5/7/2023 0 Comments Diy dredge nozzle![]() ![]() Most dredge builders would be far better off to buy a power jet or nozzle from an established dredge manufacturer. Suction nozzles and power jets are, without a doubt, the most problematic dredge parts for a home build dredger to construct. There is a reason why all established dredge manufactures only use pumps specifically designed to use on eductor dredges. The only place a dredge can be seen with a below spec water pump on them is on Trademe in New Zealand. All the dredges any potential customers have previously seen would have been viewed in catalogues and on the Internet, and all would have dredge pumps used on them. ![]() Using a Chinese high-volume water pump on a dredge would immediately be seen by most potential customers as a design compromise and this is probably why they are asking for pumps such as the Keene pumps. The issue of dredge pumps has been refered to previously in other posts on this forum and I won't add any more except to emphasize, for any other members building a dredge, that the selection of a pump designed specifically for eductor dredging is essential on any eductor dredge (even recreational dredges) and the pump is probably the most important individual component of an eductor dredge. I can't imagine how these Chinese pumps could even come close to doing the job required of a dredge pump. Eductor dredge pumps move water at high volume COMBINED WITH high pressure. These Chinese pumps are designed for a very different job to the pumps designed specifically for eductor dredging. I had a look at the pumps on your web site and the pump on your 4-inch dredge is simply a Chinese knock-off of a standard Honda water pump which is designed to move water in volume. Using a suitable pump is so obvious and well known to experienced dredgers that its importance is not always emphasised … its another reason why production dredges should only be designed and built by experienced dredgers! Even a perfectly designed power jet or suction nozzle would be near useless if an unsuitable pump, such as a trash pump, is used. Only dredge pumps can produce a high volume of water at high pressure. A pump designed specifically for eductor/suction dredges ‘must’ be used. Ī point that’s extremely important to consider when evaluating power jets is the necessity of using a suitable pump. The following is what has been previously posted in this forum about dredge pumps. If a pump is used that is not specifically designed for dredging then you are creating an unnecessary difficulty right from the get go. The pump is the heart of a gold dredge, and the pump used on any dredge should be one designed specifically for gold dredging. So, if that's the way you have to go then do it (its always better to do 'something' than give up and go home. ![]() I can understand you might have difficulty sourcing correct equipment in your country. ![]() I would never personally use the type of pump you have, on a gold dredge! But. With a 6" you can do a lot of prospecting and can also do some production dredging immediately after the prospecting phase has ended. If you are going to dredge a waterway of a fair size where the overburden above bedrock is more than a few feet deep, you would be better to make a 6" dredge. a 6" dredge is a better choice if the waterway to be prospected is big enough to allow it to be maneuverable. Even a 5" dredge has its limitations for prospecting. If a professional dredger wants to prospect an area of interest by sinking numerous prospecting holes, and who needs a dredge small enough to be portable, he will chose a 5" over a 4" every time. And, if the water depth from the surface to the top of the river gravel is more than a meter, most 4" dredges won't be of much use. Where the overburden above bedrock is more than a few feet deep, as it is in most auriferous waterways, these dredges won't get a prospecting hole down as far as bedrock. They can be used to sink prospecting holes, however the holes would not be deep enough in most rivers to prove anything conclusive. they would only be of use to a professional in rapids to clean out exposed crevices with little overburden to remove. I don't know what you have in mind to dredge but as you are in Liberia my guess would be that you want to do some commercial-scale serious profit-orientated dredging! Here in Australasia a dredge this small would rarely be used by serious dredgers. A four inch dredge is essentially a recreational dredge and if you build a dredge this small you will be extremely restricted as to what you will be able to do. ( Building a small dredge ).īut before you start, and go to the trouble of building a dredge, I suggest you first give some consideration to the size of dredge you should be building. To answer your question in detail you can find a previous thread at the following link. ![]()
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