose.

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My pressure line is actually about 600 ft long.

(since it is a gravitational operating system)

It's the suction hose length to the jet and the hose length

from the jet to the crash box that are in question.

That would be 2 dif hoses. :brows:

1. supply line

2. line to sluice from nozzle/jet

3. suction hose

Length of hoses 2 and 3 are in question.

Suction.bmp

Edited by Steel Pan
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It may be better in the middle so to speak? (jet tube) never tried it? equal suction and pressure pushing? AzNuggetBob

Edited by AzNuggetBob
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In this picture...

post-22425-0-38309800-1398368411.jpg

I don't see a "jet" like in your first picture shown above, I do see your 1 1/2" (?) pressure hose going to a Tee, and then to your suction nozzle, a 3"(?) suction hose from your suction nozzle to your crashbox/sluice, and you have about 2' of 3" hose on the nozzle end of your suction nozzle, is this the hose in question when you said..."3. suction hose"..., if so this hose just slows the material down, IMHO, because the friction inside the hose, I would not have the hose on the end of the nozzle, if you want to use the suction nozzle without bending over I would add a long metal handle to the suction nozzle so you can get the nozzle end into the material.

I would keep your hose to your sluice at 20' or less, the shorter your hose the better your results will be, especially if there any lift/rise to your sluice..

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After posting the above, I also think you should try putting the suction nozzle at your sluice with a short piece of hose, like a jet would be placed, have 20' or less of suction hose off the nozzle into the stream.

If you have another suction nozzle, or a jet you can use one in the middle of the hose as well, this setup is termed as a "midjet" and will greatly increase your performance.

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Yes, number 3.

What I'm tryin' to do is use the suction nozzle in place of a jet.

Since I've never been around a dredge using a jet, I'm perplexed

as to where you would normally place the jet in the line. :idunno:

The sluice is actually below the water level of the pool I'm dredging.

Edited by Steel Pan
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Something else Steel Pan a jet nozzle looses pressure with that 180 bend plain and simple. a hard right angle 90 is even worse. a jet tube with a long hose is better. Hey this is fun. AzNuggetBob

Edited by AzNuggetBob
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Something else Steel Pan a jet nozzle looses pressure with that 180 bend plain and simple. a right angle 90 is even worse. a jet tube with a long hose is better. AzNuggetBob

Yup, that's another thing.

After i get the hose length figured out I'll cut and reweld the supply to a straight pipe.

After posting the above, I also think you should try putting the suction nozzle at your sluice with a short piece of hose, like a jet would be placed, have 20' or less of suction hose off the nozzle into the stream.

If you have another suction nozzle, or a jet you can use one in the middle of the hose as well, this setup is termed as a "midjet" and will greatly increase your performance.

I tried the nozzle at aprox 3 ft from the crash box. It didn't work worth a squat.

Apparently I didn't have a good water column in the hose to promote the suction. :th:

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Here's a picture of my 4" dredge, you can see the "jet" which is attached to the "flare" that is attached to the sluice, coming into the jet is the high pressure hose from the pump and the 4" suction hose with a metal tip at this suction end attached to the jet.

As I described above you can use the suction nozzle setup the same and it will work if you have the correct high pressure coming into the suction nozzle, it will not make much difference where the suction nozzle is located, as long as the high pressure input is correct to create suction.

MYNEWTOY.jpg

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O.K., it would appear that it is the combo of the jet

and the flare that makes the system work.

Sooooo, if I put the nozzle back to the position of

3 ft from the sluice I still need the flare for the system to work.

Right? :89:

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No, you stated you have a crashbox, which will let the material slow down before entering the sluice, basically a flare replaces the crashbox, it lets the material spread out and thus slow down before entering the sluice.

the way you have it setup in the picture above it should work or with the suction nozzle at the carshbox, it should work, I'm thinking you not getting enough pressure into the suction nozzle.

How much fall do you have in your 300' of pressure line?

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It's a 600 ft pressure line. 400 at 3" and 200 at 2".

I reduce again to 1 1/2" at the manifold.

I figure around 115 ft of drop and produce aprox

57 psi. Aprox 2' of fall for every 1 psi.

Marc Keene said I only need 30 psi to run the nozzle.

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If you're getting 57 PSI you shouldn't have an issue no matter where you use the suction nozzle, and I agree that even with 30 PSI you should get decent suction, the only other factor would be volume.

You may want to put a pressure gauge in your system just to see what pressure you're getting while static and running, if you have 50+ PSI static pressure, and it drops dramatically while running, the issue maybe volume and not pressure.

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I'm glad you brought that up.

I do want to put a pressure gauge on the line

out of curiosity if for nuthin else.

A couple of years ago I was using a 1 1/2" nozzle

and running off a 2" pressure line.

When I changed to the 3" nozzle, I didn't have the volume

and that's when I went to the 3" main pressure line.

If I did my math right, I have increased my volume seven fold.

The system works just fine as it is, I'm just trying to figure

a way where I don't have to handle the frickin' nozzle, and

two (2) hoses all the time. :grr01:

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