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micropedes1
05:07:16 Mon
Aug 17 2009

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Hydraulics on a dredge

Anybody here ever try to turn a dredge pump with a hydraulic pump?? 3x4 or larger pump

  
kurt_Blumberg
06:00:02 Mon
Aug 17 2009

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Re: Hydraulics on a dredge

My first thought is...lots of possible oil mess getting into the stream if it wasn't a real tight system. What do you imagine to be the advantage of using hydraulics? Sounds a bit cumbersome and complicated unless you are running a large dredge with other hydraulic components like lifting, positioning and leveling cylinders.

  
dredger
09:56:14 Mon
Aug 17 2009

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Re: Hydraulics on a dredge

If I remember correctly using an engine to drive a hydraulic pump, you loose around 20% of the horse power of the engine, and I am guessing you would loose a few more HP linking the Hydraulic motor the water pump,

However in certain situations having the motor and hydraulic pump on the surface, with extra long flexible hoses down a shaft and along a tunnel to a " sludge/water pump, or hydraulic digger,or cutter head wheel is worth it, ( no fumes in the tunnel.),

Also, i am thinking that hydraulic " motors " don't usually spin faster then about 100 rpm, or there abouts, resulting in loss of motoHP from trying to gear up to the pump. 2500rpm -3000 rpm, ??.

What is easy is to have a floating 6" or 10 " dredge where the dredge pump/s is connected to the petrol motor/s, same as usual, and where the hooker /air pump is run off a rubber belt, same as usual, you can fit a hydraulic pump similar to a power steer pump,off a car, or truck, or bigger still. hydraulic pump off a forklift to drive a small trommel mounted on the dredge, ??. or even have adj hydraulic legs under the ( smaller dredge, or a hydraulic " rocker mechanism " on the sluice, ????. hydraulic rock sweeper arm, ??.

Blar blar.

Ps, i would suggest using " enviro " hydraulic oil too, they make it, and it is environmentally friendly,




  
AK_Au_diver
08:37:25 Wed
Aug 19 2009

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Re: Hydraulics on a dredge


Yes, lots of applications use hydraulics to run a centrifugal water pump, I've seen it on 4x4 and larger pumps. I have not done it myself.

It's very helpful when you want the pump to be far away from the engine, such as underwater.


  
micropedes1
16:47:26 Thu
Aug 20 2009

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Re: Hydraulics on a dredge

That seems to be my problem. I've seen it done, but did not pay too much attention at the time as it did not directly apply to me. I am now trying to figure out how to combine some of my "obsolete" Kalifornia dredges into something near maximum allowable Alaska size. Another hover-dredge...I hope.

I have several (make that 3) Subaru engines mated to 4x5 Precision pumps. Horsepower should not be a problem. I would like to get them to serve double duty. Hydraulic power to the lift fans is easy. Its calculating the power needed to operate the dredge pump that has me scratching my head. I am looking for torque requirements for the pump operating under load. I need to figure hydraulic flow rate and pressure.

  
Jeff_D_C
22:07:14 Thu
Aug 20 2009

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Re: Hydraulics on a dredge

http://www.hydraulicsupermarket.com/technical9.html

There is some good info here. Scrole to the bottom and you can request there free info pac. We use a half horse hydraulic moter on a convoyer. Lots of power, something is going to break if it hangs up.

Jeff

  
AK_Au_diver
08:36:09 Fri
Aug 21 2009

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Re: Hydraulics on a dredge

You can look up the power curves for the Subaru engines at the RPM you run them while running the pump; that will give you an upper limit as to the HP required. One advantage of hydraulic powered pumps is that you can place them directly on the jet log (or directly on a mixing chamber that's attached to multiple jet logs); the point is, you can gain efficiency by not having a foot valve and putting the pump in the water. Just make sure to get the "marine shaft" or whatever they call it for the extra shaft seals.

I hope you are not planning on bringing those dredges up to Nome, it's pretty crowded here already and the gold is pretty thin, unless you are one of the four people with your own lease/claim.

What do you mean by "something near maximum allowable Alaska size"? That size varies from Zero to undefined. I know it's 4" in some places and 6" in others, I also know someone that has permits for 18".

  

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